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This paper focuses on the potential impact of air pollution.Is it worth the progress of human civilization at the cost of air pollution?

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People used to think that air pollution only affected areas with factories and heavy car traffic around big cities.At present,we realize that although these are the areas with the worst air pollution,the problem is literally worldwide.On several occasions over the past decade,a heavy cloud of air pollution has covered the east of the United States and brought health warnings in rural areas away from any major concentration of manufacturing and automobile traffic.

In fact,the very climate of the entire earth may be infected by air pollution.Some scientists,consider that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels(coal and oil)is creating a"greenhouse effect"-conserving heat reflected from the earth and raising the world′s average temperature.If this view is correct and the world′s temperature is raised only a few degrees,much of the polar ice cap will melt and cities such as New York,Boston,Miami,and New Orleans will be in water.

Another view,less widely held,is that increasing particular matter in the atmosphere is bloc-king sunlight and lowering the earth′s temperature--a result that would be equally disastrous.A drop of just a few degrees could create something close to a new ice age,and would make agriculture difficult or impossible in many of our top farming areas.Today we do not know for sure that either of these conditions will happen(though one recent government report drafted by experts in the field concluded that the greenhouse effect is very possible).Perhaps,if we are lucky enough,the two tendencies will offset each other and the world′s temperature will stay about the same as it is now.

Driven by economic profit,people neglect the damage on our environment caused by the"advanced civilization".Maybe the air pollution is the price the human beings have to pay for their develop-ment.But is it really worthwhile?

1、As pointed out at the beginning of the passage,people used to think that air pollution__.

A.caused widespread damage in the countryside

B.affected the entire eastern half of the United States

C.had damaged effect on health

D.existed merely in urban and industries areas

參考答案：D

參考解析：根據(jù)People used to think that air pollution only affected areas with factories and heavy car traffic around big cities.

2、As to the greenhouse effect，the author__.

A.shares the same view with the scientists

B.is uncertain of its occurrence

C.rejects it as being ungrounded

D.thinks that it will desuoy the world soon

參考答案：B

參考解析：根據(jù)Today we do not know for sure that either of these conditions will happen.

3、The word“offset”in the second paragraph could be replaced by__.

A.slip into

B.make up for

C.set up

D.catch up with

參考答案：A

參考解析：根據(jù)and the world's temperature will stay about the same as it is now.可知offset意思是抵消

4、It carl be concluded that__.

A.raising the world’s temperature only a few degrees would not do much harm to life on earth

B.lowering the world’s temperature merely a few degrees would lead many major farming areas to disaster

C.almost no temperature variations have occurred over the past decade

D.the world’s temperature will remain constant in the years to come

參考答案：B

參考解析：A drop of just a few degrees could create something close to a new ice age,and would make agriculture difficult or impossible in many of our top farming areas.

5、This passage is primarily about__.

A.the greenhouse effect

B.the burning of fossil fuels

C.the potential effect of air pollution

D.the likelihood of a new ice age

參考答案：B

參考解析：這篇短文主要講了空氣污染的潛在影響。

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