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相信大家都有同样的感受：逻辑排除3个选项很容易，难的是在剩下的选项中选择正确的那个。但我这段时间复习OG解释，觉得其实对ETS来说，4个选项都和正确选项差的很远，只要我们多总结ETS经常出的混淆选项，就能很快掌握规律。所以发起此贴，希望大家都把自己复习过程中，对如何排除混淆选项，以及GMAT逻辑常见混淆选项贴出来，讨论完善，共同打造beat GMAT逻辑的一把利剑。
我先来：
GMAT逻辑混淆选项一：因果关系的削弱题，貌似排除它因的选项。
排除办法：此所谓“它因”的存在是合理的，且与文章的因果关系无关。
OG131. weaken
Bank depositors in the United States are all financially protected against bank failure because the government insures all individuals' bank deposits. An economist argues that this insurance is partly responsible for the high rate of bank failures, since it removes from depositors any financial incentive to find out whether the bank that holds their money is secure against failure. If depositors were more selective, then banks would need to be secure in order to compete for depositors' money.
Which of the following, if true, most seriously weakens the economist's argument?
(A) Before the government started to insure depositors against bank failure, there was a lower rate of bank failure than there is now.
(B) When the government did not insure deposits, frequent bank failures occurred as a result of depositors' fears of losing money in bank failures.
(C) Surveys show that a significant proportion of depositors are aware that their deposits are insured by the government.
(D) There is an upper limit on the amount of an individual's deposit that the government will insure, but very few individuals' deposits exceed this limit.
(E) The security of a bank against failure depends on the percentage of its assets that are loaned out and also on how much risk its loans involve. 混淆选项，貌似给出一个银行failure的它因，以削弱结论
排除办法：
1. 文章说的是partly responsible for，不是only because，所以存在其他导致银行failure的原因与原文并不矛盾
2.这个所谓“它因”与原文提供的因果无关。见OG解释。所以对原文产生不了任何作用。
131.
The argument that deposit insurance, because of its impact on depositors’ choices of banks, is partially responsible for the high rate of bank failures would be weakened if deposit insurance also prevented certain bank failures. Choice B suggests that deposit insurance does prevent certain bank failures, and is thus the best answer.
Choice A weakly supports the view that insuring deposits contributes to bank failures. Choice C supports the economist’s position that depositors take the safety of deposits into account. Choice D supports the argument’s relevance by indicating that virtually all depositors can afford to be nonselective. It follows that none of these three choices is correct. Choice E is incorrect because it fails to establish any connection between deposit insurance and the factors controlling bank failures. | 
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发表于 2005-6-10 00:53:00
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