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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 Ashless and our gardens and woodlands silent and birdless. Man, however much he may contrary, is part of nature. Can he escape a pollution that is now so thoroughly distributed throughout our world?
    We know that even single exposures to these chemicals, if the amount is large enough, can cause extremely severe poisoning. But this is not the major problem. The sudden illness or death of farmers, farm workers, and others exposed to sufficient quantities of pesticides are very sad and should not occur. For the population as a whole, we must be more concerned with the delayed effects of absorbing small amounts of the pesticides that invisibly pollute our world.
    Responsible public health officials have pointed out that the biological effects of chemicals are cumulative over long periods of time, and that the danger to the individual may depend on the sum of the exposures received throughout his lifetime. For these very reasons the danger is easily ignored. It is human nature 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 physician, Dr. Rene Dubos, "yet some of their worst enemies slowly approach them unnoticed. "
People tend to ignore the delayed effects of exposure to chemicals because______.
选项 A、limited exposure to them does little harm to people’s health
B、the present is more important for them than the future
C、the danger does not become apparent immediately
D、humans are capable of withstanding small amounts of poisoning
答案C
解析 文章第三段倒数第二句提到，“It is human nature to shake off what may seem to us athreat of future disaster．”，人类的本性就是不理会看似在将来会造成灾难的威胁，下句又说“Men are naturally most impressed by diseases which have obvious signs”，人们自然地对那些有明显症状的疾病印象最深，即对未显现的危险，人们不会在意，因此，正确答案为C。
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