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  3. There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automob

There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automob

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问题     There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic. 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 degree, much of the popular 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 degree 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’re lucky enough, the two tendencies will offset each other and the world’s temperature will stay about the same as it is now.
选项 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
答案D
解析 本题为客观细节题。文章开头第一句指出人们过去一度曾认为污染只影响大城市的工业区及相邻地区和汽车多的地方。因此，这只是人们曾有的观点。
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