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        Leachate is a solution, 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 leachate 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) 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.

答案是e~~不懂。。。

If and only if  A, then B. 说明A是B的充分必要条件。其逆否命题也一定成立。这里A是the landfill’s capacity to hold liquids is exceeded ，B是the leachate escape into the environment。因此非B能够推出非A。所以E成立。

A predict, 无关

B any water permeates a landfill形成leachate，而不能说明leachate就能渗透到环境中去。

C题目没有这样说

D题目没有说leachate被送到不能处理的工厂

 Most landfill leachate is sent directly to sewage treatment plants, but not all sewage plants are capable of handling the highly contaminated water---->

这句话难道不能说明这个嘛,Some landfill leachate is sent to sewage treatment plants that are incapable of handling it.

大多数的leachate被送到了处理工厂.不是所有的工厂都能处理leathate.

这里的所有工厂是指前边提到的,leachate被送去的所有工厂呢.  还是所有的处理工厂呢?

如果是指所有的处理工厂的话,那么可以理解为,leachate被直接送到了可以处理leachate的工厂里,这样D就可以排除了.