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  3. Air Pollution There was one thought that air pollution affected only the areas immediately around large cities with factories

Air Pollution There was one thought that air pollution affected only the areas immediately around large cities with factories

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问题                               Air Pollution
   There was one thought that air pollution affected only the areas immediately around large cities with factories and heavy automobile traffic. 【B1】______
   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(二氧化碳) in the air resulting from the burning of coal and oil is creating a "greenhouse effect". It conserves heat reflected from the earth and raised the world’ s average temperature.【B2】______Thus much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be in water.
  【B3】______This is 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.【B4】______Driven by economic profit, people neglect the damage on our environment caused by the "advanced civilization".【B5】______But is it really worthwhile?
   A. Perhaps, if we are lucky enough, the two tendencies will offset(抵消)each other and the world’ s temperature will stay about the same as it is now.
   B. If this view is correct, the world’ s temperature is raised only a few degrees.
   C. Maybe the air pollution is the price the human beings have to pay for their development.
   D. At present, we realize that although these are the areas with the worst air pollution, the problem is literally worldwide.
   E. Lately, global warming is becoming a serious problem.
   F. Another view, less widely held, is that increasing particular matter in the atmosphere (大气)is blocking sunlight and lowering the earth’ s temperature.
【B1】
选项
答案D
解析 文章开篇讲述了人们对空气污染这一问题的认识。第一句话讲述过去人们的想法是“空气污染曾一度被认为只影响拥有工厂和交通拥堵的大城市的周边地区。”浏览备选答案，不难发现选项D中的At present作为时间状语，在结构上有着承上启下的作用，讲述现在人们对于污染的认识。因此，D选项为空格处应填句子。
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