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  3. Where do pesticides fit into the picture of environmental disease? We have seen that they now pollute soil, water, and food, tha

Where do pesticides fit into the picture of environmental disease? We have seen that they now pollute soil, water, and food, tha

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问题    Where do pesticides fit into the picture of environmental disease? We have seen that they now pollute soil, water, and food, that they have the power to make our streams fishless and our gardens and woodlands silent and birdless.
   Man, however much he may like to【C1】______the Contrary, is part of nature. Can he【C2】______a pollution that is now so thoroughly【C3】______throughout our world?
   We know that even single exposures to these【C4】______, if the amount is large enough, can cause extremely severe【C5】______. But this is not the major problem. The sudden illness of death of farmers, farm workers, and others【C6】______to sufficient quantities of pesticides are very sad and should not【C7】______.  For the population as a【C8】______, we must be【C9】______concerned with the【C10】______effects of absorbing small amounts of the pesticides that【C11】______pollute our world.
【C12】______public health officials have pointed out that the biological effects of chemicals are【C13】______over long periods of time, and that the danger to the【C14】______may depend on the sum of the exposures【C15】______throughout his lifetime. For these very reasons the danger is easily【C16】______It is human【C17】______to shake off what may seem to us a threat of future disaster. "Men are naturally most impressed by diseases which have obvious signs," says a wise【C18】______, Dr. Rene Dubos, "yet some of their worst enemies slowly【C19】______them【C20】______."
【C11】
选项 A、invincibly
B、conspicuously
C、invisibly
D、simultaneously
答案C
解析 invisible与前面的delayed effects相呼应。
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