12. Leachate is a solutions, frequently highly contaminated, that develops when water permeates a landfill site, If and only if the landfill's capacity to hold liquids is exceeded does the leachates escape into the environment, generally in unpredictable quantities, A method must be found for disposing of leachate. Most landfill leachate is send directly to sewage treatment plants, but not all sewage plants are capable of handling the highly contaminated water.
Which one of the following can be inferred from the passage?
(A) The ability to predict the volume of escaping landfill leachate would help solve the disposal problem.
(B) (B)If any water permeates a landfill, leachate will escape into the environment.
(C) No sewage treatment plants are capable of handling leachate.
(D) Some landfill leachate is send to sewage treatment plants that are incapable of
handling it.
(E) If leachate does not escape from a landfill into the environment, then the landfill's capacity to hold liquids has not been exceeded.
我选的是 D。 我认为原题的推导关系是：the leachates escape into the environment=》landfill's capacity to hold liquids is exceeded 。因为” If and only if “.....，应为必要条件。如果这样就与答案 E 不符，不知错在哪里。而且，我觉得D 正确，从原文最后一句“Most landfill leachate is send directly to sewage treatment plants, but not all sewage plants are capable of handling the highly contaminated water.”可知。
谢谢解答。作者: StephanieYun 时间: 2003-5-14 11:33
注意capable of
生活是一杯清茶作者: cindyschu 时间: 2003-5-14 17:11
谢谢，但是能再详细一点吗？作者: StephanieYun 时间: 2003-5-14 20:39
题目只是说capable of , 并没有说所有escaped liquid leachate(逃逸液性沥青)都是那种“ 并不是所有处理厂都能处理的高浓度沥青 “， 所以， 你能就此推出“ Some landfill leachate is send to sewage treatment plants that are incapable of
handling it.“吗？作者: cindyschu 时间: 2003-5-14 23:37
非常感谢，想再请教答案 E 中的推导，为什么不是the leachates escape into the environment=》landfill's capacity to hold liquids is exceeded ，我还是觉得” If and only if “.....，应为必要条件啊！
能稍加指点吗？
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