Unit 3 Environmental Protection Learning about Language 课件＋练习（教师版＋学生版）

Unit 3 Environmental Protection Learning about Language课时练习（原卷版）

一、根据中文意思完成句子。

1. Without the           （改革）of the economic management system our industry will rot.
2. If you do this，you'll almost always meet your           （年度的）goal.
3. The submarine that our country has put into use is driven by           （核能的）power.
4. Every time I mention her, you become very           （敏感的）.
5. During the war we had just enough food to           （维持）us.
6. After the failure of the electricity supply the city was in           （混乱）.
7. He           （提交）his proposal for urban development to the city council at the conference.
8. In the meeting he spoke            all the members of the company.（代表）
9. He always takes the lead            the government's call.（对…的回应）
10. The only way they can           political change is to put pressure on the country.（带来）

二、阅读理解。

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.

1. 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.

2. 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.

3. 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.

4. 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.

三、完形填空。

Molai grew up in a tiny village in India. The village lay near some wetlands which became his second 1 . He learned the value and beauty of 2 there from a very young age.

When he was 16, Molai began to notice something 3 happening around his home. A flood had hit the area earlier that year and the 4 it caused had driven away a number of birds. 5 , the number of snakes had declined as well. He 6 that it was because there weren’t enough trees to protect them from the 7 . The solution, of course, was to plant trees so the animals could seek 8 during the daytime. He turned to the 9 department for help but was told that nothing would grow there. However, Molai went looking on his own and 10 a nearby island where he began to plant trees.

11 young plants in the dry season was 12 for a lone boy. Molai built at the 13 of each sapling(幼树)a bamboo platform, where he placed earthen pots with small holes to 14 rainwater. The water would then drip(滴落)on the plants below.

Molai 15 to plant trees for the next 37 years, His efforts have resulted in 1,360 acres of naturally-grown land that has become home to many plants and animals.

1. A. dream B. job C. home D. choice

2. A. nature B. youth C. culture D. knowledge

3. A. precious B. interesting C. disturbing D. awkward

4. A. waste B. tension C. pain D. damage

5. A. Besides B. However C. Therefore D. Otherwise

6. A. agreed B. realized C. remembered D. predicted

7. A. noise B. heat C. disease D. dust

8. A. directions B. partners C. help D. shelter

9. A. labor B. police C. forest D. finance

10. A. rebuilt B. discovered C. left D. managed

11. A. Decorating B. Observing C. Watering D. Guarding

12. A. tough B. illegal C. fantastic D. beneficial

13. A. back B. top C. foot D. side

14. A. cool down B. keep off C. purify D. collect

15. A. returned B. learned C. failed D. continued

四、语法填空。

Global warming is having a great effect on hundreds of species around the world．No one knows（1）        （exact） what will happen in the future （2）         global warming continues．As the Earth becomes（3）         （warm），weather will become more unpredictable．Increased temperatures will cause the polar ice to melt，raising sea level and （4）        （result） in more floods．The sea level （5）

        （rise） six to eight inches in the past 100 years．Hurricanes will be more（6）        （power） and animals （7）         require colder climates will be forced to move to other areas or will become（8）        （endanger）． So far，efforts （9）         （cut） emissions of greenhouse gases have been made and there are many things we can do．For example，use less energy （10）       

 turning off lights，TVs，computers and other appliances when they are not used．