Question

There was one thought that air pollution affected only the area immediately around large cities with factories and heavy traffic．At present, we realize that although these are the areas with the worst air pollution, the problem is really 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 distant areas away from any industrial cities．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”—— keeping 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 blocking 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．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 profits, people ignore 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 development．But is it really worth-while?

1. 1.
   People used to think that air pollution_________
   1. A.
      caused widespread damage in the countryside
   2. B.
      affected the entire eastern half of the United States
   3. C.
      had a very bad effect on health
   4. D.
      existed merely in urban and industrial areas
2. 2.
   As to the greenhouse effect, the author_________
   1. A.
      shares the same view with the scientists．
   2. B.
      is uncertain of its occurrence
   3. C.
      rejects it as being ungrounded
   4. D.
      thinks that it will destroy the world soon
3. 3.
   The underlined word “offset” in the second paragraph could be replaced by_______
   1. A.
      counter-act
   2. B.
      break from
   3. C.
      get along
   4. D.
      communicate
4. 4.
   This passage is primarily about________
   1. A.
      the greenhouse effect
   2. B.
      the burning of fossil fuels
   3. C.
      the potential effect of air pollution
   4. D.
      the possibility of a new ice age

Answer 1

DBAC
試題分析：
1.根據(jù)There was one thought that air pollution affected only the area immediately around large cities with factories and heavy traffic，故選D。
2.根據(jù)Today we do not know for sure that either of these conditions will happen.以及全文內(nèi)容故選B。
3.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，故選A
4.結(jié)合全文內(nèi)容，可知這篇短文主要講了空氣污染的潛在影響，故選C
考點(diǎn)：本文為一篇議論文。
點(diǎn)評：本文說明了這篇短文主要講了空氣污染的潛在影響。并且提出了這樣一個問題：人類文明的進(jìn)步要以空氣被污染為代價，這是否值得？答題前先閱讀問題，然后帶著問題，讀全文，找出答題所需要的依據(jù)，完成閱讀。