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  3. It was once thought that air pollution ’affected only the area immediately around large cities with factories or heavy automobi

It was once thought that air pollution ’affected only the area immediately around large cities with factories or heavy automobi

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问题    It was once thought that air pollution ’affected only the area immediately around large cities with factories  or heavy automobile traffic. Today, we know 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 entire eastern halt’ of the United States and led to health warning even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of coal and oil is creating a "greenhouse effect" holding in 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 under water.
   Another view, less widely held, is that increasing particulate 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 new ice age and would make agriculture difficult or impossible in many of our top fanning areas. At present we do not know for sure that either of these conditions will happen ( though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we are very lucky, the two tendencies will offset each other and the world’s temperature will stay about the same as it is now.
It can be inferred from the text that______.
选项 A、raising the temperature several degrees will not do much harm to earth life
B、temperature will change dramatically in the coming years
C、lowering the temperature a few degrees will be very harmful in fanning
D、temperature will remain constant in the future
答案C
解析 第二段第二句话A drop of just a few degrees could create something close to new ice age and would make agriculture difficult of impossible in many of our top farming areas，可知气温下降将会产生新的冰川世纪，给农业带来毁灭性的灾难，因此选[C]。同样气温升高，极地冰冠融化，也会给全球带来巨大的灾难，因此排除[A]；未来全球温度可能升高，可能降低，但不会一下子发生剧烈变化，因此排除[B]；未来的气温不发生变化，保持稳定，只是人们做出的乐观预测，并不肯定，因此排除[D]。
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