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  3. Air Pollution refers to the addition of harmful substances to the atmosphere resulting in damage to the environment, human healt

Air Pollution refers to the addition of harmful substances to the atmosphere resulting in damage to the environment, human healt

admin2010-04-12  87
问题     Air Pollution refers to the addition of harmful substances to the atmosphere resulting in damage to the environment, human health, and【S1】______of life. One of many forms of pollution, air pollution occurs inside homes, schools, and offices; in cities; across continents; and even【S2】______. Air pollution makes people sick—it causes breathing problems and【S3】______cancer—and it harms plants, animals, and the ecosystems (生态系统) in which they live. Some air pollutants return to earth in the form of acid rain and snow, which destroy【S4】______and buildings, damage crops and forests, and make lakes and streams【S5】______for fish and other plant and animal life.
    Pollution is changing Earth’s atmosphere so that it lets in more harmful radiation from the Sun. At the same time, our polluted atmosphere is becoming a better insulator (绝缘体), which can【S6】______heat from escaping back into space and lead to a rise in global average temperatures. Scientists【S7】______that the temperature increase, referred to as global warming, will affect world food supply, alter sea level, make weather more【S8】______, and increase the spread of tropical disease.
    Although the effects of future【S9】______change are unknown, some report that exaggerated weather conditions may【S10】______affect agriculture, for example, it may lead to severe drought and sharply decreasing agricultural yields in parts of Africa.

A) globally           B) promotes            C) predict           D) unsuitable
E) science            F) dramatically        G) protect           H) prevent
I) quality            J) climate             K) statues           L) significant
M) powerful           N) moderately          O) extreme
【S7】
选项
答案C
解析 主语后需要一个谓语动词，在剩下的两个动词predict，protect中只有选择predict才能言辞达意。本句话讲的是科学家预测全球变暖所造成的危害。
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