今天我们再给同学们介绍GRE阅读逻辑单题常考的另一个“内核”——“寻找他因”（为一个现象、结果寻找另一个原因）。
我们先来看这篇例文：
James: Why is it that fish living in the ocean's dark depths do not swim around very much? It must be that the scarcity of food available there prevents them from having much energy for swimming.
Marie: But fish swim around only to approach or avoid other creatures that they can see, and in such conditions of darkness, almost nothing can be seen.
1. Marie responds to James by
A. offering a reason to think that the question James poses is too vague to be satisfactorily answered
B. pointing out that what James presents as an explanation is the very thing that needs to be explained
C. objecting that James's explanation accounts for only some of the cases that it is claimed to cover
D. presenting a reason to doubt that what James tries to explain really happens
E. providing a reason to doubt that the phenomenon James attempts to explain requires any explanation of the kind he offers
詹姆斯对一个现象给出了一个解释（鱼没有体力游来游去），也就是给一个“果”找了一个“因”（各行业都采取了节能措施），并且认为“果”一定是这个“因”导致的。要削弱文章的结论，就要找到另外一个“因”。玛丽的回应就是找到了另外一个“因”（因为深海的环境一片漆黑导致鱼看不到其他动物，所以鱼根本就没有游动的动机（靠近或躲避其他动物），所以不需要用鱼的体能不够来解释（鱼就算是有体力游来游去它也不会游来游去）。
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