2. 外语
  3. Pollution is a "dirty" word. To pollute means to contaminate-topsoil or something by introducing impurities which make【C1】______

Pollution is a "dirty" word. To pollute means to contaminate-topsoil or something by introducing impurities which make【C1】______

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问题    Pollution is a "dirty" word. To pollute means to contaminate-topsoil or something by introducing impurities which make【C1】______unfit or unclean to use. Pollution comes in many forms. We see it, smell it,【C2】______it, drink it, and stumble through it. We literally live in and breathe pollution, and【C3】______surprise, it is beginning to【C4】______our health, our happiness, and our civilization.
   Once we thought of pollution【C5】______meaning simply the smog—the choking, stinging, dirty【C6】______that hovers over cities. But air pollution, while it is【C7】______the most dangerous, is only one type of contamination among several【C8】______attack the most basic life functions.
   Through the uncontrolled use of insecticides, man has polluted the land,【C9】______the wildlife. By【C10】______sewage and chemicals into rivers and lakes, we have contaminated our【C11】______water. We are polluting the oceans, too, killing the fish and【C12】______robbing ourselves【C13】______an invaluable food supply.
   Part of the problem is our exploding【C14】______. More and more people are producing more wastes. But this problem is intensified by our "throw-away" technology. Each year Americans【C15】______of 7 million autos, 20 million tons of waste paper, 25 million pounds of toothpaste tubes and 48 million cans. We throw away gum wrappers, newspapers, and paper plates. It is no longer wise to【C16】______anything. Today almost everything is disposable.【C17】______of repairing a toaster or a radio, it is easier and cheaper to buy another one and discard the old, even【C18】______95 percent of its parts may still be functioning. Baby diapers, which used to be made of reusable cloth, are now paper throw-aways. Soon we will wear clothing made of【C19】______: "Wear it once and throw it away" will be the slogan of the fashionable consciousness.
   Where is this all to end? Are we turning the world into a gigantic dump, or is there hope that we can solve the pollution problem?【C20】______, solutions are in sight. A few of them are positively ingenious.
【C8】
选项 A、who
B、which
C、when
D、whom
答案B
解析 分析句子结构可知，空格处引导定语从句，且在句中做主语，修饰“several(types of contamination)”，只有which符合题意。故选B。
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