专题16 阅读理解说明类-三年（2019-2021）高考真题英语分项汇编

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三年（2019-2021）高考真题英语分项汇编
专题16 阅读理解说明类
一、2021年高考真题
1.【2021新高考1卷 C篇】
When the explorers first set foot upon the continent of North America, the skies and lands were alive with an astonishing variety of wildlife. Native Americans have taken care of these precious natural resourses wisely. Unfortunately, it took the explorers and the settlers who followed only a few decades to decimate a large part of these resources. Millions of waterfowl（水禽）were killed at the hands of market hunters and a handful of overly ambitious sportsmen. Millions of acres of wetlands were dried to feed and house the ever-increasing populations, greatly reducing waterfowl habitat（栖息地）.
In 1934, with the passage of the Migratory Bird Hunting Stamp Act (Act), an increasingly concerned nation took firm action to stop the destruction of migratory（迁徙的）waterfowl and the wetlands so vital to their survival. Under this Act, all waterfowl hunters 16 years of age and over must annually purchase and carry a Federal Duck Stamp. The very first Federal Duck Stamp was designed by J.N. "Ding" Darling, a political cartoonist from Des Moines, lowa, who at that time was appointed by President Franklin Roosevelt as Director of the Bureau of Biological Survey. Hunters willingly pay the stamp price to ensure the survival of our natural resources.
About 98 cents of every duck stamp dollar goes directly into the Migratory Bird Conservation Fund to purchase wetlands and wildlife habitat for inclusion into the National Wildlife Refuge System—a fact that ensures this land will be protected and available for all generations to come. Since 1934, better than half a billion dollars has gone into that Fund to purchase more than 5 million acres of habitat. Little wonder the Federal Duck Stamp Program has been called one of the most successful conservation programs ever initiated.
1.What was a cause of the waterfowl population decline in North America?
A.Loss of wetlands. B.Popularity of water sports.
C.Pollution of rivers. D.Arrival of other wild animals.

2.What does the underlined word "decimate" mean in the first paragraph?
A.Acquire. B.Export. C.Destroy. D.Distribute.

3.What is a direct result of the Act passed in 1934?
A.The stamp price has gone down.
B.The migratory birds have flown away.
C.The hunters have stopped hunting.
D.The government has collected money.

4.Which of the following is a suitable title for the text?
A.The Federal Duck Stamp Story
B.The National Wildlife Refuge System
C.The Benefits of Saving Waterfowl
D.The History of Migratory Bird Hunting

【文章大意】本文为说明文，讲述了美国为了保护“水禽”颁布了一项政策，狩猎者需要购买相关水禽类邮票，然后政府把售卖所得款拨给候鸟保护基金组织。
1.A【解析】细节理解题。根据题干信息North America以及decline定位到第一段：Millions of waterfowl were killed at… Millions of acres of wetlands were dried… greatly reducing waterfowl habitat. 分析可知，数百万的水禽被猎人和野心过大的运动员给杀害了。而数百万英亩的湿地被开垦以喂养和容纳日益增长的人口，而这大大减少了水禽的栖息地。可知，湿地流失是导致水禽数量减少的原因。 故选A。
2.C【解析】词义猜测题。根据题干信息first paragraph定位到第一段：Unfortunately, it took the explorers and the settlers who followed only a few decades to decimate a large part of these resources. 根据Unfortunately（不幸地是）可知，此处与前文 "taken care of" 形成对比，故此处应表示 "损害、毁坏" 。原文译为：不幸地是，这些探险者和定居者只花了几十年的时间就毁掉了这些资源的很大一部分。故选C。
3.D【解析】推理判断题。根据题干信息in 1934定位到第二、三段。分析可知，第二段是在说明在颁布了这个法令之后，16岁或者超过16岁以上的水禽捕猎者必须每年购买并携带联邦鸭票，而第三段则提及了大约98%的鸭子邮票的钱都是直接被用于购买保护湿地。 因此D选项, 政府可以筹集钱，符合题意。故选D。
4.A【解析】主旨大意题。根据原文分析可知，首先作者先提出了湿地的破坏导致了水禽数量的下降，而后政府则通过发行联邦鸭票筹集资金，用于保护湿地，是史上最成功的保护项目之一。因此A选项，联邦鸭票的故事符合题意。故选A。


2.【2021全国甲卷 B篇】
Port Lympne Reserve, which runs a breeding（繁育） programme, has welcomed the arrival of a rare black rhino calf （犀牛幼崽）. When the tiny creature arrived on January 31. she became the 40th black rhino to be born at the reserve. And officials at Port Lympne were delighted with the new arrival, especially as black rhinos are known for being difficult to breed in captivity（圈养）.
Paul Beer, head of rhino section at Port Lympne, said: "Obviously we're all absolutely delighted to welcome another calf to our black rhino family. She's healthy, strong and already eager to play and explore. Her mother, Solio, is a first-time mum and she is doing a fantastic job. It's still a little too cold for them to go out into the open, but as soon as the weather warms up, I have no doubt that the little one will be out and about exploring and playing every day."
The adorable female calf is the second black rhino born this year at the reserve, but it is too early to tell if the calves will make good candidates to be returned to protected areas of the wild. The first rhino to be born at Port Lympne arrived on January 5 to first-time mother Kisima and weighed about 32kg. His mother, grandmother and great grandmother were all born at the reserve and still live there.
According to the World Wildlife Fund, the global black rhino population has dropped as low as 5500, giving the rhinos a "critically endangered" status.
1.Which of the following best describes the breeding programme?
A.Costly. B.Controversial. C.Ambitious. D.Successful.

2.What does Paul Beer say about the new-born rhino?
A.She loves staying with her mother.
B.She dislikes outdoor activities.
C.She is in good condition.
D.She is sensitive to heat.

3.What similar experience do Solio and Kisima have?
A.They had their first born in January.
B.They enjoyed exploring new places.
C.They lived with their grandmothers.
D.They were brought to the reserve young.

4.What can be inferred about Port Lympne Reserve?
A.The rhino section will be open to the public.
B.It aims to control the number of the animals.
C.It will continue to work with the World Wildlife Fund.
D.Some of its rhinos may be sent to the protected wild areas.

【文章大意】本文是一篇说明文，主要讲述肯特野生动物园庆祝一只可爱的稀有动物黑犀牛幼崽的到来。
1..D 【解析】细节理解题。根据题干关键词 "the breeding programme " 定位在原文第一段第一句话Port Lympne Reserve, which runs a breeding （繁育） programme, has welcomed the arrival of a rare black rhino calf （犀牛幼崽） . 林普恩港保护区(Port Lympne Reserve)开展了一项繁殖计划，它迎来了一头稀有的黑犀牛犊牛的到来。所以，应该是成功的。故选D项。
2.C 【解析】细节理解题。根据题干关键词 "Paul Beer say" 定位在第二段他说的话，其中根据 "Obviously we're all absolutely delighted to welcome another calf to our black rhino family. She's healthy, strong and already eager to play and explore." 显然，我们都非常高兴地欢迎另一头小牛来到我们的黑犀牛家庭。她健康，强壮，并且已经渴望玩耍和探索。可知在这个新生的小犀牛状况很好。故选C项。
3.A【解析】推理判断题。根据题干关键词 "similar experience ，Solio and Kisima" 定位在原文第二段 "Her mother, Solio, is a first-time mum and she is doing a fantastic job. 她的母亲，索里奥，是第一次当妈妈，她做得很好。" 和第三段 "The first rhino to be born at Port Lympne arrived on January 5 to first-time mother Kisima and weighed about 32kg. 1月5日，在林普恩港出生的第一头犀牛来到了它的第一位母亲基西马身边，体重约32公斤。" 可知Solio 和Kisima相似点都是第一次当妈妈。故选A项。
4.D【解析】推理判断题。根据题干关键词 "PortLympne Reserve" 定位在原文第一段 "Port Lympne Reserve, which runs a breeding （繁育） programme" 和第三段 "His mother, grandmother and great grandmother were all born at the reserve and still live there. 他的母亲、祖母和曾祖母都出生在保护区，至今仍住在那里。" 可知林普恩港保护区是负责一项繁殖计划的项目，它的一些犀牛一直住在保护区，所以一些犀牛可能会被送到野生保护区。故选D项。

3.【2021全国甲卷 D篇】
Who is a genius? This question has greatly interested humankind for centuries.
Let's state clearly: Einstein was a genius. His face is almost the international symbol for genius. But we want to go beyond one man and explore the nature of genius itself. Why is it that some people are so much more intelligent or creative than the rest of us? And who are they?
In the sciences and arts, those praised as geniuses were most often white men, of European origin. Perhaps this is not a surprise. It's said that history is written by the victors, and those victors set the standards for admission to the genius club. When contributions were made by geniuses outside the club—women, or people of a different color or belief—they were unacknowledged and rejected by others.
A study recently published by Science found that as young as age six, girls are less likely than boys to say that members of their gender（性别）are "really, really smart." Even worse, the study found that girls act on that belief: Around age six they start to avoid activities said to be for children who are "really, really smart." Can our planet afford to have any great thinkers become discouraged and give up? It doesn't take a genius to know the answer: absolutely not.
Here's the good news. In a wired world with constant global communication, we're all positioned to see flashes of genius wherever they appear. And the more we look, the more we will see that social factors（因素） like gender, race, and class do not determine the appearance of genius. As a writer says, future geniuses come from those with “intelligence, creativity, perseverance（毅力）, and simple good fortune, who are able to change the world."
1.What does the author think of victors' standards for joining the genius club?
A.They're unfair. B.They're conservative.
C.They're objective. D.They're strict.

2.What can we infer about girls from the study in Science?
A.They think themselves smart.
B.They look up to great thinkers.
C.They see gender differences earlier than boys.
D.They are likely to be influenced by social beliefs.

3.Why are more geniuses known to the public?
A.Improved global communication.
B.Less discrimination against women.
C.Acceptance of victors' concepts.
D.Changes in people's social positions.

4.What is the best title for the text?
A.Geniuses Think Alike
B.Genius Takes Many Forms
C.Genius and Intelligence
D.Genius and Luck

【文章大意】本文是一篇说明文。主要讲述了天才的实质，批评了天才种族轮和性别轮，并指出其危害。
1.A【解析】推理判断题。根据题干 "victors' standards for joining the genius club" 定位到第二段It's said that history is written by the victors, and those victors set the standards for admission to the genius club. When contributions were made by geniuses outside the club—women, or people of a different color or belief—they were unacknowledged and rejected by others. 据说历史是由胜利者书写的，而这些胜利者为天才俱乐部设定了准入标准。当俱乐部外的天才——女性、不同肤色或信仰的人——做出贡献时，他们得不到认可，也会被其他人拒绝），据此可以推断出作者认为胜利者的标准是不公平的，所以选A项。
2.D【解析】推理判断题。根据题干girls from the study in Science定位到第三段A study recently published by Science found that as young as age six, girls are less likely than boys to say that members of their gender（性别）are "really, really smart." Even worse, the study found that girls act on that belief: Around age six they start to avoid activities said to be for children who are "really, really smart." 《科学》杂志最近发表的一项研究发现，在6岁时，女孩比男孩更不可能说出自己性别的成员，更糟糕的是，研究发现女孩们的行为都是基于这样的信念：在六岁左右，她们开始避免从事那些所谓 "非常聪明" 的孩子们的活动）。据此可推知女孩有可能被社会错误信念所影响，故选D项。
3.A【解析】细节理解题。根据题干 "more geniuses known to the public" 定位最后一段In a wired world with constant global communication, we're all positioned to see flashes of genius wherever they appear 在一个全球互联世界里，我们都能看到天才的出现，无论它们出现在哪里，可知更多的天才被公众所知道的原因在于改善的全球通信，故选A项。
4.B【解析】主旨大意题。A项（天才的想法相同）文章没有涉及；C项（天才和智力）只是文章的一个细节不能作为文章的主旨； D项（天才和运气）也只是在文章的最后稍微提起，也只是文章的一个小细节。根据文章的最后一句As a writer says, future geniuses come from those with "intelligence, creativity, perseverance（毅力）, and simple good fortune, who are able to change the world.”正如一位作家所说，未来的天才来自那些具有 "智慧、创造力和毅力" 的人和简单的好运，那些能改变世界的人。纵观全文可知，天成具有多样性，故选B项。

4.【2021全国乙卷 B篇】
When almost everyone has a mobile phone, why are more than half of Australian homes still paying for a landline（座机）?
These days you'd be hard pressed to find anyone in Australia over the age of 15 who doesn't own a mobile phone. In fact plenty of younger kids have one in their pocket. Practically everyone can make and receive calls anywhere, anytime.
Still, 55 percent of Australians have a landline phone at home and only just over a quarter (29%) rely only on their smartphones, according to a survey（调查）. Of those Australians who still have a landline, a third concede that it's not really necessary and they're keeping it as a security blanket—19 percent say they never use it while a further 13 percent keep it in case of emergencies. I think my home falls into that category.
More than half of Australian homes are still choosing to stick with their home phone. Age is naturally a factor（因素）—only 58 percent of Generation Ys still use landlines now and then, compared to 84 percent of Baby Boomers who've perhaps had the same home number for 50 years. Age isn't the only factor; I'd say it's also to do with the makeup of your household.
Generation Xers with young families, like my wife and I, can still find it convenient to have a home phone rather than providing a mobile phone for every family member. That said, to be honest the only people who ever ring our home phone are our Baby Boomers parents, to the point where we play a game and guess who is calling before we pick up the phone (using Caller ID would take the fun out of it).
How attached are you to your landline? How long until they go the way of gas street lamps and morning milk deliveries?
1.What does paragraph 2 mainly tell us about mobile phones?
A.Their target users.
B.Their wide popularity.
C.Their major functions.
D.Their complex design.

2.What does the underlined word "concede" in paragraph 3 mean?
A.Admit. B.Argue. C.Remember. D.Remark.

3.What can we say about Baby Boomers?
A.They like smartphone games.
B.They enjoy guessing callers' identity.
C.They keep using landline phones.
D.They are attached to their family.

4.What can be inferred about the landline from the last paragraph?
A.It remains a family necessity.
B.It will fall out of use some day.
C.It may increase daily expenses.
D.It is as important as the gas light.

【文章大意】本文是一篇说明文。当今世界上几乎所有人都有手机，但一半以上澳大利亚家庭仍然拥有座机，本文说明了出现这一现象的原因。
1..B【解析】主旨大意题。根据题干信息paragraph 2，定位到文章第二段。分析可知，该段主要说明手机在澳大利亚的使用率非常高，手机使用十分普及。故选B。
2.A【解析】词义猜测题。根据题干信息concede，定位到第三段Still, 55 percent of Australians have a landline phone at home… Of those Australians who still have a landline, a third concede that it's not really necessary…。分析可知，虽然55%的人的家中都还有座机，但他们中的三分之一的人认为座机其实并不十分必要。由此我们可以推测，这些人在说it's not necessary的时候是在承认这件事。故选A。
3.C 【解析】细节理解题。根据题干信息Baby Boomers，定位到第四段Age is naturally a factor （因素）— only 58 percent of Generation Ys still use landlines now and then, compared to 84 percent of Baby Boomers who've perhaps had the same home number for 50 years.分析可知，84%的Baby Boomers仍用座机，而且他们可能已经用同一个座机号码50年了。由此可知，Baby Boomers仍在用座机。故选C。
科普小知识：Baby Boomer指在第二次世界大战后（1946-1962）生育高峰期出生的人。
4.B【解析】推理判断题。根据题干信息last paragraph，定位到原文最后一段How long until they go the way of gas street lamps and morning milk deliveries? 。分析可知，煤气路灯和早晨送牛奶服务都离我们现在的生活比较久远，它们基本已经消失了。作者发出疑问：多久以后座机会走上煤气路灯、早晨送牛奶服务的老路呢？因此可以推测，座机有一天也会消失。选项B中的fall out of use意为开始不用、渐渐废弃，符合文意。故选B。

5.【2021全国乙卷 C篇】
You've heard that plastic is polluting the ocean—between 4.8 and 12.7 million tonnes enter ocean ecosystems every year. But does one plastic straw or cup really make a difference? Artist Benjamin Von Wong wants you to know that it does. He builds massive sculptures out of plastic garbage, forcing viewers to re-examine their relationship to single-use plastic products.
At the beginning of the year, the artist built a piece called  "Strawpocalypse, " a pair of 10-foot-tall plastic waves, frozen mid-crash. Made of 168, 000 plastic straws collected from several volunteer beach cleanups, the sculpture made its first appearance at the Estella Place shopping center in Ho Chi Minh City, Vietnam.
Just 9% of global plastic waste is recycled. Plastic straws are by no means the biggest source（来源）of plastic pollution, but they've recently come under fire because most people don't need them to drink with and, because of their small size and weight, they cannot be recycled. Every straw that's part of Von Wong's artwork likely came from a drink that someone used for only a few minutes. Once the drink is gone, the straw will take centuries to disappear.
In a piece from 2018, Von Wong wanted to illustrate（说明） a specific statistic: Every 60 seconds, a truckload's worth of plastic enters the ocean. For this work, titled "Truckload of Plastic, " Von Wong and a group of volunteers collected more than 10, 000 pieces of plastic, which were then tied together to look like they'd been dumped（倾倒） from a truck all at once.
Von Wong hopes that his work will also help pressure big companies to reduce their plastic footprint.
1.What are Von Wong's artworks intended for?
A.Beautifying the city he lives in.
B.Introducing eco-friendly products.
C.Drawing public attention to plastic waste.
D.Reducing garbage on the beach.

2.Why does the author discuss plastic straws in paragraph 3?
A.To show the difficulty of their recycling.
B.To explain why they are useful.
C.To voice his views on modern art.
D.To find a substitute for them.

3.What effect would "Truckload of Plastic" have on viewers?
A.Calming. B.Disturbing.
C.Refreshing. D.Challenging.

4.Which of the following can be the best title for the text?
A.Artists' Opinions on Plastic Safety
B.Media Interest in Contemporary Art
C.Responsibility Demanded of Big Companies
D.Ocean Plastics Transformed into Sculptures

【文章大意】本文为说明文。讲述了艺术家Benjamin Von Wong用回收到的废旧吸管创作艺术作品“吸管末日”，目的是提醒人们警惕所生产、消费的塑料垃圾，以及提高人们对改善环境问题的参与意识。

1.C【解析】细节理解题。由第一段最后一句可知，该艺术家创作的初衷是督促公众重新审视与一次性塑料制品的关系。故选C。
2.A【解析】推理判断题。第三段作者阐述了吸管由于体积小，重量轻，很难回收。故选A。
3.B 【解析】推理判断题。根据首段… forcing viewers to re-examine their relationship to… 及尾段… will also help pressure big companies to reduce their plastic footprint… 可知，原文中的Von Wong希望让人们可以重新审视他们对于塑料制品的处理方式。B选项Disturbing的意思为 "令人不安的, 引起恐慌的" ，符合文意。故选B。
4.D【解析】主旨大意题。本文围绕环保话题，介绍了一位叫本杰明的艺术家，试图用塑料垃圾创作雕塑作品，唤起公众对塑料垃圾的重视。故选D。

6.【2021全国乙卷 D篇】
During an interview for one of my books, my interviewer said something I still think about often. Annoyed by the level of distraction（干扰）in his open office, he said, "That's why I have a membership at the coworking space across the street—so I can focus." His comment struck me as strange. After all, coworking spaces also typically use an open office layout（布局）. But I recently came across a study that shows why his approach works.
The researchers examined various levels of noise on participants as they completed tests of creative thinking. They were randomly divided into four groups and exposed to various noise levels in the background, from total silence to 50 decibels（分贝）, 70 decibels, and 85 decibels. The differences between most of the groups were statistically insignificant; however, the participants in the 70 decibels group—those exposed to a level of noise similar to background chatter in a coffee shop—significantly outperformed the other groups. Since the effects were small, this may suggest that our creative thinking does not differ that much in response to total silence and 85 decibels of background noise.
But since the results at 70 decibels were significant, the study also suggests that the right level of background noise—not too loud and not total silence—may actually improve one's creative thinking ability. The right level of background noise may interrupt our normal patterns of thinking just enough to allow our imaginations to wander, without making it impossible to focus. This kind of "distracted focus" appears to be the best state for working on creative tasks.
So why do so many of us hate our open offices? The problem may be that, in our offices, we can't stop ourselves from getting drawn into others' conversations while we're trying to focus. Indeed, the researchers found that face-to-face interactions and conversations affect the creative process, and yet a coworking space or a coffee shop provides a certain level of noise while also providing freedom from interruptions.
1.Why does the interviewer prefer a coworking space?
A.It helps him concentrate.
B.It blocks out background noise.
C.It has a pleasant atmosphere.
D.It encourages face-to-face interactions.

2.Which level of background noise may promote creative thinking ability?
A.Total silence. B.50 decibels.
C.70 decibels. D.85 decibels.

3.What makes an open office unwelcome to many people?
A.Personal privacy unprotected.
B.Limited working space.
C.Restrictions on group discussion.
D.Constant interruptions.

4.What can we infer about the author from the text?
A.He's a news reporter.
B.He's an office manager.
C.He's a professional designer.
D.He's a published writer.

【文章大意】本文是一篇说明文，通过实验数据分析了过分办公室噪音对于办公效率的影响，但合伙办公有利于集中注意力，适量的声音有利于创新思维。
1.A【解析】细节理解题。由第一段第二句"… so I can focus"可知，采访者喜欢在公用工作场所办公，是因为他可以集中精力。故选A。
2.C 【解析】细节理解题。由第二段"the participants in the 70 decibels group… significantly outperformed the other groups"可知，在70分贝下采访者的表现最优，说明该环境可以改善创造性思维能力。故选C。
3.D 【解析】推理判断题。由最后一段第二句"… can't stop ourselves from getting drawn into other's conversations while we're trying to focus"可知，开放式办公环境中，经常有其他事情分散人们的注意力。故选D。
4.D【解析】推理判断题。由第一段第一句可知，作者在为自己的书接受采访，可推断他是作家。故选D。


7.【2021.6 浙江卷 C篇】
If you ever get the impression that your dog can "tell" whether you look content or annoyed, you may be onto something. Dogs may indeed be able to distinguish between happy and angry human faces, according to a new study.
Researchers trained a group of 11 dogs to distinguish between images（图像） of the same person making either a happy or an angry face. During the training stage, each dog was shown only the upper half or the lower half of the person's face. The researchers then tested the dogs' ability to distinguish between human facial expressions by showing them the other half of the person's face or images totally different from the ones used in training. The researchers found that the dogs were able to pick the angry or happy face by touching a picture of it with their noses more often than one would expect by random chance.
The study showed the animals had figured out how to apply what they learned about human faces during training to new faces in the testing stage. "We can rule out that the dogs simply distinguish hetween the pictures bused on a simple cue, such as the sight of teeth, " said study anthor Corsin Muller.  "Instead, our results suggest that the surcessful dogs realized that a smiling mouth means the same thing as smiling eyes, and the same rule applies to an angry mouth having the same meaning as angry eyes."
"With our study, we think we can now confidently conclude that at least some dogs can distinguish human facial expressions," Muller told Live Science.
At this point, it is not clear why dogs seem to be equipped with the ability to recognize different facial expressions in humans."To us, the most likely explanation appears to be that the basis lies in their living with humans, which gives them a lot of exposure to human facial expressions, ” and this exposure has provided them with many chances to learn to distinguish between them, Muller said.
1.The new study focused on whether dogs can           .
A.distinguish shapes
B.make sense of human faces
C.feel happy or angry
D.communicate with each other

2.What can we learn about the study from paragraph 2?
A.Researchers tested the dogs in random order.
B.Diverse methods were adopted during training.
C.Pictures used in the two stages were different.
D.The dogs were photographed before the test.

3.What is the last paragraph mainly about?
A.A suggestion for future studies.
B.A possible reason for the study findings.
C.A major limitation of the study.
D.An explanation of the research method.

【文章大意】 本文是一篇科普类说明文，实验研究表明，狗能够辨别人类的不同的面部的高兴还是愤怒表情。
1.B【解析】细节理解题。根据第一段第二句 "Dogs may indeed be able to distinguish between happy and angry human faces, according to a new study." 可知，狗能够分辨开心的表情和不开心的表情，故选B。
2 .C【解析】推断题。根据第二段第三句 "The researchers then tested the dogs' ability to distinguish between human facial expressions by showing them the other half of the person's face or images totally different from the ones used in training." 可知，训练时和测试时使用的人脸照片完全不同，故选C。
3.B【解析】主旨大意题。根据文章最后一段可知，狗为何能够识别人的表情的原因不明，紧接着给出了最可能的解释：可能是狗长期与人类生活，所以练就了识别人类表情的能力，故选B。

二、2020年高考真题
1. 【2020·全国卷I，C】
Race walking shares many fitness benefits with running, research shows, while most likely contributing to fewer injuries. It does, however, have its own problem.
Race walkers are conditioned athletes. The longest track and field event at the Summer Olympics is the 50-kilometer race walk, which is about five miles longer than the marathon. But the sport’s rules require that a race walker’s knees stay straight through most of the leg swing and one foot remain in contact (接触) with the ground at all times. It’s this strange form that makes race walking such an attractive activity, however, says Jaclyn Norberg, an assistant professor of exercise science at Salem State University in Salem, Mass.
Like running, race walking is physically demanding, she says, According to most calculations, race walkers moving at a pace of six miles per hour would burn about 800 calories(卡路里) per hour, which is approximately twice as many as they would burn walking, although fewer than running, which would probably burn about 1,000 or more calories per hour.
However, race walking does not pound the body as much as running does, Dr. Norberg says. According to her research, runners hit the ground with as much as four times their body weight per step, while race walkers, who do not leave the ground, create only about 1.4 times their body weight with each step.
As a result, she says, some of the injuries associated with running, such as runner’s knee, are uncommon among race walkers. But the sport’s strange form does place considerable stress on the ankles and hips, so people with a history of such injuries might want to be cautious in adopting the sport. In fact, anyone wishing to try race walking should probably first consult a coach or experienced racer to learn proper technique, she says. It takes some practice.
1. Why are race walkers conditioned athletes?
A. They must run long distances.
B. They are qualified for the marathon.
C. They have to follow special rules.
D. They are good at swinging their legs.
2. What advantage does race walking have over running?
A. It’s more popular at the Olympics.
B. It’s less challenging physically.
C. It’s more effective in body building.
D. It’s less likely to cause knee injuries.
3. What is Dr. Norberg’s suggestion for someone trying race walking?
A. Getting experts’ opinions.
B. Having a medical checkup.
C. Hiring an experienced coach.
D. Doing regular exercises.
4. Which word best describes the author’s attitude to race walking?
A. Skeptical. B. Objective.
C. Tolerant. D. Conservative.
【文章大意】这是一篇说明文。短文介绍了竞走相比跑步有诸多的优势，但是之前受过伤的人，要想从事这样运动要谨慎，最好咨询专家的建议。
1. C【解析】细节理解题。根据第二段“But the sport’s rules require that a race walker’s knees stay straight through most of the leg swing and one foot remain in contact with the ground at all times.”可知，但这项运动的规则要求竞走者的膝盖在摆动腿的大部分时间保持伸直，一只脚始终与地面接触。由此可知，竞走运动员是需要具备某些条件的运动员是因为运动员需要遵守特殊的规则。故选C项。
2. D【解析】细节理解题。根据最后一段“As a result, she says, some of the injuries associated with running, such as runner’s knee, are uncommon among race walkers.”可知，一些与跑步有关的损伤，比如跑步者的膝盖，在竞走者中并不常见。由此可知，竞走与跑步相比的优势是不太可能导致膝盖受伤。故选D项。
3. A【解析】细节理解题。根据最后一段Dr. Norberg说的话“In fact, anyone wishing to try race walking should probably first consult a coach or experienced racer to learn proper technique(事实上，任何想尝试竞走的人都应该首先咨询教练或有经验的竞走运动员，学习适当的技巧。)”可知，Dr. Norberg建议想尝试竞走的人征询专家的建议。故选A项。
4. B【解析】推理判断题。根据第一段“Race walking shares many fitness benefits with running, research shows, while most likely contributing to fewer injuries. It does, however, have its own problem.”可知，研究表明，竞走和跑步一样有很多健身益处，而且它还很少导致受伤。不过，它也有自己的问题。由此判断出作者对于竞走的态度是客观的。故选B项。
2. 【2020·全国卷I，D】
The connection between people and plants has long been the subject of scientific research. Recent studies have found positive effects. A study conducted in Youngstown，Ohio，for example, discovered that greener areas of the city experienced less crime. In another，employees were shown to be 15% more productive when their workplaces were decorated with houseplants.
The engineers at the Massachusetts Institute of Technology(MIT)have taken it a step further changing the actual composition of plants in order to get them to perform diverse，even unusual functions. These include plants that have sensors printed onto their leaves to show when they’re short of water and a plant that can detect harmful chemicals in groundwater. ＂We’re thinking about how we can engineer plants to replace functions of the things that we use every day,＂explained Michael Strano, a professor of chemical engineering at MIT.
One of his latest projects has been to make plants glow(发光)in experiments using some common vegetables. Strano’s team found that they could create a faint light for three-and-a-half hours. The light，about one-thousandth of the amount needed to read by，is just a start. The technology, Strano said, could one day be used to light the rooms or even to turn trees into self-powered street lamps.
In the future，the team hopes to develop a version of the technology that can be sprayed onto plant leaves in a one-off treatment that would last the plant’s lifetime. The engineers are also trying to develop an on and off＂switch＂where the glow would fade when exposed to daylight.
Lighting accounts for about 7% of the total electricity consumed in the US. Since lighting is often far removed from the power source(电源)-such as the distance from a power plant to street lamps on a remote highway-a lot of energy is lost during transmission(传输).Glowing plants could reduce this distance and therefore help save energy.
1. What is the first paragraph mainly about?
A. A new study of different plants.
B. A big fall in crime rates.
C. Employees from various workplaces.
D. Benefits from green plants.
2. What is the function of the sensors printed on plant leaves by MIT engineer?
A. To detect plants’ lack of water
B. To change compositions of plants
C. To make the life of plants longer.
D. To test chemicals in plants.
3. What can we expect of the glowing plants in the future?
A. They will speed up energy production.
B. They may transmit electricity to the home.
C. They might help reduce energy consumption.
D. They could take the place of power plants.
4. Which of the following can be the best title for the text?
A. Can we grow more glowing plants?
B. How do we live with glowing plants?
C. Could glowing plants replace lamps?
D. How are glowing plants made pollution-free?
【文章大意】这是一篇说明文。文章主要说明了绿色植物对人们很有好处，因此麻省理工学院的工程师开发了一种发光植物。文章介绍了他们发明这种植物的过程，以及这种植物的一些优势，指出在未来发光植物有可能取代路灯，达到节约能源的作用。
1. D【解析】主旨大意题。根据第一段中A study conducted in Youngstown, Ohio, for example ,discovered that greener areas of the city experienced less crime. In another, employees were shown to be 15% more productive when their workplaces were decorated with houseplants.可知例如，在俄亥俄州扬斯敦进行的一项研究发现，城市绿化较好的地区犯罪率较低。在另一项研究中，当员工的工作场所被室内植物装饰时，他们的工作效率会提高15%。由此可知，第一段的主旨是关于绿色植物的益处。故选D。
2. A【解析】细节理解题。根据第二段中These include plants that have sensors printed on their leaves to show when they're short of water and a plant that can detect harmful chemicals in groundwater.可知这就包括叶子上印有传感器来显示植物缺水的情况的植物，还有一种植物可以检测到地下水中的有害化学物质。由此可知，麻省理工学院工程师植物叶片上印上传感器的作用是检测植物缺水的情况。故选A。
3. C【解析】细节理解题。根据最后一段中Glowing plants could reduce this distance and therefore help save energy.可知发光的植物可以缩短这段距离，从而帮助节约能源。由此可知，这种发光的植物在未来可能有助于减少能源消耗。故选C。
4. C【解析】主旨大意题。根据最后一段中Lighting accounts for about 7%of the total electricity consumed in the US. Since lighting is often far removed from the power source-such as the distance from a power plant to street lamps on a remote highway-a lot of energy is lost during transmission. Glowing plants could reduce this distance and therefore help save energy.可知照明约占美国总耗电量的7%。由于照明通常远离电源，例如从发电厂到偏僻公路上路灯的距离，在传输过程中会损失大量能源。发光的植物可以缩短这段距离，从而帮助节约能源。结合文章主要说明了绿色植物对人们很有好处，因此麻省理工学院的工程师开发了一种发光植物，文章介绍了他们发明这种植物的过程，以及这种植物的一些优势，指出在未来发光植物有可能取代路灯，达到节约能源的作用。由此可知，C选项“发光的植物能取代路灯吗？”最符合文章标题。故选C。
3. 【2020·全国卷II，B】
Some parents will buy any high-tech toy if they think it will help their child, but researchers said puzzles help children with math-related skills.
Psychologist Susan Levine, an expert on mathematics development in young children the University of Chicago, found children who play with puzzles between ages 2 and 4 later develop better spatial skills. Puzzle play was found to be a significant predictor of cognition(认知) after controlling for differences in parents’ income, education and the amount of parent talk, Levine said.
The researchers analyzed video recordings of 53 child-parent pairs during everyday activities at home and found children who play with puzzles between 26 and 46 months of age have better spatial skills when assessed at 54 months of age.
“The children who played with puzzles performed better than those who did not, on tasks that assessed their ability to rotate(旋转)and translate shapes,” Levine said in a statement.
The parents were asked to interact with their children as they normally would, and about half of children in the study played with puzzles at one time. Higher-income parents tended to have children play with puzzles more frequently, and both boys and girls who played with puzzles had better spatial skills. However, boys tended to play with more complex puzzles than girls, and the parents of boys provided more spatial language and were more active during puzzle play than parents of girls.
The findings were published in the journal Developmental Science.
1. In which aspect do children benefit from puzzle play?
A. Building confidence. B. Developing spatial skills.
C. Learning self-control. D. Gaining high-tech knowledge.
2. What did Levine take into consideration when designing her experiment？
A. Parents’ age. B. Children’s imagination.
C. Parents’ education. D. Child-parent relationship.
3. How do boy differ from girls in puzzle play?
A. They play with puzzles more often.
B. They tend to talk less during the game.
C. They prefer to use more spatial language.
D. They are likely to play with tougher puzzles.
4. What is the text mainly about?
A. A mathematical method. B. A scientific study.
C. A woman psychologist D. A teaching program.
【文章大意】本文是说明文。是关于孩子们玩智力游戏的研究，介绍了研究考虑的因素，研究过程和结果。
1. B【解析】细节理解题。根据第二段中…found children who play with puzzles between ages 2 and 4 develop better spatial skill(在2岁到4岁之间玩智力游戏的儿童在空间能力方面更好)可知，孩子们可以从智力游戏中发展更好的空间技能。B. Developing spatial skills(发展空间能力)符合以上说法，故选B项。
2. C【解析】细节理解题。根据第二段中Puzzle play was found to be a significant predictor of cognition after controlling for difference in parents' income, education and the amount of parent talk, Levine said.( Levine说，在父母的收入、教育和父母谈话次数方面控制差异性之后，拼图游戏被发现是一个重要的认知预测)可知Levine在设计这个试验时考虑了父母的收入、教育程度和父母谈话的次数。C. Parents' education.(父母的教育)符合以上说法，故选C项。
3. D【解析】细节理解题。根据倒数第二段中However, boys tended to play with more complex puzzles than girls,可知男孩比女孩更喜欢玩复杂的谜题，即他们可能会玩难度更大的谜题。D. They are likely to play with tougher puzzles.(他们有可能玩更复杂的谜题)符合以上说法，故选D项。
4. B【解析】主旨大意题。本文是关于孩子们玩智力游戏的研究，介绍了研究考虑的因素，研究过程和结果。所以是关于科学研究的。B. A scientific study(一项科学研究)符合以上说法，故选B项。
4. 【2020·全国卷II，C】
When you were trying to figure out what to buy for the environmentalist on your holiday list, fur probably didn’t cross your mind. But some ecologists and fashion (时装)enthusiasts are trying to bring back the market for fur made from nutria(海狸鼠).
Unusual fashion shows in New Orleans and Brooklyn have(showcased)nutria fur made into clothes in different styles. “It sounds crazy to talk about guilt-free fur-unless you understand that the nutria are destroying vast wetlands every year”, says Cree McCree, project director of Righteous Fur.
Scientists in Louisiana were so concerned that they decided to pay hunters $5 a tail. Some of the fur ends up in the fashion shows like the one in Brooklyn last month.
Nutria were brought there from Argentina by fur farmers and let go into the wild. “The ecosystem down there can’t handle this non-native species(物种).It’s destroying the environment. It’s them or us.” says Michael Massimi, an expert in this field.
The fur trade kept nutria check for decades，but when the market for nutria collapsed in the late 1980s，the cat-sized animals multiplied like crazy.
Biologist Edmond Mouton runs the nutria control program for Louisiana. He says it’s not easy to convince people that nutria fur is green, but he has no doubt about it. Hunters bring in more than 300,000 nutria tails a year, so part of Mouton’s job these days is trying to promote fur.
Then there’s Righteous Fur and its unusual fashion. Model Paige Morgan says，”To give people a guilt-free option that they can wear without someone throwing paint on them-1 think that’s going to be a massive thing, at least here in New York.” Designer Jennifer Anderson admits it took her a while to come around to the opinion that using nutria fur for her creations is morally acceptable. She trying to come up with a lable to attach to nutria fashions to show it is eco-friendly.
28. What is the purpose of the fashion shows in New Orleans and Brooklyn?
A. To promote guilt-free fur.
B. To expand the fashion market.
C. To introduce a new brand.
D. To celebrate a winter holiday.
29. Why are scientists concerned about nutria?
A. Nutria damage the ecosystem seriously.
B. Nutria are an endangered species.
C. Nutria hurt local cat-sized animals.
D. Nutria are illegally hunted.
30. What does the underlined word “collapsed” in paragraph 5 probably mean?
A. Boomed. B. Became mature. C. Remained stable. D. Crashed.
31. What can we infer abouf wearing fur in New York according to Morgan?
A. It’s formal. B. It’s risky. C. It’s harmful. D. It’s traditional.
【答案】
28. A29. A30. D31. B
【文章大意】本文是说明文。介绍了美国新奥良和布鲁克林举办了不同寻常的时装秀。展出海狸鼠制成的皮衣。海狸鼠们每年都在破坏大片的湿地，因此设计师称这是一种环保的举措，科学家们也对海狸鼠损坏生态平衡表示了担忧。
28. 推理判断题。根据第二段Unusual fashion shows in New Orleans and Brooklyn have showcased nutria fur made into clothes in different styles. “It sounds crazy to talk about guilt-free fur-unless you understand that the nutria are destroying vast wetlands every year,”says Cree McCree, project director of Righteous Fur.得知，美国新奥尔良和布鲁克林举办了不同寻常的时装秀，时装秀上展出海狸鼠皮制成的不同风格的衣服，项目总监Cree McCree说：“除非了解海狸鼠正每年破坏大片湿地，否则谈论无罪感皮衣是很疯狂的事情”，可以判断出由于海狸鼠对生态造成了巨大的破坏，这场海狸鼠皮衣时装秀销售的是无罪恶感皮衣。故选A。
29. 推理判断题。根据第三段Scientists in Louisiana were so concerned that they decided to pay hunters $5 a tail.得知，科学家们如此担心以至于他们决定按照一条海狸鼠尾巴付给猎人们5美元，可以推断出科学家们担忧海狸鼠们严重破坏生态平衡，。故选A。
30. 词义猜测题。根据第五段The fur trade kept nutria in check for decades, but when the market for nutria collapsed in the late 1980s,the cat-sized animals multiplied like crazy. 得知，毛皮贸易使海狸鼠受到了几十年的控制，但是当海狸鼠市场在20世纪80年代末崩溃时，这种猫大小的动物数量疯长，根据but判断，这是转折关系，以前由于皮毛交易，海狸鼠处于控制，现在这种海狸鼠之所以能够数量激增，是由于市场不再销售海狸鼠皮毛导致的，可以推断出划线词collapsed 是和D.crashed倒闭的意思最相近。故选D。
31. 推理判断题。根据第二段Model Paige Morgan says, “To give people a guilt –free option that they can wear without someone throwing paint on them-I think that’s going to be a massive thing, at least in New York. ” 得知，为了给人们一种无罪的选择，人们可以穿皮衣而不被人们泼油漆，我认为在纽约将是一件巨大的事情，根据模特摩根所说得知，在纽约穿皮质衣服是有风险的。故选B。
5. 【2020·全国卷III，D】
We are the products of evolution, and not just evolution that occurred billions of years ago. As scientists look deeper into our genes(基因), they are finding examples of human evolution in just the past few thousand years. People in Ethiopian highlands have adapted to living at high altitudes. Cattle -raising people in East Africa and northern Europe have gained a mutation (突变) that helps them digest milk as adults.
On Thursday in an article published in Cell, a team of researchers reported a new kind of adaptation — not to air or to food, but to the ocean. A group of sea-dwelling people in Southeast Asia have evolved into better divers. The Bajau, as these people are known, number in the hundreds of thousands in Indonesia, Malaysia and the Philippines. They have traditionally lived on houseboats; in recent times, they’ve also built houses on stilts (支柱) in coastal waters. “They are simply a stranger to the land,” said Redney C. Jubilado, a University of Hawaii researcher who studies the Bajau.
Dr. Jubilado first met the Bajau while growing up on Samal Island in the Philippines. They made a living as divers, spearfishing or harvesting shellfish. “We were so amazed that they could stay underwater much longer than us local islanders,” Dr. Jubilado said. “I could see them actually walking under the sea.”
In2015, Melissa Ilardo, then a graduate student in genetics at the University of Copenhagen, heard about the Bajau. She wondered if centuries of diving could have led to the evolution of physical characteristics that made the task easier for them. “it seemed like the perfect chance for natural selection to act on a population,” said Dr. Ilardo. She also said there were likely a number of other genes that help the Bajau dive.
32. What does the author want to tell us by the examples in paragraph 1?
A. Environmental adaptation of cattle raisers. B. New knowledge of human evolution.
C. Recent findings of human origin. D. Significance of food selection.
33. Where do the Bajau build their houses?
A. In valleys. B. Near rivers. C. On the beach. D. Off the coast.
34. Why was the young Jubilado astonished at the Bajau?
A. They could walk on stilts all day. B. They had a superb way of fishing.
C. They could stay long underwater. D. They lived on both land and water.
35. What can be a suitable title for the text?
A. Bodies Remodeled for a Life at Sea B. Highlanders’ Survival Skills
C. Basic Methods of Genetic Research D. The World’s Best Divers
【答案】
32. B33. D34. C35. A
【文章大意】这是一篇说明文。最近一项对人类基因的研究发现，人类的进化不仅仅发生在数十亿年前，而且最近几千年也有。Bajau人因为靠海为生，他们的身体已经进化成更能适应海洋生活。
32. 推理判断题。根据第一段的we are the products of evolution, and not just evolution that occurred billions of years ago. As scientists look deeper into our genes, they are finding examples of human evolution in just the past few thousand years.(我们是进化的产物，而且不仅仅是数十亿年前的产物。当科学家更深入的研究我们的基因时，他们发现了人类在过去几千年进化的例子)可知，作者列举第一段的例子是为了告诉我们关于人类进化的一个新信息，那就是人类在最近几千年也在进化。B. New knowledge of human evolution.(人类进化的新知识)符合以上说法，故选B项。
33. 细节理解题。根据第二段的The Bajau, as these people are known, number in hundreds of thousands in Indonesia, Malaysia and the Philippines. They have traditionally live on houseboats; in recent times, they've also built houses on stilts in coastal waters.(这些人被称为Bajau，在印度尼西亚、马来西亚和菲律宾有数十万人。他们一直住在船屋上；最近他们也把房子建在沿海水域的吊脚楼上)可知，Bajau把房子建在沿海区域。D. Off the coast.(沿海)符合以上说法，故选D项。
34. 细节理解题。根据第三段的we were so amazed that they could stay underwater much longer than us local islanders.(我们很惊讶，他们在水下待的时间比我们当地的岛民要长的多)可知，让Jubilado感到吃惊的是Bajau人能在水下待更长的时间。C. They could stay long underwater. (他们能在水下待很长时间)符合以上说法，故选C项。
35. 主旨大意题。根据文章的主要内容，尤其是第二段的On Thursday in an article published in Cell, a team of researchers reported a new kind of adaption-not to air or to food, but to the ocean.(周四，在《细胞》杂志上发表的一篇文章中，一群研究人员报道了一种新的适应——不是空气也不是食物，而是海洋)可知，本文主要讲述了一种新的进化，即长期生活在海边，靠海为生的生活方式，让Bajau人的身体进化成更适应海洋生活。A. Bodies Remodeled for a Life at Sea.(身体为适应海洋生活而重塑)可以作为本文标题，故选A项。
5. 【2020·山东卷，D】
According to a recent study in the Journal of Consumer Research, both the size and consumption habits of our eating companions can influence our food intake. And contrary to existing research that says you should avoid eating with heavier people who order large portions(份), it's the beanpoles with big appetites you really need to avoid.
To test the effect of social influence on eating habits, the researchers conducted two experiments. In the first, 95 undergraduate women were individually invited into a lab to ostensibly(表面上)participate in a study about movie viewership. Before the film began, each woman was asked to help herself to a snack. An actor hired by the researchers grabbed her food first. In her natural state, the actor weighed 105 pounds. But in half the cases she wore a specially designed fat suit which increased her weight to 180 pounds.
Both the fat and thin versions of the actor took a large amount of food. The participants followed suit, taking more food than they normally would have. However, they took significantly more when the actor was thin.
For the second test, in one case the thin actor took two pieces of candy from the snack bowls. In the other case, she took 30 pieces. The results were similar to the first test: the participants followed suit but took significantly more candy when the thin actor took 30 pieces.
The tests show that the social environment is extremely influential when we're making decisions. If this fellow participant is going to eat more, so will I. Call it the “I’ll have what she's having” effect. However, we'll adjust the influence. If an overweight person is having a large portion, I'll hold back a bit because I see the results of his eating habits. But if a thin person eats a lot, I'll follow suit. If he can eat much and keep slim, why can't I?
12. What is the recent study mainly about?
A. Food safety. B. Movie viewership.
C. Consumer demand. D. Eating behavior.
13. What does the underlined word “beanpoles” in paragraph 1 refer to?
A. Big eaters. B. Overweight persons.
C. Picky eaters. D. Tall thin persons.
14. Why did the researchers hire the actor?
A. To see how she would affect the participants.
B. To test if the participants could recognize her.
C. To find out what she would do in the two tests.
D. To study why she could keep her weight down.
15. On what basis do we “adjust the influence” according to the last paragraph?
A. How hungry we are. B. How slim we want to be.
C. How we perceive others. D. How we feel about the food.
【答案】
12. D13. D14. A15. C
【文章大意】本文是说明文。最近的研究表明：我们的饮食伙伴的大小和消费习惯都会影响我们的食物摄入量。文章详述了这个实验的过程。
12. 细节理解题。根据第一段中的“According to a recent study in the Journal of Consumer Research, both the size and consumption habits of our eating companions can influence our food intake”可知，根据消费者研究杂志最近的一项研究，我们的饮食伙伴的大小和消费习惯都会影响我们的食物摄入量。因此这项研究是关于饮食行为的。故选D。
13. 词义猜测题。根据前半句“And contrary to existing research that says you should avoid eating with heavier people who order large portions（份）”可知，现有的研究认为：你应该避免和体重较重、点大份饭菜的人一起吃饭。后半句认为，你真正应该避免的是the beanpoles with big appetites。由contrary to可推断出，画线词和heavier people（超重的人）相反，结合选项，D选项（瘦瘦高高的人）正好和heavier people正好相反。故选D。
14. 推理判断题。根据第二段的“To test the effect of social influence on eating habits, the researchers conducted two experiments”可知， 为了测试社会影响对饮食习惯的影响，研究人员进行了两个实验。根据倒数第三段的内容可知，在两个实验中，胖的和瘦的演员都吃了大量的食物。参与者也照做，吃的食物比平常多。 然而，当演员是瘦的时候，参与者们服用的食物更多。由此推断，研究人员雇用演员是为了看看她如何影响参与者。故选A。
15. 推理判断题。根据最后一段中的“If an overweight person is having a large portion, I’ll hold back a bit because I see the results of his eating habits. But if a thin person eats a lot, I’ll follow suit. If he can eat much and keep slim, why can’t I? ”可知，如果一个超重的人吃很大一份，我会忍住一点，因为我看到了他饮食习惯的结果。但如果一个瘦的人吃很多，我会跟着做。如果他吃得多保持苗条，为什么我不能呢？ 因此推断我们是根据我们对他人的看法（即：如何看待他人）来调整影响的。故选C。

三、2019年高考真题
1. 【2019·全国卷I，C】
As data and identity theft becomes more and more common, the market is growing for biometric(生物测量)technologies—like fingerprint scans—to keep others out of private e-spaces. At present, these technologies are still expensive, though.
Researchers from Georgia Tech say that they have come up with a low-cost device(装置)that gets around this problem: a smart keyboard. This smart keyboard precisely measures the cadence(节奏)with which one types and the pressure fingers apply to each key. The keyboard could offer a strong layer of security by analyzing things like the force of a user's typing and the time between key presses. These patterns are unique to each person. Thus, the keyboard can determine people's identities, and by extension, whether they should be given access to the computer it's connected to—regardless of whether someone gets the password right.
It also doesn't require a new type of technology that people aren't already familiar with. Everybody uses a keyboard and everybody types differently.
In a study describing the technology, the researchers had 100 volunteers type the word “touch”four times using the smart keyboard. Data collected from the device could be used to recognize different participants based on how they typed, with very low error rates. The researchers say that the keyboard should be pretty straightforward to commercialize and is mostly made of inexpensive, plastic-like parts. The team hopes to make it to market in the near future.
28. Why do the researchers develop the smart keyboard?
A. To reduce pressure on keys. B. To improve accuracy in typing
C. To replace the password system. D. To cut the cost of e-space protection.
29. What makes the invention of the smart keyboard possible？
A. Computers are much easier to operate.
B. Fingerprint scanning techniques develop fast.
C. Typing patterns vary from person to person.
D. Data security measures are guaranteed.
30. What do the researchers expect of the smart keyboard？all 1o soisgitieoco oll.
A. It'll be environment-friendly. B. It'll reach consumers soon.
C. It'll be made of plastics. D. It'll help speed up typing.
31. Where is this text most likely from?
A. A diary. B. A guidebook C. A novel. D. A magazine.
【语篇解读】这是一篇说明文。数据和身份盗窃变得越来越普遍，目前，向指纹扫描等这些技术仍然是昂贵的。本文介绍了一种新的科技——智能键盘，它能给e-space用户带来安全，而且这项技术也不贵。
28.D
【解析】细节理解题。根据第一段的At present, these technologies are still expensive, though.和第二段的Researchers from Georgia Tech say that they have come up with a low-cost device that gets around this problem: a smart key board.可知，研究者们开发智能键盘是为了降低e-space保护的成本。故选D。
29.C
【解析】细节理解题。根据第二段的The key board could offer a strong layer of security by analyzing things like the force of a user’s typing and the time between key presses. These patterns are unique to each person. Thus，the keyboard can determine people’s identities可知，因为每个人的打字方式不同，使智能键盘能够识别人的身份。故选C。
30.B
【解析】细节理解题。根据最后一段的The team hopes to make it to market in the near future.可知，研究者们希望智能键盘能早日面世。故选B。
31.D
【解析】推理判断题。本文介绍了一种新的科技——智能键盘，它能给e-space用户带来安全，由此可知，本文是关于科技，结合所给选项可知，本文可能来自于一本杂志。故选D。
2. 【2019·全国卷I，D】
During the rosy years of elementary school(小学), I enjoyed sharing my dolls and jokes, which allowed me to keep my high social status. I was the queen of the playground. Then came my tweens and teens, and mean girls and cool kids. They rose in the ranks not by being friendly but by smoking cigarettes, breaking rules and playing jokes on others, among whom I soon found myself.
Popularity is a well-explored subject in social psychology. Mitch Prinstein, a professor of clinical psychology sorts the popular into two categories: the likable and the status seekers. The likables’ plays-well-with-others qualities strengthen schoolyard friendships, jump-start interpersonal skills and, when tapped early, are employed ever after in life and work. Then there’s the kind of popularity that appears in adolescence: status born of power and even dishonorable behavior.
Enviable as the cool kids may have seemed, Dr. Prinstein’s studies show unpleasant consequences. Those who were highest in status in high school, as well as those least liked in elementary school, are “most likely to engage(从事)in dangerous and risky behavior.”
In one study, Dr. Prinstein examined the two types of popularity in 235 adolescents, scoring the least liked, the most liked and the highest in status based on student surveys(调查研究). “We found that the least well-liked teens had become more aggressive over time toward their classmates. But so had those who were high in status. It clearly showed that while likability can lead to healthy adjustment, high status has just the opposite effect on us."
Dr. Prinstein has also found that the qualities that made the neighbors want you on a play date-sharing, kindness, openness — carry over to later years and make you better able to relate and connect with others.
In analyzing his and other research，Dr. Prinstein came to another conclusion: Not only is likability related to positive life outcomes, but it is also responsible for those outcomes, too. "Being liked creates opportunities for learning and for new kinds of life experiences that help somebody gain an advantage, ” he said.
32. What sort of girl was the author in her early years of elementary school?
A. Unkind. B. Lonely. C. Generous. D. Cool.
33. What is the second paragraph mainly about？
A. The classification of the popular.
B. The characteristics of adolescents.
C. The importance of interpersonal skills.
D. The causes of dishonorable behavior
34. What did Dr. Prinstein’s study find about the most liked kids?
A. They appeared to be aggressive.
B. They tended to be more adaptable.
C. They enjoyed the highest status.
D. They performed well academically.
35. What is the best title for the text?
A. Be Nice-You Won’t Finish Last
B. The Higher the Status, the Beer
C. Be the Best-You Can Make It
D. More Self-Control, Less Aggressiveness
【语篇解读】这是一篇说明文。文章主要讲到研究表明，对别人好，讨人喜欢对人生活的各个方面有深远的有益影响。
32.C
【解析】推理判断题。根据第一段During the rosy years of elementary school, I enjoyed sharing my dolls and jokes, which allowed me to keep my high social status（在美好的小学时光里，我喜欢分享我的娃娃和笑话，这让我保持了高高的社会地位。）由此推断出，作者在小学早期时，是一个慷慨的女孩。unkind不友善的；lonely寂寞的；generous慷慨的；cool冷静的，故选C。
33.A
【解析】主旨大意题。第二段Mitch Prinstein, a professor of clinical psychology sorts the popular into two categories: the likable and the status seekers.（临床心理学教授Mitch Prinstein将受欢迎的人分为两类:讨人喜欢的人和追求地位的人。）是段落主题句，本段内容分别对the likable 和the status seekers 做了解释，所以本段主要介绍了两种受欢迎的分类，故选A。
34.B
【解析】推理判断题。根据第四段It clearly showed that while likability can lead to healthy adjustment （它清楚地表明，可爱可以促使健全的调整），由此推断出，心理学教授Mitch Prinstein的研究表明，最有人望的孩子适应性更强，故选B。
35.A
【解析】主旨大意题。通过阅读全文内容，尤其是最后一段，可知这篇文章主要讲了受欢迎，讨人喜欢对人生活的各个方面有深远的有益影响。与选项A“对别人好——最终，你的收获无穷无尽”一致，故选A。
4. 【2019·全国卷II，D】
Bacteria are an annoying problem for astronauts. The microorganisms(微生物) from our bodies grow uncontrollably on surfaces of the International Space Station, so astronauts spend hours cleaning them up each week. How is NASA overcoming this very tiny big problem? It’s turning to a bunch of high school kids. But not just any kids. It depending on NASA HUNCH high school class, like the one science teachers Gene Gordon and Donna Himmelberg lead at Fairport High School in Fairport, New York.
HUNCH is designed to connect high school classrooms with NASA engineers. For the past two years, Gordon’s students have been studying ways to kill bacteria in zero gravity, and they think they’re close to a solution(解决方案). “We don’t give the students any breaks. They have to do it just like NASA engineers,” says Florence Gold, a project manager.
“There are no tests,” Gordon says. “There is no graded homework. There almost are no grades, other than‘Are you working towards your goal?’ Basically, it’s ‘I’ve got to produce this product and then, at the end of year, present it to NASA.’ Engineers come and really do an in-person review, and…it’s not a very nice thing at time. It’s a hard business review of your product.”
Gordon says the HUNCH program has an impact(影响) on college admissions and practical life skills. “These kids are so absorbed in their studies that I just sit back. I don’t teach.” And that annoying bacteria? Gordon says his students are emailing daily with NASA engineers about the problem, readying a workable solution to test in space.
32. What do we know about the bacteria in the International Space Station?
A. They are hard to get rid of. B. They lead to air pollution.
C. They appear different forms. D. They damage the instruments.
33. What is the purpose of the HUNCH program?
A. To strengthen teacher-student relationships. B. To sharpen students’ communication skills.
C. To allow students to experience zero gravity. D. To link space technology with school education
34. What do the NASA engineers do for the students in the program?
A. Check their product. B. Guide project designs
C. Adjust work schedules. D. Grade their homework.
35. What is the best title for the text?
A. NASA: The Home of Astronauts.
B. Space: The Final Homework Frontier.
C. Nature: An Outdoor Classroom.
D. HUNCH:A College Admission Reform.
【语篇解读】本文为说明文。本文介绍了HUNCH项目就是通过Gordon的学生找到如何杀死空间站的细菌这一技术，把空间技术与带进课堂，与学校教育相结合，从而最终影响到大学入学。
32.A
【解析】细节理解题。根据第一段中的“Bacteria are annoying problem for astronauts. The microorganisms form our bodies grow uncontrollably on surfaces of the International Space Station, so astronauts spend hours cleaning them up each week.”可知，细菌对宇航员来说是个令人讨厌的问题。这种来自我们身体的微生物在国际空间站的表面不受控制地生长，宇航员每周要花几个小时来清理它们。也就是说它们很难去掉。其中的“the microorganisms”包括“bacteria”。由此可知， A项符合题意。
33.D
【解析】推理判断题。根据第二段的 “HUNCH is designed to connect high school classrooms with NASA engineers. Gordon’s students have been studying ways to kill bacteria in zero gravity,...”可知，Hunch旨在把高中教室和NASA的工程师联系起来。Gordon的学生一直在研究如何在零重力下杀死细菌, ...”。结合最后一段中的“Gordon students are emailing daily with NASA engineers about the problem,...”可知，学生每天都给NASA的工程师发邮件一起探讨（如何杀死空间站的细菌这一空间技术）这个问题。由此可推断出HUNCH program的目的把空间技术与学校教育相结合。分析选项可知D项符合题意。
34.A
【解析】细节理解题。根据第三段中的“I’ve got to produce this product and then, at the end of the year ,present it to NASA, ”“Engineers come and really do an in-person review，and ...It’s not a very nice thing at times. It’s a hard business review of your product.”可知，NASA的工程师要检查学生所做的产品。分析选项可知A项符合题意，故选A。
35.B
主旨大意题。文章以国际空间站里的微生物很难清除开头，引出宇航员们解决此问题的途径 —— 借助美国国家航空航天局的HUNCH高中班，此计划的目的是把航天技术与学校教育结合起来。在这项计划里，学生们通过homework（制作供美国国家航空航天局使用的产品）探索无疆的太空，因此“太空：最后的功课疆域”最适合做文章的标题。故选B。
3. 【2019·全国卷III，C】
Before the 1830smost newspapers were sold through annual subscriptions in America, usually $8 to $10 a year. Today $8 or $10 seems a small amount of money, but at that time these amounts were forbidding to most citizens. Accordingly, newspapers were read almost only by rich people in politics or the trades. In addition, most newspapers had little in them that would appeal to a mass audience. They were dull and visually forbidding. But the revolution that was taking place in the 1830s would change all that.
The trend, then, was toward the "penny paper"-a term referring to papers made widely available to the public. It meant any inexpensive newspaper; perhaps more importantly it meant newspapers that could be bought in single copies on the street.
This development did not take place overnight. It had been possible(but not easy)to buy single copies of newspapers before 1830,but this usually meant the reader had to go down to the printer's office to purchase a copy. Street sales were almost unknown. However, within a few years, street sales of newspapers would be commonplace in eastern cities. At first the price of single copies was seldom a penny-usually two or three cents was charged-and some of the older well-known papers charged five or six cents. But the phrase "penny paper " caught the public's fancy, and soon there would be papers that did indeed sell for only a penny.
This new trend of newspapers for "the man on the street" did not begin well. Some of the early ventures(企业)were immediate failures. Publishers already in business, people who were owners of successful papers, had little desire to change the tradition. It took a few youthful and daring businessmen to get the ball rolling.
28. Which of the following best describes newspapers in America before the 1830s?
A. Academic. B. Unattractive. C. Inexpensive. D. Confidential.
29. What did street sales mean to newspapers?
A. They would be priced higher. B. They would disappear from cities.
C. They could have more readers. D. They could regain public trust.
30. Who were the newspapers of the new trend targeted at?
A. Local politicians. B. Common people.
C. Young publishers. D. Rich businessmen.
31. What can we say about the birth of the penny paper?
A. It was a difficult process. B. It was a temporary success.
C. It was a robbery of the poor. D. It was a disaster for printers.
【语篇解读】本文为说明文。文章叙述了“便士报纸”的诞生历史。
28.B
【解析】细节理解题。根据第一段中的“Before1830s，... Accordingly newspapers were read almost only by rich people. In addition ,most newspapers had little in them that would appeal to mass audience. They were dull and visually forbidding.”可知，在19世纪30年代之前,只有富人才能读报纸，而且大多数报纸中几乎没有能吸引大众的内容，让人感觉无聊，，视觉上令人望而却步。由此可得出那时的报纸没有什么吸引力。分析选项，A . Academic学术的；B. Unattractive没有吸引力， 无魅力的； C. Inexpensive廉价的，不贵的； D. Confidential机密的，保密的。可知 A、C和D是错误的，只有B符合题意，故选B。
29.C
【解析】推理判断题。根据第二段提到“便士报纸”针对大众，很便宜的。更重要的是，在街上可以买的到报纸。 结合第三段中间的“streets sales of newspapers would be commonplaced in eastern cities”可知，报纸的街头销售随处可见。由此可推断出，街头销售意味读报纸的多了。分析选项可知C符合题，故选C。
30.B
【解析】细节理解题。根据第二段中的“The trend, then, was ‘penny paper’—a term referring to papers made widely available to the public. perhaps more importantly it meant newspapers that could be bought in single copies on the street.”可知，这种“便士报纸”针对大众的，在街上可以买的到报纸。分析选项可知，选项B符合题意，故选B。
31.A
【解析】推理判断题。第二段“The trend, then, was ‘penny paper’”及最后一段“The new trend of newspapers for ‘the man on the street’ did not begin well. Some of the early ventures were immediately failures. Publishers already in business, people who owners of successful papers, had little desires to change the tradition. It took a few youthful and daring businessmen to get the ball rolling.”可知，“便士报纸”新趋势一开始并不好，一些早期的尝试立即失败了。已经进入商业领域的成功的出版商，并不想改变这一传统。后来一些年轻而大胆的商人才推动了这件事。由此可推断出“便士报纸”的诞生是一个困难而曲折的过程。分析选项可知，A项符合题意，故选A。
5. 【2019·全国卷III，D】
Monkeys seem to have a way with numbers.
A team of researchers trained three Rhesus monkeys to associate 26 clearly different symbols consisting of numbers and selective letters with 0-25 drops of water or juice as a reward. The researchers then tested how the monkeys combined—or added—the symbols to get the reward.
Here's how Harvard Medical School scientist Margaret Livingstone, who led the team, described the experiment: In their cages the monkeys were provided with touch screens. On one part of the screen, a symbol would appear, and on the other side two symbols inside a circle were shown. For example, the number 7 would flash on one side of the screen and the other end would have 9 and 8. If the monkeys touched the left side of the screen they would be rewarded with seven drops of water or juice; if they went for the circle, they would be rewarded with the sum of the numbers—17 in this example.
After running hundreds of tests, the researchers noted that the monkeys would go for the higher values more than half the time, indicating that they were performing a calculation, not just memorizing the value of each combination.
When the team examined the results of the experiment more closely, they noticed that the monkeys tended to underestimate(低估)a sum compared with a single symbol when the two were close in value—sometimes choosing, for example, a 13 over the sum of 8 and 6. The underestimation was systematic: When adding two numbers, the monkeys always paid attention to the larger of the two, and then added only a fraction(小部分)of the smaller number to it.
"This indicates that there is a certain way quantity is represented in their brains, "Dr. Livingstone says. “But in this experiment what they're doing is paying more attention to the big number than the little one.”
32. What did the researchers do to the monkeys before testing them?
A. They fed them. B. They named them.
C. They trained them. D. They measured them.
33. How did the monkeys get their reward in the experiment?
A. By drawing a circle. B. By touching a screen.
C. By watching videos. D. By mixing two drinks.
34. What did Livingstone's team find about the monkeys?
A. They could perform basic addition. B. They could understand simple words.
C. They could memorize numbers easily. D. They could hold their attention for long.
35. In which section of a newspaper may this text appear?
A. Entertainment. B. Health. C. Education. D. Science.
【语篇解读】这是一篇说明文。研究发现：猴子可以进行基本的加法运算。文章对研究的经过和结论做了介绍和分析。
32.C
【解析】细节理解题。根据第二段中的“A team of researchers trained three Rhesus monkeys…The researches then tested how…”可知，在对这些猴子进行测试之前，研究者们对它们进行了培训。故C选项正确。
33.B
【解析】细节理解题。根据第三段中的“In their cages the monkeys were provided with touch screen…If the monkeys touched the left side of the screen, they would be rewarded with seven drops…; if they went for the circle, they would be rewarded with…”可知，当猴子触摸屏幕左边时，它们会得到7滴水或者果汁的奖励；当它们触摸屏幕的另一端（即画着圆圈的部分）时，它们会得到17滴水或果汁的奖励。由此可知，猴子是通过触摸屏幕得到奖励的。B选项正确。
34.A
【解析】细节理解题。根据第四段“The monkeys would go for the higher values more than half the time, indicating that they were performing a calculation, not just memorizing the value of each combination”和第五段中的“When adding two numbers…”可知，猴子会在超过一半的时间内选择更高的值，这意味着它们在进行计算，而不仅仅是记住每一个组合的值。由此可知，A选项正确：猴子能够进行基本的加法计算。由此亦可以排除C选项。
35.D
【解析】推理判断题。通读整篇文章可知，该文介绍的是哈佛医学院的科学家Margaret Livingstone领导的一个研究团队对猴子进行实验得出的研究结果。这属于“科学研究”范畴，故该文应出现在报纸的“科学”板块。故D选项正确。
6. 【2019·北京卷，C】
The problem of robocalls has gotten so bad that many people now refuse to pick up calls from numbers they don't know. By next year，half of the calls we receive will be scams(欺诈).We are finally waking up to the severity of the problem by supporting and developing a group of tools，apps and approaches intended to prevent scammers from getting through. Unfortunately，it's too little，too late. By the time these “solutions"(解决方案)become widely available，scammers will have moved onto cleverer means. In the near future，it's not just going to be the number you see on your screen that will be in doubt. Soon you will also question whether the voice you're hearing is actually real.
That's because there are a number of powerful voice manipulation ( 处理 ) and automation technologies that are about to become widely available for anyone to use .At this year's I/O Conference ,a company showed a new voice technology able to produce such a convincing human –sounding voice that it was able to speak to a receptionist and book a reservation without detection.
These developments are likely to make our current problems with robocalls much worse. The reason that robocalls are a headache has less to do with amount than precision A decade of data breaches(数据侵入)of personal information has led to a situation where scammers can easily learn your mother 's name ，and far more. Armed with this knowledge. they're able to carry out individually targeted campaigns to cheat people. This means. for example，that a scammer could call you from what looks to be a familiar number and talk to you using a voice that sounds exactly like your bank teller 's，ricking you into "confirming " your address，mother's name，and card number. Scammers follow money，so companies will be the worst hit. A lot of business is still done over the phone，and much of it is based on trust and existing relationships. Voice manipulation technologies may weaken that gradually.
We need to deal with the insecure nature of our telecom networks. Phone carriers and consumers need to work together to find ways of determining and communicating what is real. That might mean either developing a uniform way to mark videos and images, showing when and who they were made by. or abandoning phone calls altogether and moving towards data-based communications—using apps like Face Time or WhatsApp, which can be tied to your identity.
Credibility is hard to earn but easy to lose, and the problem is only going to harder from here on out.
38. How does the author feel about the solutions to problem of robecalls?
A. Panicked. B. Confused. C. Embarrassed. D. Disappointed.
39. taking advantage of the new technologies，scammer can______.
A. aim at victims precisely B. damage databases easily
C. start campaigns rapidly D. spread information widely
40. What does the passage imply?
A. Honesty is the best policy.
B. Technologies can be double-edited.
C. There are more solutions than problems.
D. Credibility holds the key to development.
41. Which of the following would be the best title for the passage?
A. Where the Problem of Robocalls Is Rooted
B. Who Is to Blame for the Problem of Roboealls
C. Why Robocalls Are About to Get More Dangerous
D. How Robocalls Are Affecting the World of Technology
【语篇解读】这是一篇说明文。语音操作与自动化技术的出现使得机器人电话可以以假乱真。语音操作和自动化技术发展会使得机器人电话产生的问题更加严重。
38. D
【解析】观点态度题。根据第一段中的“We are finally waking up to the severity of the problem by supporting and developing a group of tools, apps and approaches intended to prevent scammers from getting through. Unfortunately, it’s too little, too late. By the time these “solutions” become widely available, scammers will have moved onto clever means”可知，最后，我们通过支持和开发一组旨在防止欺诈者通过的工具、应用程序和方法，认识到了问题的严重性。不幸的是，我们的努力太少了，也太晚了。在这些“解决方案”被广泛使用的时候，骗子将转移到更巧妙的手段上。由此推知，作者认为这些“解决办法”对于解决问题起不了什么作用，因此作者感到很“失望”。故D选项正确。
39.A
【解析】细节理解题。根据第三段中的“The reason that robocalls are a headache has less to do with amount than precision. A decade of data breaches of personal information has led to a situation where scammers can easily learn your mother’s name, and far more. Armed with this knowledge, they’re able to carry out individually targeted campaigns to cheat people. This means, for example, that a scammer could call you from what looks to be a familiar number and talk to you using a voice that sounds exactly like your bank teller’s, tricking you into “confirming” your address, mother’s name, and card number”可知，机器人通话之所以令人头痛，与其说与数量有关，不如说与精确度有关。长达十年的个人信息泄露已经导致了这样一种情况：骗子可以轻易地知道你母亲的名字，甚至更多。有了这些知识，他们就能够开展有针对性的运动来欺骗人们。根据这些可知，利用这种新的技术，欺诈者们可以精确的确定他们行骗的目标。故A选项正确。
40.B
【解析】推理判断题。根据第二段最后一句可知，这项语音技术可以产生一个听起来和人类非常相似的声音，它可以和接待员进行交谈，进行预订。由此可知，这项新技术有其好的方面。根据第三段的叙述可知，欺诈者们可以利用这项新技术来进行欺诈行为。由此推知，这项新技术既可以发挥好的作用，也可能为坏人所利用，产生不好的作用，因此可以说它是一把双刃剑。故B选项正确。
41.C
【解析】主旨大意题。第一段提到：robocalls（机器人电话: 自动拨号播放录音信息的推销电话）在未来变得会越来越严重，不仅仅是出现在你的手机屏幕上的电话号码令人怀疑，而且你会质疑听到的声音是否是真的。第二段介绍原因：语音操作与自动化技术的出现使得机器人电话可以以假乱真。第三段介绍了语音操作和自动化技术发展会使得机器人电话产生的问题更加严重。最后两段提出我们该如何应对这些问题。综上，文章第一段点明文章中心：机器人电话问题在未来会变得越来越严重。下文都是围绕这一话题展开的。故C选项适合作标题。
7. 【2019·北京卷，D】
By the end of the century，if not sooner，the world's oceans will be bluer and greener thanks to a warming climate，according to a new study.
At the heart of the phenomenon lie tiny marine microorganisms(海洋微生物)called phytoplankton. Because of the way light reflects off the organisms，these phytoplankton create colourful patterns at the ocean surface. Ocean colour varies from green to blue，depending on the type and concentration of phytoplankton. Climate change will fuel the growth of phytoplankton in some areas，while reducing it in other spots，leading to changes in the ocean's appearance.
Phytoplankton live at the ocean surface，where they pull carbon dioxide(二氧化碳)into the ocean while giving off oxygen. When these organisms die，they bury carbon in the deep ocean，an important process that helps to regulate the global climate. But phytoplankton are vulnerable to the ocean's warming trend. Warming changes key characteristics of the ocean and can affect phytoplankton growth，since they need not only sunlight and carbon dioxide to grow，but also nutrients.
Stephanie Dutkiewicz，a scientist in MIT's Center for Global Change Science，built a climate model that projects changes to the oceans throughout the century. In a world that warms up by 3℃，it found that multiple changes to the colour of the oceans would occur. The model projects that currently blue areas with little phytoplankton could become even bluer. But in some waters，such as those of the Arctic，a warming will make conditions riper for phytoplankton，and these areas will turn greener. “Not only are the quantities of phytoplankton in the ocean changing. ”she said，“but the type of phytoplankton is changing. ”
42. What are the first two paragraphs mainly about?
A. The various patterns at the ocean surface.
B. The cause of the changes in ocean colour.
C. The way light reflects off marine organisms.
D. The efforts to fuel the growth of phytoplankton.
43. What does the underlined word“vulnerable”in Paragraph 3 probably mean?
A. Sensitive. B. Beneficial C. Significant D. Unnoticeable
44. What can we learn from the passage?
A. Phytoplankton play a declining role in the marine ecosystem.
B. Dutkiewicz's model aims to project phytoplankton changes
C. Phytoplankton have been used to control global climate
D. Oceans with more phytoplankton may appear greener.
45. What is the main purpose of the passage？
A. To assess the consequences of ocean colour changes
B. To analyse the composition of the ocean food chain
C. To explain the effects of climate change on oceans
D. To introduce a new method to study phytoplankton
【语篇解读】本文为说明文。一项最新研究表明，由于气候变暖，世界海洋将会变得更蓝、更绿。这一现象是因为一种叫做浮游植物的微小海洋微生物，因为光线反射的作用，它们在海洋表面形成了五颜六色的图案。但是浮游植物很容易受到海洋变暖趋势的影响。气候变暖会改变海洋的主要特征，并影响浮游植物的生长。
42. B
【解析】段落大意题。第一段“By the end of the century. If not sooner, the world's oceans will be bluer and greener thanks to a warming climate, according to a new study.”可知，到本世纪末，一项新的研究表明，由于气候变暖，如果不尽快的话，世界上的海洋将会变得更蓝、更绿。结合第二段“At the heart phenomenon lie tiny marine microorganisms called phytoplankton. Becaust of the way light reflects off the organisms ,these phytoplanktons create colourful patterns at the ocean surface. Ocean colour varies from green to blue, depending on the type and concentration”可知，这种现象的核心是一种叫做浮游植物的微小海洋微生物，在光线的作用下在海洋表面形成了五颜六色的图案。海洋的颜色从绿色到蓝色不等，这取决于海洋的类型和浮游植物浓度。由此可推断出这两段主要叙述了海洋生物是海洋颜色变化的原因。分析选项可知B符合题意，故选B。
43. A
【解析】词义猜测题。根据划线词后的“Warming changes key characteristics of the ocean and can affect phytoplankton growth, since they need not only sunshine and carbon dioxide to grow, but also nutrients.”可知，气候变暖会改变海洋的主要特征，并会影响浮游植物的生长。由此可判断“But phytoplankton are vulnerable to the ocean’s wamning trend”可知，浮游植物很容易受到海洋变暖趋势的影响。可知A项正确。
44. D
【解析】推理判断题。根据第四段“The model projects that currently blue areas with little phytoplankton could become even bluer. But in some waters ,such as those of the Arctic, a warming will make conditions riper for phytoplankton, and these areas will turn greener”,可知Dutkiewicz的模型预测，目前只有少量浮游植物的蓝色区域可能会变得更蓝。但是在一些水域，比如北极，气候变暖会使浮游植物的生长条件更加成熟，而这些水域会变得更绿了”。由此可推断，浮游植物的生长条件更加成熟，浮游动植物就更多了，这些水域会变得更绿了。分析选项可知D项符合题意。
45. C
【解析】目的意图题。第一段提出文章的主旨“By the end of the century. If not sooner, the world's oceans will be bluer and greener thanks to a warming climate, according to a new study.”可知到本世纪末。一项新的研究表明，由于气候变暖，如果不尽快的话，世界上的海洋将会变得更蓝、更绿。再结合第三段“But phytoplankton are vulnerable to the ocean’s warning trendWarming changes key characteristics of the ocean and can affect phytoplankton growth, …”可知，“浮游植物很容易受到海洋警告趋势的影响，变暖改变了海洋的关键特征，并能影响浮游植物的生长”。可知本文主要解释气候变化对海洋的影响。故选C。
8. 【2019·天津卷，C】
How does an ecosystem（生态系统）work？What makes the populations of different species the way they are？Why are there so many flies and so few wolves？To find an answer，scientists have built mathematical models of food webs，noting who eats whom and how much each one eats.
With such models，scientists have found out some key principles operating in food webs. Most food webs，for instance，consist of many weak links rather than a few strong ones. When a predator（掠食动物）always eats huge numbers of a single prey（猎物），the two species are strongly linked；when a predator lives on various species，they are weakly linked. Food webs may be dominated by many weak links because that arrangement is more stable over the long term. If a predator can eat several species，it can survive the extinction（灭绝）of one of them. And if a predator can move on to another species that is easier to find when a prey species becomes rare，the switch allows the original prey to recover. The weak links may thus keep species from driving one another to extinction.
Mathematical models have also revealed that food webs may be unstable，where small changes of top predators can lead to big effects throughout entire ecosystems. In the 1960s，scientists proposed that predators at the top of a food web had a surprising amount of control over the size of populations of other species---including species they did not directly attack.
And unplanned human activities have proved the idea of top-down control by top predators to be true. In the ocean，we fished for top predators such as cod on an industrial scale，while on land，we killed off large predators such as wolves. These actions have greatly affected the ecological balance.
Scientists have built an early-warning system based on mathematical models. Ideally，the system would tell us when to adapt human activities that are pushing an ecosystem toward a breakdown or would even allow us to pull an ecosystem back from the borderline. Prevention is key，scientists says because once ecosystems pass their tipping point（临界点），it is remarkably difficult for them to return.
46. What have scientists discovered with the help of mathematical models of food webs？
A. The living habits of species in food webs.
B. The rules governing food webs of the ecosystems.
C. The approaches to studying the species in the ecosystems.
D. The differences between weak and strong links in food webs.
47. A strong link is found between two species when a predator______
A. has a wide food choice
B. can easily find new prey
C. sticks to one prey species
D. can quickly move to another place
48. What will happen if the populations of top predators in a food web greatly decline？
A. The prey species they directly attack will die out.
B. The species they indirectly attack will turn into top predators.
C. The living environment of other species will remain unchanged.
D. The populations of other species will experience unexpected changes.
49. What conclusion can be drawn from the examples in Paragraph 4？
A. Uncontrolled human activities greatly upset ecosystems.
B. Rapid economic development threatens animal habitats.
C. Species of commercial value dominate other species.
D. Industrial activities help keep food webs stable.
50. How does an early-warning system help us maintain the ecological balance？
A. By getting illegal practices under control.
B. By stopping us from killing large predators.
C. By bringing the broken-down ecosystems back to normal.
D. By signaling the urgent need for taking preventive action.
【语篇解读】这是一篇说明文。本文介绍了借助食物网的数学模型，科学家们发现了一些在食物网运营的关键原则。科学家们说;因为一个生态系统越过了它的临界点，它们很难再回来。该系统将告诉我们何时适应人类活动，这些活动正将生态系统推向崩溃，或者甚至允许我们将生态系统从边缘拉回来，预防是关键。
46.B
【解析】细节理解题。根据第一段的With such models, scientists have found out some key principles operating in food webs.可知，借助食物网的数学模型，科学家们发现了食物网中的一些关键原则。故选B。
47. C
【解析】细节理解题。根据第一段的When a predator(掠食动物) always eats huge numbers of a single prey(猎物)，the two species are strongly linked可知，当捕食者总是吃大量的单一猎物，这两个物种是紧密相连的。故选C。
48. D
【解析】推理判断题。根据第二段的In the 1960s, scientists proposed that predators at the top of a food web had, a surprising amount of control over the size of populations of other species they did not directly attack可知，处于食物网顶端的食肉动物对它们没有直接攻击的其他物种的种群数量有着惊人的控制，由此可推断出，如果食物链顶级食肉动物的数量大大下降，其他物种的种群将经历意想不到的变化。故选D。
49.A
【解析】推理判断题。根据第四段的Ideally the system would tell us when to adapt human activities that are pushing an ecosystem toward a breakdown or would even allow us to pull an ecosystem back from the borderline可知，人类过度的活动会将生态系统推向崩溃，由此可推断出，不受控制的人类活动极大地破坏了生态系统。故选A。
50. D
【解析】细节理解题。根据最后一段的Scientists have built an early-warning system based on mathematical models. Ideally the system would tell us when to adapt human activities that are pushing an ecosystem toward a breakdown or would even allow us to pull an ecosystem back from the borderline.可知，早期变暖系统发出紧急需要采取预防行动的信号帮助我们维持生态平衡。故选D。
9. 【2019·江苏卷，B】
In the 1960s，while studying the volcanic history of Yellowstone National Park，Bob Christiansen became puzzled about something that，oddly，had not troubled anyone before:he couldn't find the park's volcano. It had been known for a long time that Yellowstone was volcanic in nature — that's what accounted for all its hot springs and other steamy features. But Christiansen couldn't find the Yellowstone volcano anywhere.
Most of us，when we talk about volcanoes，think of the classic cone(圆锥体)shapes of a Fuji or Kilimanjaro，which are created when erupting magma(岩浆)piles up. These can form remarkably quickly. In 1943，a Mexican farmer was surprised to see smoke rising from a small part of his land. In one week he was the confused owner of a cone five hundred feet high. Within two years it had topped out at almost fourteen hundred feet and was more than half a mile across. Altogether there are some ten thousand of these volcanoes on Earth，all but a few hundred of them extinct. There is，however，a second les known type of volcano that doesn't involve mountain building. These are volcanoes so explosive that they burst open in a single big crack，leaving behind a vast hole，the caldera. Yellowstone obviously was of this second type，but Christiansen couldn't find the caldera anywhere.
Just at this time NASA decided to test some new high-altitude cameras by taking photographs of Yellowstone. A thoughtful official passed on some of the copies to the park authorities on the assumption that they might make a nice blow-up for one of the visitors' centers. As soon as Christiansen saw the photos，he realized why he had failed to spot the caldera; almost the whole park-2.2 million acres—was caldera. The explosion had left a hole more than forty miles across—much too huge to be seen from anywhere at ground level. At some time in the past Yellowstone must have blown up with a violence far beyond the scale of anything known to humans.
58. What puzzled Christiansen when he was studying Yellowstone？
A. Its complicated geographical features.
B. Its ever-lasting influence on tourism.
C. The mysterious history of the park.
D. The exact location of the volcano.
59. What does the second-paragraph mainly talk about？
A. The shapes of volcanoes.
B. The impacts of volcanoes.
C. The activities of volcanoes.
D. The heights of volcanoes.
60. What does the underlined word "blow-up" in the last paragraph most probably mean？
A. Hot-air balloon. B. Digital camera.
C. Big photograph. D. Bird's view.
【语篇解读】本文为说明文。讲述了二十世纪六十年代Bob Christiansen在研究黄石公园的火山历史时，奇怪地发现到处看不到火山的影子，原来，这儿的火山并不是像我们大部分人想象的那种圆锥体形状的高耸的样子，而是一个巨大的洞，这个洞太大了以至于从地面上的任何地方都看不见。
58.D
【解析】细节理解题。根据第一段最后一句But Christiansen couldn’t find the Yellowstone volcano anywhere.可知，他困惑的是到处看不到火山。故选D。
59.A
【解析】主旨大意题。本段讲述了两种形状的火山，一种是通常人们所理解的由火山岩浆堆积形成的圆锥体，还有一种极具爆发力的火山，它们会在一个大裂缝中爆裂，留下一个巨大的洞，故选A。
60.C
【解析】词义猜测题。根据第三段第一句Just at this time NASA decided to test some new high-altitude cameras by taking photographs of Yellowstone. A thoughtful official passed on some of the copies to the park authorities on the assumption that they might make a nice blow-up for one of the visitors’ centers.可知，美国国家航空和宇宙航行局为测试一些新的高海拔照相机而拍摄了黄石公园的照片。一位深思熟虑的官员把其中的一些照片副本转交给了公园管理部门，认为他们可能会将其放大以供一个游客中心展示。故可知，此处意为将照片放大，选C。
10. 【2019·浙江卷，C】
California has lost half its big trees since the 1930s, according to a study to be published Tuesday and climate change seems to be a major factor(因素).
The number of trees larger than two feet across has declined by 50 percent on more than 46, 000 square miles of California forests, the new study finds. No area was spared or unaffected, from the foggy northern coast to the Sierra Nevada Mountains to the San Gabriels above Los Angeles. In the Sierra high country, the number of big trees has fallen by more than 55 percent; in parts of southern California the decline was nearly 75 percent.
Many factors contributed to the decline, said Patrick Mclntyre, an ecologist who was the lead author of the study. Woodcutters targeted big trees. Housing development pushed into the woods. Aggressive wildfire control has left California forests crowded with small trees that compete with big trees for resources(资源).
But in comparing a study of California forests done in the 1920s and 1930s with another one between 2001 and 2010, Mclntyre and his colleagues documented a widespread death of big trees that was evident even in wildlands protected from woodcutting or development.
The loss of big trees was greatest in areas where trees had suffered the greatest water shortage. The researchers figured out water stress with a computer model that calculated how much water trees were getting in comparison with how much they needed, taking into account such things as rainfall, air temperature, dampness of soil, and the timing of snowmelt(融雪).
Since the 1930s, Mclntyre said, the biggest factors driving up water stress in the state have been rising temperatures, which cause trees to lose more water to the air, and earlier snowmelt, which reduces the water supply available to trees during the dry season.
27. What is the second paragraph mainly about?
A. The seriousness of big-tree loss in California.
B. The increasing variety of California big trees.
C. The distribution of big trees in California forests.
D. The influence of farming on big trees in California.
28. Which of the following is well-intentioned but may be bad for big trees?
A. Ecological studies of forests.
B. Banning woodcutting.
C. Limiting housing development.
D. Fire control measures.
29. What is a major cause of the water shortage according to Mclntyre?
A. Inadequate snowmelt. B. A longer dry season.
C. A warmer climate. D. Dampness of the air.
30. What can be a suitable title for the text?
A. California's Forests: Where Have All the Big Trees Gone?
B. Cutting of Big Trees to Be Prohibited in California Soon
C. Why Are the Big Trees Important to California Forests?
D. Patrick Mclntyre: Grow More Big Trees in California
【语篇解读】本文为说明文，根据一项研究表明，自20世纪30年代以来，加州已经失去了一半的大树，气候变化似乎是其主要因素。
27.A
主旨大意题。在第二段中，作者用具体数据说明了大树损失在各个地区的严重程度，没有任何地区幸免或不受影响，故选A。
28. D
【解析】推理判断题。根据第三段最后一句Aggressive wildfire control has left California forests crowded with small trees that compete with big trees for resources（资源）.可知，野火控制在控制了森林大火的同时，使得加利福尼亚的森林里挤满了小树，它们与大树争夺资源，这对大树产生了不利的影响，故选D。
29.C
【解析】细节理解题。根据最后一段the biggest factors driving up water stress in the state have been rising temperatures, …, and earlier snowmelt, …可知，造成加州水资源短缺的最大因素是气温的上升，以及较早的融雪，故选C。
30.A
【解析】主旨大意题。通读全文可知，自20世纪30年代以来，加州已经失去了一半的大树，文章分析了引起该现象的几个主要因素。全文围绕“加州森林的大树都去哪儿了”话题展开，故选项A符合题意。
四、2018年高考真题
1.【2018·全国卷I，D】
We may think we’re a culture that gets rid of our worn technology at the first sight of something shiny and new, but a new study shows that we keep using our old devices (装置) well after they go out of style. That’s bad news for the environment – and our wallets – as these outdated devices consume much more energy than the newer ones that do the same things.
To figure out how much power these devices are using, Callie Babbitt and her colleagues at the Rochester Institute of Technology in New York tracked the environmental costs for each product throughout its life – from when its minerals are mined to when we stop using the device. This method provided a readout for how home energy use has evolved since the early 1990s. Devices were grouped by generation. Desktop computers, basic mobile phones, and box-set TVs defined 1992. Digital cameras arrived on the scene in 1997. And MP3 players, smart phones, and LCD TVs entered homes in 2002, before tablets and e-readers showed up in 2007.
As we accumulated more devices, however, we didn’t throw out our old ones. “The living-room television is replaced and gets planted in the kids’ room, and suddenly one day, you have a TV in every room of the house,” said one researcher. The average number of electronic devices rose from four per household in 1992 to 13 in 2007. We’re not just keeping these old devices – we continue to use them. According to the analysis of Babbitt’s team, old desktop monitors and box TVs with cathode ray tubes are the worst devices with their energy consumption and contribution to greenhouse gas emissions (排放) more than doubling during the 1992 to 2007 window.
So what’s the solution (解决方案)? The team’s data only went up to 2007, but the researchers also explored what would happen if consumers replaced old products with new electronics that serve more than one function, such as a tablet for word processing and TV viewing. They found that more on-demand entertainment viewing on tablets instead of TVs and desktop computers could cut energy consumption by 44%.
32. What does the author think of new devices?
A. They are environment-friendly. B. They are no better than the old.
C. They cost more to use at home. D. They go out of style quickly.
33. Why did Babbitt’s team conduct the research?
A. To reduce the cost of minerals.
B. To test the life cycle of a product.
C. To update consumers on new technology.
D. To find out electricity consumption of the devices.
34. Which of the following uses the least energy?
A. The box-set TV. B. The tablet.
C. The LCD TV. D. The desktop computer.
35. What does the text suggest people do about old electronic devices?
A. Stop using them. B. Take them apart.
C. Upgrade them. D. Recycle them.
【文章大意】本文是一篇科普说明文。文章讲述了新旧电子设备的差别，旧电子设备耗能高、不环保。所以作者主张使用新电子设备。
32.A
【解析】观点态度题。根据文章第一段中的That’s bad news for the environment – and our wallets – as these outdated devices consume much more energy than the newer ones that do the same things.可知，使用旧的电子设备对环境和我们的钱包都是坏消息。这些过时的设备做相同的事情要消耗比新设备更多的能量。由此推知作者认为新电子设备环保、节能。故选A。
33.D
【解析】细节理解题。根据文章第二段中的To figure out how much power these devices are using, Callie Babbitt and her colleagues at the Rochester Institute of Technology in New York tracked the environmental costs for each product throughout its life 可知，Babbitt’s team研究的目的是弄清楚这些设备用了多少电。故选D。
34.B
【解析】细节理解题。根据文章最后一段中的They found that more on-demand entertainment viewing on tablets instead of TVs and desktop computers could cut energy consumption by 44%.可知，平板电脑是耗能最少的电子设备，可以降低44%的耗能。故选B。
35.A
【解析】推理判断题。根据文章的整体内容可知，因为旧的电子设备耗能高，不环保。所以作者建议停止使用旧的电子设备。故选A。
【点睛】
熟悉比较句型是彻底理解本文的关键，也是解题的关键。本文中的比较句型：
1. That’s bad news for the environment – and our wallets – as these outdated devices consume much more energy than the news ones that do the same things
做同样的事，旧的过时的装置比新装置消耗更多能源，对环境有害，浪费钱财。
2. According to the analysis of Babbitt’s team, old desktop monitors and box TVs with cathode ray tubes are the worst devices with their energy consumption and contribution to greenhouse gas emissions (排放) more than doubling during the 1992 to 2007 window.
根据Babbitt团队的分析，旧的桌面监视器和阴极射线管箱式电视机是最差的电子设备，它们的耗能和温室气体的排放是1992到2007window的两倍还多。
3. They found that more on-demand entertainment viewing on tablets instead of TVs and desktop computers could cut energy consumption by 44%.他们发现在平板电脑上看的随需变化的娱乐节目比在电视和电脑上看耗能减少了44%。
2.【2018·全国卷II，B】
Many of us love July because it’s the month when nature’s berries and stone fruits are in abundance. These colourful and sweet jewels form British Columbia’s fields are little powerhouses of nutritional protection.
Of the common berries, strawberries are highest in vitamin C, although, because of their seeds, raspberries contain a little more protein (蛋白质), iron and zinc (not that fruits have much protein). Blueberries are particularly high in antioxidants (抗氧化物质). The yellow and orange stone fruits such as peaches are high in the carotenoids we turn into vitamin A and which are antioxidants. As for cherries (樱桃), they are so delicious who cares? However, they are rich in vitamin C.
When combined with berries of slices of other fruits, frozen bananas make an excellent base for thick, cooling fruit shakes and low fat “ice cream”. For this purpose, select ripe bananas for freezing as they are much sweeter. Remove the skin and place them in plastic bags or containers and freeze. If you like, a squeeze of fresh lemon juice on the bananas will prevent them turning brown. Frozen bananas will last several weeks, depending on their ripeness and the temperature of the freezer.
If you have a juicer, you can simply feed in frozen bananas and some berries or sliced fruit. Out comes a “soft-serve” creamy dessert, to be eaten right away. This makes a fun activity for a children’s party; they love feeding the fruit and frozen bananas into the top of the machine and watching the ice cream come out below.
24. What does the author seem to like about cherries?
A. They contain protein. B. They are high in vitamin A.
C. They have a pleasant taste. D. They are rich in antioxidants.
25. Why is fresh lemon juice used in freezing bananas?
A. To make them smell better. B. To keep their colour.
C. To speed up their ripening. D. To improve their nutrition.
26. What is “a juicer” in the last paragraph?
A. A dessert. B. A drink.
C. A container. D. A machine.
27. From which is the text probably taken?
A. A biology textbook. B. A health magazine.
C. A research paper. D. A travel brochure.
【文章大意】本文是一篇说明文。文章主要介绍并比较了几种水果各自的营养价值和健康功效，并列出了一些食用这些水果的方法。
24.C
【解析】细节理解题。题干问的是，作者喜欢樱桃什么。根据第二段中As for cherries (樱桃), they are so delicious who cares?（至于樱桃，因为它们很好吃谁在乎呢?）可知，作者在乎的是它的美味。故选C。
25.B
【解析】细节理解题。根据第三段中的If you like, a squeeze of fresh lemon juice on the bananas will prevent them turning brown.可知，往香蕉上滴新鲜的柠檬汁是为了防止香蕉变成褐色，故新鲜的柠檬汁是被用来保持香蕉的颜色的。故选B。
26.D
【解析】词义猜测题。根据最后一段中they love feeding the fruit and frozen bananas into the top of the machine and watching the ice cream come out below可知，孩子们喜欢把一些水果和冷冻的香蕉放入到这台机器的上部，然后看到冰激凌从下面出来。故可以推出a juicer就是一台机器。故选D。
27.B
【解析】文章出处题。文章首先指出七月是水果盛产的季节，并指出各种水果富含的营养，最后一段指出我们可以用a juicer为孩子们做一些甜点和冰激凌，故最可能是从健康杂志上摘取的文章。A项意为：生物教科书；B项意为：一本健康杂志；C项意为：一篇研究论文；D项意为：一本旅游手册。故选B。
3.【2018·全国卷III，B】
Cities usually have a good reason for being where they are, like a nearby port or river. People settle in these places because they are easy to get to and naturally suited to communications and trade. New York City, for example, is near a large harbour at the mouth of the Hudson River. Over 300 years its population grew gradually from 800 people to 8 million. But not all cities develop slowly over a long period of time. Boom towns grow from nothing almost overnight. In 1896, Dawson, Canada, was unmapped wilderness(荒野). But gold was discovered there in 1897, and two years later, it was one of the largest cities in the West, with a population of 30,000.
Dawson did not have any of the natural conveniences of cities like London or Paris. People went there for gold. They travelled over snow-covered mountains and sailed hundreds of miles up icy rivers. The path to Dawson was covered with thirty feet of wet snow that could fall without warming. An avalanche(雪崩) once closed the path, killing 63 people. For many who made it to Dawson, however, the rewards were worth the difficult trip. Of the first 20,000 people who dug for gold, 4,000 got rich. About 100 of these stayed rich men for the rest of their lives.
But no matter how rich they were, Dawson was never comfortable. Necessities like food and wood were very expensive. But soon, the gold that Dawson depended on had all been found. The city was crowded with disappointed people with no interest in settling down, and when they heard there were new gold discoveries in Alaska, they left Dawson City as quickly as they had come. Today, people still come and go — to see where the Canadian gold rush happened. Tourism is now the chief industry of Dawson City — its present population is 762.
24. What attracted the early settlers to New York City?
A. Its business culture.
B. Its small population.
C. Its geographical position.
D. Its favourable climate.
25. What do we know about those who first dug for gold in Dawson?
A. Two-thirds of them stayed there.
B. One out of five people got rich.
C. Almost everyone gave up.
D. Half of them died.
26. What was the main reason for many people to leave Dawson?
A. They found the city too crowded.
B. They wanted to try their luck elsewhere.
C. They were unable to stand the winter.
D. They were short of food.
27. What is the text mainly about?
A. The rise and fall of a city.
B. The gold rush in Canada.
C. Journeys into the wilderness.
D. Tourism in Dawson.
【话题解读】这是一篇说明文。文章主要介绍了Dawson这座城市的发展原因、过程与现状。
24.C
【解析】细节理解题。根据文章第一段中Cities usually have a good reason for being where they are, like a nearby port or river. People settle in these places because they are easy to get to and naturally suited to communications and trade. New York City, for example, is near a large harbour at the mouth of the Hudson River.可知，人们选择在河边或港口设城是因为交通方便，便于做生意。而纽约就是在哈德森河口附近的一个大港口，故纽约吸引早期移民的原因是它的地理位置，故C正确。
25.B
【解析】细节理解题。根据文章第二段最后一句Of the first 20,000 people who dug for gold, 4,000 got rich. About 100 of these stayed rich men for the rest of their lives.可知，在最初挖黄金的两万人中有4000人变富有，所以是五分之一的人变富了，故B正确。
26.B
【解析】细节理解题。根据文章最后一段中and when they heard there were new gold discoveries in Alaska, they left Dawson City as quickly as they had come.可知，人们离开Dawson的主要原因是听说在Alaska发现了黄金，也就是他们要去别的地方寻找发财的机会。故B正确。
27.A
【解析】主旨大意题。第一段简要介绍城市发展的原因，引出Dawson这一城市的兴起，第二段介绍了该城市兴起的原因，第三段介绍人们选择离开该城市的原因及现在的状况，所以全文围绕Dawson这个城市的发展起伏。故A正确。
4.【2018·北京卷，C】
Plastic-Eating Worms
Humans produce more than 300 million tons of plastic every year. Almost half of that winds up in landfills(垃圾填埋场), and up to 12 million tons pollute the oceans. So far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms.
Researchers in Spain and England recently found that the worms of the greater wax moth can break down polyethylene, which accounts for 40% of plastics. The team left 100 wax worms on a commercial polyethylene shopping bag for 12 hours, and the worms consumed and broke down about 92 milligrams, or almost 3% of it. To confirm that the worms’ chewing alone was not responsible for the polyethylene breakdown, the researchers made some worms into paste(糊状物) and applied it to plastic films. 14 hours later the films had lost 13% of their mass — apparently broken down by enzymes (酶) from the worms’ stomachs. Their findings were published in Current Biology in 2017.
Federica Bertocchini, co-author of the study, says the worms’ ability to break down their everyday food — beeswax — also allows them to break down plastic. ＂Wax is a complex mixture, but the basic bond in polyethylene, the carbon-carbon bond, is there as well, ＂she explains, ＂The wax worm evolved a method or system to break this bond. ＂
Jennifer DeBruyn, a microbiologist at the University of Tennessee, who was not involved in the study, says it is not surprising that such worms can break down polyethylene. But compared with previous studies, she finds the speed of breaking down in this one exciting. The next step, DeBruyn says, will be to identify the cause of the breakdown. Is it an enzyme produced by the worm itself or by its gut microbes(肠道微生物)?
Bertocchini agrees and hopes her team’s findings might one day help employ the enzyme to break down plastics in landfills. But she expects using the chemical in some kind of industrial process — not simply ＂millions of worms thrown on top of the plastic. ＂
43. What can we learn about the worms in the study?
A. They take plastics as their everyday food.
B. They are newly evolved creatures.
C. They can consume plastics.
D. They wind up in landfills.
44. According to Jennifer DeBruyn, the next step of the study is to .
A. identify other means of the breakdown
B. find out the source of the enzyme
C. confirm the research findings
D. increase the breakdown speed
45. It can be inferred from the last paragraph that the chemical might .
A. help to raise worms
B. help make plastic bags
C. be used to clean the oceans
D. be produced in factories in future
46. What is the main purpose of the passage?
A. To explain a study method on worms.
B. To introduce the diet of a special worm.
C. To present a way to break down plastics.
D. To propose new means to keep eco-balance.
【文章大意】本文为说明文。文章介绍了一种吃塑料的虫子大蜡螟，它胃中的酶能够降解塑料，这为解决塑料污染提供了新的途径。
43.C 【解析】细节理解题。根据文章第三段Federica Bertocchini, co-author of the study, says the worms’ ability to break down their everyday food — beeswax — also allows them to break down plastic. 可知，研究结果发现，蠕虫分解日常食物的能力让它们可以分解塑料，也就是说它们可以消费塑料。故选C。
44.B 【解析】细节理解题。根据文章第四段The next step, DeBruyn says, will be to identify the cause of the breakdown. Is it an enzyme produced by the worm itself or by its gut microbes(肠道微生物)?可知，下一步研究是辨清分解的原因，查明这种酶来源于哪里，是虫子自己产生的还是它肠道里的微生物产生的。故选B。
45.D 【解析】推理判断题。根据文章最后一段But she expects using the chemical in some kind of industrial process — not simply ＂millions of worms thrown on top of the plastic. ＂可以推断出，Bertocchini希望这种化学物质将来能在工业生产中使用，而不是仅仅依靠蠕虫来分解塑料。故选D。
46.C 【解析】写作意图题。根据文章第一段最后一句So far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms. 可知，有一种新的方法被用于分解塑料。再根据最后一段最后一句But she expects using the chemical in some kind of industrial process — not simply ＂millions of worms thrown on top of the plastic. ＂可知，Bertocchini希望将这种方法推广到工业中。由此可以推知写作意图为介绍一种分解塑料的方法。故选C。
5.【2018·天津卷，C】
There’s a new frontier in 3D printing that’s beginning to come into focus: food. Recent development has made possible machines that print, cook, and serve foods on a mass scale. And the industry isn’t stopping there.
Food production
With a 3D printer, a cook can print complicated chocolate sculptures and beautiful pieces for decoration on a wedding cake. Not everybody can do that — it takes years of experience, but a printer makes it easy. A restaurant in Spain uses a Foodini to “re-create forms and pieces” of food that are “exactly the same,” freeing cooks to complete other tasks. In another restaurant, all of the dishes and desserts it serves are 3D-printed, rather than farm to table.
Sustainability(可持续性)
The global population is expected to grow to 9.6 billion by 2050, and some analysts estimate that food production will need to be raised by 50 percent to maintain current levels. Sustainability is becoming a necessity. 3D food printing could probably contribute to the solution. Some experts believe printers could use hydrocolloids (水解胶体) from plentiful renewables like algae(藻类) and grass to replace the familiar ingredients(烹饪原料). 3D printing can reduce fuel use and emissions. Grocery stores of the future might stock "food" that lasts years on end, freeing up shelf space and reducing transportation and storage requirements.
Nutrition
Future 3D food printers could make processed food healthier. Hod Lipson, a professor at Columbia University, said, “Food printing could allow consumers to print food with customized nutritional content, like vitamins. So instead of eating a piece of yesterday’s bread from the supermarket, you’d eat something baked just for you on demand.”
Challenges
Despite recent advancements in 3D food printing, the industry has many challenges to overcome. Currently, most ingredients must be changed to a paste(糊状物) before a printer can use them, and the printing process is quite time-consuming, because ingredients interact with each other in very complex ways. On top of that, most of the 3D food printers now are restricted to dry ingredients, because meat and milk products may easily go bad. Some experts are skeptical about 3D food printers, believing they are better suited for fast food restaurants than homes and high-end restaurants.
46. What benefit does 3D printing bring to food production?
A. It helps cooks to create new dishes.
B. It saves time and effort in cooking.
C. It improves the cooking conditions.
D. It contributes to restaurant decorations.
47. What can we learn about 3D food printing from Paragraphs 3?
A. It solves food shortages easily.
B. It quickens the transportation of food.
C. It needs no space for the storage of food.
D. It uses renewable materials as sources of food.
48. According to Paragraph 4, 3D-printed food _____________.
A. is more available to consumers
B. can meet individual nutritional needs
C. is more tasty than food in supermarkets
D. can keep all the nutrition in raw materials
49. What is the main factor that prevents 3D food printing from spreading widely?
A. The printing process is complicated.
B. 3D food printers are too expensive.
C. Food materials have to be dry.
D. Some experts doubt 3D food printing.
50. What could be the best title of the passage?
A. 3D Food Printing: Delicious New Technology
B. A New Way to Improve 3D Food Printing
C. The Challenges for 3D Food Production
D. 3D Food Printing: From Farm to Table
【文章大意】本文是一篇说明文。文章主要介绍了3D打印技术在食物上的应用取得了进展，但目前仍面临着许多方面的挑战。
46.B
【解析】推理判断题。根据文章Food production中叙述了没有经验的人可以用3D打印机做出复杂的巧克力雕塑和美丽的婚礼蛋糕，以及餐厅能够用3D打印出所有的菜肴和甜点，从而可以推断出3D打印的优势是节省了做饭的时间和精力。故选B。
47.D
【解析】细节理解题。根据文章第三段Some experts believe printers could use hydrocolloids (水解胶体) from plentiful renewables like algae(藻类) and grass to replace the familiar ingredients(烹饪原料).可知，3D打印机可以使用可再生材料作为食物来源。故选D。
48.B
【解析】推理判断题。根据文章第四段Food printing could allow consumers to print food with customized nutritional content, like vitamins.（食品打印可以让消费者打印定制营养的食物），从而可以推断出3D打印出来的食物可以满足个人营养需求。故选B。
49.C
【解析】细节理解题。根据文章最后一段most of the 3D food printers now are restricted to dry ingredients, because meat and milk products may easily go bad.可知，阻止3D打印食物进一步广泛使用的原因是原料必须是干的，含水多的肉和牛奶不能应用于3D打印因为很容易坏。故选C。
50.A
【解析】主旨大意题。文章主要介绍了3D打印技术在食物上的应用取得了进展，但目前仍面临着许多方面的挑战。所以用标题3D Food Printing: Delicious New Technology，故选A。
点睛：科普类说明文历来是高考阅读理解命题的重点。本文是一篇3D打印技术在食物方面的应用，文章运用一些小标题和对一些专业词汇作了多处中文注释，降低了考生的阅读难度。文章逻辑性强，条理清楚，主要考查学生对语篇的整体把握和领悟能力以及对特定细节的认读和处理能力。最后一小题考查主旨大意，为文章选择出最好的标题。考生做此题时一定要注意选择项必须要能概括整个文章的内容，不能以偏概全。如B、C、D选择项在文章中都有所涉及，但不足以概括全文，所以需要考生正确概括全文的主旨大意。
6.【2018·浙江卷，B】
Steven Stein likes to follow garbage trucks. His strange habit makes sense when you consider that he’s an environmental scientist who studies how to reduce litter, including things that fall off garbage trucks as they drive down the road. What is even more interesting is that one of Stein's jobs is defending an industry behind the plastic shopping bags.
Americans use more than 100 billion thin film plastic bags every year. So many end up in tree branches or along highways that a growing number of cities do not allow them at checkouts(收银台) . The bags are prohibited in some 90 cities in California, including Los Angeles. Eyeing these headwinds, plastic-bag makers are hiring scientists like Stein to make the case that their products are not as bad for the planet as most people assume.
Among the bag makers' argument: many cities with bans still allow shoppers to purchase paper bags, which are easily recycled but require more energy to produce and transport. And while plastic bags may be ugly to look at, they represent a small percentage of all garbage on the ground today.
The industry has also taken aim at the product that has appeared as its replacement: reusable shopping bags. The stronger a reusable bag is, the longer its life and the more plastic-bag use it cancels out. However, longer-lasting reusable bags often require more energy to make. One study found that a cotton bag must be used at least 131 times to be better for the planet than plastic.
Environmentalists don't dispute（质疑） these points. They hope paper bags will be banned someday too and want shoppers to use the same reusable bags for years.
24. What has Steven Stein been hired to do?
A. Help increase grocery sales. B. Recycle the waste material.
C. Stop things falling off trucks. D. Argue for the use of plastic bags.
25. What does the word “headwinds”in paragraph 2 refer to?
A. Bans on plastic bags. B. Effects of city development.
C. Headaches caused by garbage. D. Plastic bags hung in trees.
26. What is a disadvantage of reusable bags according to plastic-bag makers?
A. They are quite expensive. B. Replacing them can be difficult.
C. They are less strong than plastic bags. D. Producing them requires more energy.
27. What is the best title for the text?
A. Plastic, Paper or Neither B. Industry, Pollution and Environment
C. Recycle or Throw Away D. Garbage Collection and Waste Control
【文章大意】文章分析了几种购物袋的使用情况，塑料袋造成了环境问题，尽管纸袋容易回收，但生产和运输需要更多的能源，希望消费者使用耐用可重复使用的袋子。
24.D
【解析】细节理解题。根据第一段one of Stein's jobs is defending an industry behind the plastic shopping bags.和第二段plastic-bag makers are hiring scientists like Stein to make the case that their products are not as bad for the planet as most people assume.可知塑料袋生产商雇用Steven Stein是为了证明他们的产品并不像大多数人想象的那样对地球有害，是对塑料袋被禁用的解释和争论。故选D。
25.A
【解析】词义猜测题。上文介绍在许多美国大城市塑料袋被禁用，看到这种现状，塑料袋生产商雇用Steven Stein等科学家是为了证明他们的产品并不像大多数人想象的那样对地球有害。headwinds“逆风”，此处指塑料袋被禁用的现状，即Bans on plastic bags，故选A。
26.D
【解析】细节理解题。根据第四段However, longer-lasting reusable bags often require more energy to make.可知塑料袋生产商认为生产耐用且能重复使用的袋子需要更多的能量，故选D。
27.A
【解析】标题归纳题。文章讲述了使用塑料袋造成的环境问题，纸袋容易回收，但生产和运输需要更多的能源，希望消费者使用耐用可重复使用的袋子。对这三种方式进行了对比，Plastic, Paper or Neither既能概括全文，又能吸引读者，最适合作为标题。故选A。
7.【2018·浙江卷，C】
As cultural symbols go, the American car is quite young. The Model T Ford was built at the Piquette Plant in Michigan a century ago, with the first rolling off the assembly line（装配线）on September 27, 1908. Only eleven cars were produced the next month. But eventually Henry Ford would build fifteen million of them.
Modern America was born on the road, behind a wheel. The car shaped some of the most lasting aspects of American culture: the roadside diner, the billboard, the motel, even the hamburger. For most of the last century, the car represented what it meant to be American—going forward at high speed to find new worlds. The road novel, the road movie, these are the most typical American ideas, born of abundant petrol, cheap cars and a never-ending interstate highway system, the largest public works project in history.
In 1928 Herbert Hoover imagined an America with “a chicken in every pot and a car in every garage.” Since then, this society has moved onward, never looking back, as the car transformed America from a farm-based society into an industrial power.
The cars that drove the American Dream have helped to create a global ecological disaster. In America the demand for oil has grown by 22 percent since 1990.
The problems of excessive（过度的）energy consumption, climate change and population growth have been described in a book by the American writer Thomas L. Friedman. He fears the worst, but hopes for the best.
Friedman points out that the green economy（经济）is a chance to keep American strength. “The ability to design, build and export green technologies for producing clean water, clean air and healthy and abundant food is going to be the currency of power in the new century.”
28. Why is hamburger mentioned in paragraph 2?
A. To explain Americans’ love for travelling by car.
B. To show the influence of cars on American culture.
C. To stress the popularity of fast food with Americans.
D. To praise the effectiveness of America’s road system.
29. What has the use of cars in America led to?
A. Decline of economy. B. Environmental problems.
C. A shortage of oil supply. D. A farm-based society.
30. What is Friedman’s attitude towards America’s future?
A. Ambiguous. B. Doubtful. C. Hopeful. D. Tolerant.
【文章大意】文章讲述了汽车在美国经济和文化上的重要作用，也指出了汽车带来的环境问题。
28.B
【解析】推理判断题。根据第二段Modern America was born on the road, behind a wheel. The car shaped some of the most lasting aspects of American culture: the roadside diner, the billboard, the motel, even the hamburger.可知现代美国诞生于公路和汽车，汽车塑造了美国文化最持久的一些方面。Hamburger就是汽车塑造的美国文化的一个方面。用这个例子是在说明汽车对美国文化的影响，故选B。
29.B
【解析】细节理解题。根据第四段The cars that drove the American Dream have helped to create a global ecological disaster.可知美国汽车的迅速发展，导致生态灾难。故选B。
30.C
【解析】推理判断题。根据倒数第二段中的He fears the worst, but hopes for the best. 和最后一段中的Friedman points out that the green economy（经济）is a chance to keep American strength.可见Friedman虽然对未来担心，但抱有最好的希望，他指出了发展绿色积极的想法。可见Friedman对未来是充满希望的，故选C。
8.【2018·江苏卷，B】
In the 1760s, Mathurin Roze opened a series of shops that boasted(享有) a special meat soup called consommé. Although the main attraction was the soup, Roze's chain shops also set a new standard for dining out, which helped to establish Roze as the inventor of the modern restaurant.
Today, scholars have generated large amounts of instructive research about restaurants. Take visual hints that influence what we eat: diners served themselves about 20 percent more pasta(意大利面食) when their plates matched their food. When a dark-colored cake was served on a black plate rather than a white one, customers recognized it as sweeter and more tasty.
Lighting matters, too. When Berlin restaurant customers ate in darkness, they couldn't tell how much they'd had: those given extra-large shares ate more than everyone else, none the wiser—they didn’t feel fuller, and they were just as ready for dessert.
Time is money, but that principle means different things for different types of restaurants. Unlike fast-food places, fine dining shops prefer customers to stay longer and spend. One way to encourage customers to stay and order that extra round: put on some Mozart(莫扎特).When classical, rather than pop, music was playing, diners spent more. Fast music hurried diners out.
Particular scents also have an effect: diners who got the scent of lavender(薰衣草) stayed longer and spent more than those who smelled lemon, or no scent.
Meanwhile, things that you might expect to discourage spending—"bad" tables, crowding. high prices — don't necessarily. Diners at bad tables — next to the kitchen door, say — spent nearly as much as others but soon fled. It can be concluded that restaurant keepers need not "be overly concerned about ‘bad’ tables," given that they're profitable. As for crowds, a Hong Kong study found that they increased a restaurant's reputation, suggesting great food at fair prices. And doubling a buffet's price led customers to say that its pizza was 11 percent tastier.
58. The underlined phrase "none the wiser" in paragraph 3 most probably implies that the customers were .
A. not aware of eating more than usual
B. not willing to share food with others
C. not conscious of the food quality
D. not fond of the food provided
59. How could a fine dining shop make more profit?
A. Playing classical music.
B. Introducing lemon scent.
C. Making the light brighter,
D. Using plates of larger size.
60. What does the last paragraph talk about?
A. Tips to attract more customers.
B. Problems restaurants are faced with.
C. Ways to improve restaurants' reputation.
D. Common misunderstandings about restaurants.
【文章大意】本文为说明文，介绍了现代餐馆面临的经营困境和解决方案，介绍了刺激消费和食欲的几种方法，以及人们对餐厅就餐的一些错误认识。
58.A
【解析】词义猜测题。根据文章第三段划线部分的前句they couldn't tell how much they'd had: those given extra-large shares ate more than everyone else,可知在黑暗中，他们说不清自己吃了多少，再根据划线后 的句子they didn’t feel fuller, and they were just as ready for dessert.可知他们虽然吃得很多，但并没有感觉更饱，仍然在等着吃甜点，所以他们没有意识到自己吃多了，所以A正确。
59.A
【解析】细节理解题。根据第四段中的One way to encourage customers to stay and order that extra round: put on some Mozart(莫扎特）可知，要想让客人呆的时间更长应该播放莫扎特等古典音乐而不是流行音乐。Particular scents also have an effect: diners who got the scent of lavender(薰衣草）stayed longer and spent more than those who smelled lemon, or no scent.引入薰衣草香而不是柠檬香，而D项文章没有提及，所以用排除方法可以选A。
60.D
【解析】主旨大意题。根据文章最后一段第一句Meanwhile, things that you might expect to discourage spending—"bad" tables, crowding，high prices — don't necessarily.可知你认为可能会影响人们消费的因素如不好的桌子，拥挤以及高价等不一定会真影响人们的消费，然后依次举例进行了证明，所以本段主要讲的是人们对于饭店的几个误解，故选D。
9.【2018·江苏卷，D】
Children as young as ten are becoming dependent on social media for their sense of self-worth, a major study warned.
It found many youngsters(少年）now measure their status by how much public approval they get online, often through “likes”. Some change their behaviour in real life to improve their image on the web.
The report into youngsters aged from 8 to 12 was carried out by Children's Commissioner (专员）Anne Longfield. She said social media firms were exposing children to major emotional risks, with some youngsters starting secondary school ill-equipped to cope with the tremendous pressure they faced online.
Some social apps were popular among the children even though they supposedly require users to be at least 13.The youngsters admitted planning trips around potential photo-opportunities and then messaging friends—and friends of friends — to demand “likes” for their online posts.
The report found that youngsters felt their friendships could be at risk if they did not respond to social media posts quickly, and around the clock.
Children aged 8 to 10 were "starting to feel happy" when others liked their posts. However, those in the 10 to 12 age group were "concerned with how many people like their posts", suggesting a “need” for social recognition that gets stronger the older they become.
Miss Longfield warned that a generation of children risked growing up "worried about their appearance and image as a result of the unrealistic lifestyles they follow on platforms, and increasingly anxious about switching off due to the constant demands of social media.
She said: "Children are using social media with family and friends and to play games when they are in primary school. But what starts as fun usage of apps turns into tremendous pressure in real social media interaction at secondary school."
As their world expanded, she said, children compared themselves to others online in a way that was "hugely damaging in terms of their self-identity, in terms of their confidence, but also in terms of their ability to develop themselves".
Miss Longfield added: "Then there is this push to connect—if you go offline, will you miss something, will you miss out, will you show that you don't care about those people you are following, all of those come together in a huge way at once." "For children it is very, very difficult to cope with emotionally." The Children's Commissioner for England's study—life in Likes—found that children as young as 8 were using social media platforms largely for play.
However, the research—involving eight groups of 32 children aged 8 to 12—suggested that as they headed toward their teens, they became increasingly anxious online.
By the time they started secondary school—at age 11—children were already far more aware of their image online and felt under huge pressure to ensure their posts were popular, the report found.
However, they still did not know how to cope with mean-spirited jokes, or the sense of incompetence they might feel if they compared themselves to celebrities(名人）or more brilliant friends online. The report said they also faced pressure to respond to messages at all hours of the day—especially at secondary school when more youngsters have mobile phones.
The Children’s Commissioner said schools and parents must now do more to prepare children for the emotional minefield(雷区）they faced online. And she said social media companies must also "take more responsibility". They should either monitor their websites better so that children do not sign up too early, or they should adjust their websites to the needs of younger users.
Javed Khan, of children's charity Bamardo's, said: "It's vital that new compulsory age- appropriate relationship and sex education lessons in England should help equip children to deal with the growing demands of social media.
“It’s also hugely important for parents to know which apps their children are using.”
65. Why did some secondary school students feel too much pressure?
A. They were not provided with adequate equipment.
B. They were not well prepared for emotional risks.
C. They were required to give quick responses.
D. They were prevented from using mobile phones.
66. Some social app companies were to blame because .
A. they didn't adequately check their users' registration
B. they organized photo trips to attract more youngsters
C. they encouraged youngsters to post more photos
D. they didn't stop youngsters from staying up late
67. Children's comparing themselves to others online may lead to .
A. less friendliness to each other
B. lower self-identity and confidence
C. an increase in online cheating
D. a stronger desire to stay online
68. According to Life in Likes, as children grew, they became more anxious to .
A. circulate their posts quickly B. know the qualities of their posts
C. use mobile phones for play D. get more public approval
69. What should parents do to solve the problem?
A. Communicate more with secondary schools.
B. Urge media companies to create safer apps.
C. Keep track of children's use of social media.
D. Forbid their children from visiting the web.
70. What does the passage mainly talk about?
A. The influence of social media on children.
B. The importance of social media to children.
C. The problem in building a healthy relationship.
D. The measure to reduce risks from social media.
【文章大意】本文为说明文，主要介绍了社交媒体(social media ) 使得8-12 岁的孩子面临很多压力，并分析了原因，提出了建议。
65.B
【解析】细节理解题。根据文章第三段第二句话She said social media firms were exposing children to major emotional risks, with some youngsters starting secondary school ill-equipped to cope with the tremendous pressure they faced online.可知一些社会媒体公司使孩子们处于大的情感压力下，从而使孩子们感到巨大的压力，故B正确。
66.A
【解析】推理判断题。根据文章第四段第一句话Some social apps were popular among the children even though they supposedly require users to be at least 13.可知一些apps 很受孩子们欢迎，尽管它们要求使用者不低于13岁，言外之意，他们没有对孩子的年龄进行监管，故选A。
67.B
【解析】细节理解题。根据文章第九段children compared themselves to others online in a way that was "hugely damaging in terms of their self-identity, in terms of their confidence, but also in terms of their ability to develop themselves".可知孩子在网上与其他人比较损害他们的自尊心，自信心以及自我发展的能力，故B正确。
68.D
【解析】推理判断题。根据文章第12段However, the research—involving eight groups of 32 children aged 8 to 12—suggested that as they headed toward their teens, they became increasingly anxious online.可知随着孩子年龄的增长，他们开始渴望上网，再根据13段By the time they started secondary school—at age 11—children were already far more aware of their image online and felt under huge pressure to ensure their posts were popular, the report found.可以推断出他们的压力源于他们渴望自己的发帖能受欢迎、被认可，由此可见他们渴望得到公众的认可。故选D。
69.C
【解析】细节理解题。根据文章最后一段It’s also hugely important for parents to know which apps their children are using.可以推断出父母需要了解孩子在使用什么apps，所以应该时刻跟踪了解孩子对于社交app的使用。故选C。
70.A
【解析】主旨大意题。根据文章第一段Children as young as ten are becoming dependent on social media for their sense of self-worth, a major study warned.可知本文为新闻报道体，文章主要介绍teens 变得越来越依赖社交媒体。再根据全文内容可知文章主要介绍了社交媒体对孩子的影响，所以A正确。
点睛：推理判断试题属于高层次阅读理解题。这种题型包括判断题和推理题。这两类题常常相互依存，推理是为了得出正确的判断，正确的判断又依赖于合乎逻辑的推理。做好该题型要从整体上把握语篇内容，在语篇的表面意义与隐含意义、已知信息与未知信息间架起桥梁，透过字里行间，去体会作者的“弦外之音”。推理判断题常常可以分为如下几类：（1）细节推断。如时间、地点、人物关系等；（2）逻辑推断。根据已知的结果推断导致结果产生的可能原因；（3）目的、意图、态度推断。根据文章的论述，推断作者的写作目的以及作者情感态度；（4）预测想象推断。文章没有明确说明，要求根据语篇对文章可能涉及的内容进行预测判断。
本题的第二和第四小题都属于细节推理，解答此类题目首先要准确定位信息句，然后根据信息句进行合理判断，如第二小题根据原文信息Some social apps were popular among the children even though they supposedly require users to be at least 13.中关键信息为even though 后的内容，即尽管他们要求使用者要13岁以上，但在小于13的孩子中仍很受欢迎，说明他们的监管不力。
再如第四小题也属于细节推理题。根据文章第12段However, the research—involving eight groups of 32 children aged 8 to 12—suggested that as they headed toward their teens, they became increasingly anxious online.可知随着孩子年龄的增长，他们开始渴望上网，再根据13段By the time they started secondary school—at age 11—children were already far more aware of their image online and felt under huge pressure to ensure their posts were popular, the report found.可以推断出他们的压力源于他们渴望自己的发帖能受欢迎，被认可，由此可见他们渴望得到公众的认可。