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  3. Where do pesticides (杀虫剂) fit into the picture of environmental disease? We have seen that they now pollute soil, water, and foo

Where do pesticides (杀虫剂) fit into the picture of environmental disease? We have seen that they now pollute soil, water, and foo

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问题     Where do pesticides (杀虫剂) 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 fish-less and our gardens and woodlands silent and birdless. Man, however much he may like to pretend the 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 (积累的) 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 本题是一道具体细节题。问人们为什么忽视杀虫剂进人人体后的潜在作用。利用查阅式阅读法，我们可以在第三段里找到与正确答案相关的内容。这段指出，富有责任心的公众健康机构的官员已经指出了化学制品对身体的影响是长期积累的结果，而化学制品对人的危害大小取决于人一生中接触和吸收的剂量的多少。因此，本题的正确答案应是C“人们往往忽略接触化学制品后的潜在后果，正是因为化学制品的危害没有立即显现出来”。
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