必修2 Unit3 Computers（核心素养过关练）-2021年高考英语一轮复习学与练

必修2 Unit3 Computers
基础练
Ⅰ.单词拼写
1. As soon as we arrived on the island we were eager to explore.
2. She set a goal for herself to lose 5 pounds this month.
3. We are all persuaded by his logical argument. It’s quite reasonable.
4. He used to download information from the Internet and made good use of it.
5. Generosity is part of the American character.
6. Credit cards have brought about a revolution in people’s spending habits.
7. Jane was typing a report carefully when someone knocked at the door.
8. Tom has been looking forward to becoming a lawyer and his dream has been turned into reality
9. It’s impossible for my brother to finish the task, but anyhow (不管怎样), he wants to have a try.
10. Jack equals his brother in strength but not in intelligence (智力).He is slower in thinking.
11. The poor man signaled (发信号) wildly for help, but no one noticed him.
12. They get along with each other quite well though their personalities are totally/completely/ entirely (完全) different.

Ⅱ.单句填空
1. Lucy tried to keep up a calm appearance (appear), but her trembling voice gave her away.
2. Any applicant who would like to apply to become an assistant in our company should send us an application before May 10,2020.(apply)
3. As far as I know, the problem is difficult to solve. The team are working hard to analyze it so that they can find the best solution. (solve)
4. After the president made an official announcement, she expressed her personal opinion. Personally speaking, I agreed with what she said. (person)
5. There were about 40 people at the party in total, they sang and danced with abandon, totally forgetting the troubles in their lives.(total)
6. He believes that all children are born with equal intelligence. And he thinks that this slow boy can be as intelligent as others if taught properly.(intelligent)
7. Try to simplify your explanation to the students to help them understand better. They are so young that they can understand simple questions.(simply)
8. A number of buildings arose (arise) where there was nothing a year ago but ruins.
9. As an operator (operate), Rosy has to answer many calls from all over the country every day.
10. She is still financially (financial) dependent on her parents.
11. (Having been) Simplified (simplify) several times, the poem written by Shakespeare is easy for readers to read.
12. Never simply judge a person by his appearance (appear), for there is another kind of beauty that comes from the heart.
13. Though body movements may mean different things in different cultures, a smile is universally (universal) accepted as a sign of happiness or being friendly.

Ⅲ.短语检测
1. When he found himself watched over (监视) by someone, he walked into a restaurant quickly and escaped by the back door.
2. She is used to deal with (与……打交道) all kinds of people in her job.
3. When I am back to school from sick leave, I will make up (补上) the missed lessons.
4. Compared with/to (与……相比) his old house, Tom’s new one is like a huge palace.
5. 5.I made great progress in English with the help of (在……的帮助下) Mr Lin.
6. Don’t blame him for breaking the vase; after all (毕竟) he is only a boy of six.
7. Three months went by (过去了) before I knew about it.
8. From then on (从那时起), I have learned to help others and turn to others for help when in trouble.
9. The twins have a lot in common (有很多相同之处) in appearance but (have) little (in common) (几乎没有相同之处) in characters.
10. We are in a way (在某种程度上) doing animals harm by making them live in a human environment.
11. There have been so many conflicts in the world recently. As a result (因此；所以), people are concerned about the world peace.

Ⅳ.重点句型
1. Over time the memory of the computer has developed (develop) so much that it never forgets anything that it has been told.
2. It took several months before the bridge was built (这座桥才建成).
3. Mr Thomas, with whose help I have made great progress in my English, is thought highly of by us students.
4. People all over the world believe that it won’t be long before a cure for cancer comes into being.
5. His dream of becoming a football star faded out as time went by/with time going by(随着时间流逝).
6. Some universities are large that (如此大……以至于) they have their own bus systems.

Ⅴ.课文语法填空
I, the computer, began as a 1. calculating (calculate) machine to simplify difficult sums in 1642 in France. It took nearly 200 years 2.before I was built as an analytical machine, which was a 3. technological (technology) revolution. I became a “universal machine” in 1936 4.to solve (solve) mathematical problems. From then on, I grew rapidly both in size 5. and in brainpower. As time went by, I 6.was connected (connect) with other computers by a network. As a result, I was able to share my knowledge with others 7.through the World Wide Web.
I have been 8.widely (wide) used in many fields, and many new 9.applications (apply) have been found for me, such as in communication, finance and trade. Also I 10. have been put (put) into space rockets to explore the Moon and Mars. I hope to achieve my goal of providing humans with a life of high quality.


必修2 Unit3 Computers
提升练
I. 阅读理解
A
【2019全国I卷】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.
【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。
1. 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.
【答案】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。
2. 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.
【答案】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。
3. 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.
【答案】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。
4. Where is this text most likely from?
A. A diary. B. A guidebook C. A novel. D. A magazine.
【答案】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。
B
【2019湖北省八校高三第二次联考】In 2015, a man named Nigel Richards memorized 386,000 words in the entire French Scrabble Dictionary in just nine weeks. However, he does not speak French. Richards’ impressive feat is a useful example to show how artificial intelligence works—real AI. Both Richards and AI take in massive amounts of data to achieve goals with unlimited memory and superman accuracy in a certain field.
The potential applications for AI are extremely exciting. Because AI can outperform humans at routine tasks—provided the task is in one field with a lot of data—it is technically capable of replacing hundreds of millions of white and blue collar jobs in the next 15 years or so.
But not every job will be replaced by AI. In fact, four types of jobs are not at risk at all. First, there are creative jobs. AI needs to be given a goal to optimize. It cannot invent like scientists, novelists and artists can. Second, the complex, strategic jobs—executives, diplomats, economists—go well beyond the AI limitation of single-field and Big Data. Then there are the as-yet-unknown jobs that will be created by AI.
Are you worried that these three types of jobs won’t employ as many people as AI will replace? Not to worry, as the fourth type is much larger: jobs where emotions are needed, such as teachers, nannies and doctors. These jobs require compassion, trust and sympathy—which AI does not have. And even if AI tried to fake it, nobody would want a robot telling them they have cancer, or a robot to babysit their children.
So there will still be jobs in the age of AI. The key then must be retraining the workforce so people can do them. This must be the responsibility not just of the government, which can provide funds, but also of corporations and those who benefit most.
【文章大意】 本文是一篇说明文,介绍了人工智能给人类带来了惊喜和挑战,挑战主要体现在人工智能将在重复性工作上取代人类劳动力,但在大量需要创造性的工作领域,人工智能还无法胜任,因此人类无须过度恐慌。
5. What is the main purpose of Paragraph 1?
A. To introduce the topic.
B. To mention Nigel’s feat.
C. To stress the importance of good memory.
D. To suggest humans go beyond AI in memory.
【答案】A
【解析】推理判断题。根据第一段内容,特别是“Both Richards and AI take in massive amounts of data to achieve goals with unlimited memory and superman accuracy in a certain field.”可知,理查兹和人工智能都需要运用某一领域的无限内存和超人般的准确性来吸收大量的数据以实现目标,由此可知第一段就是为了引出人工智能这一话题。故A项正确。
6. Which of the following best explains the underlined word “outperform” in Paragraph 2?
A. Be superior to. B. Be equal to. C. Be similar to. D. Be related to.
【答案】A
【解析】词义猜测题。根据画线词后的“…humans at routine tasks—provided the task is in one field with a lot of data—it is technically capable of replacing hundreds of millions of white and blue collar jobs in the next 15 years or so.”可知,AI在数据处理方面优于人类,能在未来15年左右取代很多白领和蓝领的工作。由此可知,画线词意为“优于,胜过”,故A项正确。
7. Which of the following jobs is most likely to be replaced?
A. The writer. B. The shop assistant.
C. The babysitter. D. The psychologist.
【答案】B
【解析】推理判断题。根据第三、四、五段内容可知,AI在重复性工作上可以取代人类,但在创造性和投入感情的工作上无法取代,writer(作家)属于创造性工作,psychologist(心理学家)和babysitter(临时保姆)是需要投入感情的工作。故B项(商店售货员)正确。
8. What does the text suggest people do about job replacement of AI?
A. Limit the application of AI to a certain degree.
B. Get more support from the government.
C. Apply for the donation from companies.
D. Upgrade themselves all the time.
【答案】D
【解析】推理判断题。根据最后一段“The key then must be retraining the workforce so people can do them.”可推知,面对AI取代人类工作的现象,人类所能做的事情就是不断提升自己,故D项正确。
C
【2020成都市高中毕业班摸底测试】 Self-driving cars have been backed by the hope that they will save lives by getting involved in fewer crashes with fewer injuries and deaths than human-driven cars. But so far, most comparisons between human drivers and automated vehicles have been unfair.
Crash statistics for human-driven cars are gathered from all sorts of driving situations, and on all types of roads. However, most of the data on self－driving cars’ safety have been recorded often in good weather and on highways, where the most important tasks are staying in the car’s own lane and not getting too close to the vehicle ahead. Automated cars are good at those tasks, but so are humans.
It is true that self-driving cars don’t get tired, angry, frustrated or drunk. But neither can they yet react to uncertain situations with the same skill or anticipation of an attentive human driver. Nor do they possess the foresight to avoid potential perils. They largely drive from moment to moment, rather than think ahead to possible events literally down the road.
To a self-driving car, a bus full of people might appear quite similar to an uninhabited cornfield. Indeed, deciding what action to take in an emergency is difficult for humans, but drivers have sacrificed themselves for the greater good of others. An automated system’s limited understanding of the world means it will almost never evaluate(评估) a situation the same way a human would. And machines can’t be programmed in advance to handle every imaginable set of events.
Some people may argue that the promise of simply reducing the number of injuries and deaths is enough to support driverless cars. But experience from aviation(航空) shows that as new automated systems are introduced, there is often an increase in the rate of disasters.
Therefore comparisons between humans and automated vehicles have to be performed carefully. To fairly evaluate driverless cars on how well they fulfill their promise of improved safety, it’s important to ensure the data being presented actually provide a true comparison. After all, choosing to replace humans with automation has more effects than simply a one-for-one exchange.
【语篇解读】自动驾驶汽车一直被推崇，人们希望通过这些汽车以减少带来的交通伤亡。但是目前大多数人类司机和自动化汽车之间的比较是不公平的，我们应该综合考虑各种因素，确保收集的数据的可比较性，从而真实、客观地评价自动驾驶汽车。
9. What makes the comparison between self-driving cars and human-driven cars unfair?
A. Self-driving cars never get tired.
B. Statistics are collected differently.
C. Machines can make decisions faster.
D. Self－driving cars know the world better.
【答案】B
【解析】考查细节理解。根据第一段最后一句及第二段第一、二句的内容可知，人类驾驶汽车和自动驾驶汽车的碰撞事故的数据收集情况不同，不能公平比较，故选B。
10. In which aspect can self-driving cars beat human-driven cars?
A. Driving steadily. B. Climbing steep slopes.
C. Evaluating the cost of loss. D. Making complex decisions.
【答案】A
【解析】考查推理判断。根据第三段第一句“It is true that self－driving cars don’t get tired, angry, frustrated or drunk”可推知，在驾驶稳定性方面，自动驾驶汽车胜过人类驾驶汽车，故选A。
11. Why does the author write this text?
A. To support human-driven cars.
B. To show his doubt about self-driving cars.
C. To call for exact evaluation of self-driving cars.
D. To stress the importance of reducing car accidents.
【答案】C
【解析】考查主旨大意。根据最后一段中的“To fairly evaluate driverless cars... actually provide a true comparison”并结合文章其他内容可知，作者写这篇文章的目的是呼吁人们对自动驾驶汽车作出准确的评价。
D
【2017北京卷】 Hollywood’s theory that machines with evil(邪恶) minds will drive armies of killer robots is just silly. The real problem relates to the possibility that artificial intelligence(AI) may become extremely good at achieving something other than what we really want. In 1960 a well-known mathematician Norbert Wiener, who founded the field of cybernetics(控制论), put it this way: “If we use, to achieve our purposes, a mechanical agency with whose operation we cannot effectively interfere(干预), we had better be quite sure that the purpose put into the machine is the purpose which we really desire.”
A machine with a specific purpose has another quality, one that we usually associate with living things: a wish to preserve its own existence. For the machine, this quality is not in-born, nor is it something introduced by humans; it is a logical consequence of the simple fact that the machine cannot achieve its original purpose if it is dead. So if we send out a robot with the single instruction of fetching coffee, it will have a strong desire to secure success by disabling its own off switch or even killing anyone who might interfere with its task. If we are not careful, then, we could face a kind of global chess match against very determined, super intelligent machines whose objectives conflict with our own, with the real world as the chessboard.
The possibility of entering into and losing such a match should concentrate the minds of computer scientists. Some researchers argue that we can seal the machines inside a kind of firewall, using them to answer difficult questions but never allowing them to affect the real world. Unfortunately, that plan seems unlikely to work: we have yet to invent a firewall that is secure against ordinary humans, let alone super intelligent machines.
Solving the safety problem well enough to move forward in AI seems to be possible but not easy. There are probably decades in which to plan for the arrival of super intelligent machines. But the problem should not be dismissed out of hand, as it has been by some AI researchers. Some argue that humans and machines can coexist as long as they work in teams—yet that is not possible unless machines share the goals of humans. Others say we can just “switch them off” as if super intelligent machines are too stupid to think of that possibility. Still others think that super intelligent AI will never happen. On September 11, 1933, famous physicist Ernest Rutherford stated, with confidence, “Anyone who expects a source of power in the transformation of these atoms is talking moonshine.” However, on September 12, 1933, physicist Leo Szilard invented the neutron-induced (中子诱导) nuclear chain reaction.
【文章大意】本文主要介绍了人工智能，它会给我们的生活带来什么样的影响。
12. Paragraph 1 mainly tells us that artificial intelligence may ________.
A. run out of human control B. satisfy human’s real desires
C. command armies of killer robots D. work faster than a mathematician
【答案】A
【解析】推理判断题。根据第一段The real problem relates to the possibility that artificial intelligence (AI) may become extremely good at achieving something other than what we really want.可知人工智能可能会出现的真正问题是AI会非常擅长取得某个成就而不是我们真正想要的东西，也就是说AI可能会超出人的控制去做一些事情，故选A。
13. Machines with specific purposes are associated with living things partly because they might be able to ________.
A. prevent themselves from being destroyed B achieve their original goals independently
C. do anything successfully with given orders D. beat humans in international chess matches
【答案】A
【解析】推理判断题。根据第二段第一句A machine with a specific purpose has another quality, one that we usually associate with living things: a wish to preserve its own existence.可知，原因是保护它自己的存在的一种愿望，也就是说，它具有有生命的物体的一种品质是因为它要保护自己不被破坏，继续存在下去，故选A。
14. According to some researchers, we can use firewalls to __________.
A. help super intelligent machines work better B. be secure against evil human beings
C. keep machines from being harmed D. avoid robots’ affecting the world
【答案】D
【解析】推理判断题。根据第三段using them to answer difcult questions but never allowing them to afect the real world.可知可以用防火墙来回答那些困难的问题但是却永远不要让他们影响这个真正的现实世界，故选D.
15. What does the author think of the safety problem of super intelligent machines?
A. It will disappear with the development of AI. B. It will get worse with human interference.
C. It will be solved but with difficulty. D. It will stay for a decade.
【答案】C
【解析】推理判断题。根据最后一段Solving the safety problem well enough to move forward in AI seems to be possible but not easy.可知作者认为解决人工智能机器的安全问题是可能的，但是并不容易，也就是很困难,故选C。
Ⅱ. 阅读七选五
【2016全国I卷】Secret codes(密码)keep messages private. Banks, companies, and government agencies use secret codes in doing business, especially when information is sent by computer.
People have used secret codes for thousands of years. 16 Code breaking never lags (落后) far behind code making. The science of creating and reading coded messages is called cryptography.
There are three main types of cryptography. 17 For example, the first letters of “My elephant eats too many eels” Spell out the hidden message “Meet me.”
18 You might represent each letter with a number, for example. Let’s number the letters of the alphabet, in order, from 1 to 26. If we substitute a number for each letter, the message “Meet me” would read “13 5 20 13 5.”
A code uses symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book. 19 For example, “bridge” might stand for “meet” and “out” might stand for “me.” The message “bridge out” would actually mean “Meet me.” 20 However, it is also hard to keep a code book secret for long. So codes must be changed frequently.
A. It is very hard to break a code without the code book.
B. In any language, some letters are used more than others.
C. Only people who know the keyword can read the message.
D. As long as there have been codes, people have tried to break them.
E. You can hide a message by having the first letters of each word spell it out.
F. With a code book, you might write down words that would stand for other words.
G. Another way to hide a message is to use symbols to stand for specific letters of the alphabet.
【答案】16-20 DEGFA
【解析】本文是一篇说明文，主要介绍了密码的设置方法和破解的方法。
16. D根据后句内容可以判断该空应该和密码的破译有关，故判断D项内容符合语境逻辑，可以承接上下文。
17. E后面举的例子是来证明人们设置密码时往往会利用一些单词的第一个字母来作为密码，由此判断E选项内容符合语境逻辑。
18. G根据后面的解释内容可以判断这是个绍密码设置的又一种方法，故判断G选项符合语境。
19. F根据后面的举例以及前句中的a code book可以判断该句是介绍密码书的使用，故判断F选项可以起到承上启下的作用。
20. A根据空后内容的转折可知尽管利用密码书可以破译密码，但是一 本密码书也不会使用很久的时间，故判断A选项符合语境。

Ⅲ.完形填空
【2020山东省胶东示范校高三检测】 Rarely do teachers know whether they make permanent impressions on students. I know because it 21 to my mother, a retired teacher, when she turned on the 22 one morning in 2003.
The story began in the mid­1960s. My mom was teaching 23 at Burlingame Junior High. I knew little about her job at the time except for the 24 redhead, Tamara, who was 25 writing stories as a seventh­grader in my mom’s class.
I was visiting her in 2003 when my mom came out of her room with a 26 look on her face. She’d been listening to the radio, and she had 27 an interview with a best­selling French author, Tamara Pierce. My mother 28 ： Could it be the same person?
I 29 the Internet and quickly found the website for the author. My heart began to beat rapidly when I 30 it at the bottom!
“I should 31 my writing career to my English teacher. (Bless you, Mrs. Jacobsen！)”
My mother’s name was Mary Jacobsen.
My mother’s immediate response to this 32 was quiet. She was always kind and extremely 33 , I mention this story not only because it’s a wonderful 34 of the influence teachers can have without being 35 of it. It also makes me see my mom differently.
21. A. fell B. appealed C. happened D. applied
22. A. radio B. television C. computer D. heat
23. A. French B. Spanish C. Italian D. English
24. A. amazed B. excited C. gifted D. bored
25. A. respectful of B. skilled at C. uninterested in D. surprised at
26. A. puzzled B. worried C. tired D. satisfied
27. A. conducted B. arranged C. received D. heard
28. A. shouted B. repeated C. wondered D. sighed
29. A. went into B. looked into C. checked D. searched
30. A. spotted B. recorded C. seized D. realized
31. A. return B. adapt C. owe D. show
32. A. doubt B. creation C. event D. discovery
33. A. modest B. outgoing C. sympathetic D. faithful
34. A. victory B. example C. topic D. stage
35. A. worthy B. certain C. aware D. proud
【答案】21-25 CADCB 26-30 ADCDA 31-35 CDABC
【解析】本文为记叙文。作者借母亲的经历说明：尽管教师很少知道他们是否会对学生产生深远的影响，但事实是他们的确在无声中影响着学生。
21. C 根据上下文可知，这里指的是这种情况发生(happened)在了妈妈身上。fall to“(职责、责任)落在……身上”；appeal to“上诉，吸引，呼吁”；apply to“申请，适用，涉及”。
22. A 根据第三段中的“She'd been listening to the radio”可知，此处应用radio。
23. D 根据下文内容尤其是11空后的信息“my English teacher”可知，妈妈教的是英语。
24. C 根据该句中的“writing stories as a seventh­grader in my mom's class”和下文可知，Tamara后来成了畅销书作者，并将自己在写作上的成功归功于自己的老师，可见，当初她应该是一位在写作上有天赋的(gifted)学生。amazed“惊奇的”；excited“激动的”；bored“厌倦的，烦闷的”。
25. B 本空填入的词应与4空一样用于描写Tamara的写作天赋，故用skilled at“精于……的”。respectful of“尊重……”；uninterested in“对……不感兴趣”；surprised at“对……感到惊讶”。
26. A 根据第三段信息可知，妈妈通过广播听到(heard)了对一个名叫 Tamara Pierce的法国畅销书作者的采访，而这位作者的名字恰好与妈妈以前教过的一个学生同名，所以妈妈走出房间时脸上流露出困惑的(puzzled)表情，心想(wondered)：这会是同一个人吗？worried“担心的”；tired“疲倦的”；satisfied“满意的”。
27. D 参见上题解析。conduct“组织，指挥，引导，举止”；arrange“安排，布置，谱写”；receive“收到，体验，招待，接纳”。
28. C 参见第6题解析。shout“大声说，嚷”；repeat“重复”；sigh“叹气，叹息”。
29. D 根据语境可知，作者上网搜索(searched)相关信息。go into“进入，从事”；look into“调查”；check“检查，核实，控制，寄放”。
30. A 当在网页底端看见(spotted)这句话时，作者的心跳加快了。record“记录，录音”；seize“抓住，攻占，没收”；realize“意识到，实现”。
31. C 此处指的是“我的写作生涯都归功于(owe)我的英语老师(感谢您，Mrs. Jacobsen！)”。return“回来，放回，恢复”；adapt“适应，改写”；show“表明，展示，指出，引领”。
32. D 根据语境可知，妈妈对作者的这一发现(discovery)显得很平静。doubt“疑惑，疑问”；creation“创造，作品”；event“大事，比赛项目，公开活动”。
33. A 此处填入的词应与前一句的quiet和本句的kind在情感基调上保持一致，故用modest。妈妈总是很友善，非常谦虚(modest)。
34. B 妈妈的经历就是一个很好的例子(example)。victory“胜利，成功”；topic“话题，标题”；stage“阶段，步骤，舞台，戏剧”。
35. C 根据第一段首句“Rarely do teachers know whether they make permanent impressions on students”可知答案。 be aware of“知道，意识到”符合语境。be worthy of“值得”；be certain of“确信”；be proud of“为……自豪”。