Question

In 1985, scientists reported a change in the atmosphere, a hole or thinning of ozone（臭氧层）over Antarctica. Scientists were not sure what was causing.

Most scientists believe that man-made chemicals are destroying the ozone. They also have found signs of ozone loss in other parts of the atmosphere.

Ozone is found both in the air we breathe and in the upper atmosphere. Near the earth, ozone in the air is a danger to life. It is a waste product. But ozone found 10 to 50 kilometers up in the atmosphere protects life on earth.  Ozone is formed in the atmosphere through the action of solar radiation. Once formed, the ozone blocks harmful radiation from reaching the earth. Scientists say a reduction in ozone and an increase in the harmful radiation will cause many more cases of skin cancer and will harm crops, animals and fishes.

The report said it is about 8 degrees colder 15 kilometers above earth than it was in 1979. Scientists think the first loss of ozone reduces the amount of solar energy the atmosphere can take in. This cools the atmosphere, increases ice cloud production and leads to more ozone loss.

Scientists found signs the ozone problem has spread. The study shows that the loss of ozone over the areas with larger population in North America and Europe was at least three times greater than scientists had thought. The ozone levels reduced much more seriously during winter months than in warmer months. This is not surprising because the amount of ozone in the atmosphere changes with the temperature.

An international effort is being made to stop the loss of ozone in the atmosphere. But many experts fear that the effort will not produce results fast enough to prevent harm to life on the earth.

1. The text is mainly about_______.

A. a change in atmosphere    　　　　　　　　　　 B. the solar radiation

C. the ozone problem　　　　　　　　　　　　　　　　 D. a hole in Antarctica

2. According to the text, which of the following statements is true?

A. Ozone in the atmosphere is a danger to life.

B. Since ozone in the air is harmful to life, the less ozone in the atmosphere the better.

C. Ozone is a kind of man-made chemical product.

D. The ozone up above us can stop harmful radiation from getting to the earth.

3. The loss of ozone may be caused by the following conditions except for_______.

A. the amount of solar energy　　　　　　　　　　　　    B. the colder temperature

C. the larger population　　　　　　　　　　　　　　  D. man-made chemicals

4. From the text we have learned that_______.

A. the scientists have done a great deal to stop getting warm on the earth

B. the temperature in 1979 was much colder than it is now

C. ozone holds solar energy and helps atmosphere take it in

D. successful efforts have been made to stop the loss of the ozone

5. This text mostly wants to_______.

A. draw people’s interest in atmosphere

B. call the public attention to ozone problem

C. help people to know the change in air

D. make people know the information above us

 

Answer 1

答案：C;D;A;C;B
提示：

1. 通读全文可知文章是关于C臭氧层问题的。 2.  由Once formed, the ozone blocks harmful radiation from reaching the earth.可知D正确。 3. 注意题干是except for. 4. 参见原文第2段。 5. 本题考查作者意图，作者是在号召公众关注臭氧层问题。