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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  100
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
【S10】
选项
答案F
解析 情态动词和实意动词之间最可能出现的词就是副词，做句子中的状语。dramatically(显著地，激烈地)和moderately(适度地)两个副词都是限定程度的；而由于后文出现了severe和sharply两个表示程度很重的词，所以本题选择dramatically。这句话的意思是“尽管未来气候变化所造成的影响还不得而知，但一些人说反常的天气状况会对农业造成极大的影响，比如，会导致非洲部分地区的极度干旱和农作物产量的骤减”。
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