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    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?
    小题1: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 a very bad effect on health
    D．existed merely in urban and industrial areas
    小题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 destroy the world soon
    小题3:The underlined word “offset” in the second paragraph could be replaced by_______.
    A．counter-actB．break fromC．get alongD．communicate
    小题4:This passage is primarily about________ .
    A．the greenhouse effect
    B．the burning of fossil fuels
    C．the potential effect of air pollution
    D．the possibility of a new ice age

    小题1:D
    小题2:B
    小题3:A
    小题4:C

    试题分析：
    小题1:根据There was one thought that air pollution affected only the area immediately around large cities with factories and heavy traffic，故选D。
    小题2:根据Today we do not know for sure that either of these conditions will happen.以及全文内容故选B。
    小题3:根据and the world's temperature will stay about the same as it is now．可知offset意思是抵消，故选A
    小题4:结合全文内容，可知这篇短文主要讲了空气污染的潜在影响，故选C
    点评：本文说明了这篇短文主要讲了空气污染的潜在影响。并且提出了这样一个问题：人类文明的进步要以空气被污染为代价，这是否值得？答题前先阅读问题，然后带着问题，读全文，找出答题所需要的依据，完成阅读。
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    B．were divided into the three groups
    C．received standard treatments
    D．suffered little side effects
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