在
阅读了不少牛人关于GMAT逻辑题的心经，有的看不懂，不会运用;有的看懂了，但毕竟不是自己的，看过就忘了。今天试着开始用尽量简单的语言总结一下OGCR的做法及我的感受，希望自己有所收获，同时也希望大家看到的不吝赐教，挑出毛病来，共同进步。
确定为assumption题，读题干，看选项。先找有not的选项，如果有，看看是不是not+weaken，是的话基本上就是答案;不是的话，看剩下的选项有没有补充文章gap的，看这些选项的时候要思考是不是结论成立的必要条件，即问自己一定要这样结论才成立吗。
需要注意的细节(有待大家商讨以决定适用性)：
1) 如果5个选项都没有not，那么，有必要进一步认定这是个填补gap的题;排除选项的时候心里要默默的想文章中是不是缺少了这样的gap。如OG-21/63/76
例子：OG-21
When limitations were in effect on nuclear-arms testing, people tended to save more of their money, but when nuclear-arms testing increased, people tended to spend more of their money. The perceived threat of nuclear catastrophe, therefore, decreases the willingness of people to postpone consumption for the sake of saving money.
The argument above assumes that
A. the perceived threat of nuclear catastrophe has increased over the years.
B. most people supported the development of nuclear arms
C. people’s perception of the threat of nuclear catastrophe depends on the amount of nuclear-arms testing being done
D. the people who saved the most money when nuclear-arms testing was limited were the ones who supported such limitations(C)
E. there are more consumer goods available when nuclear-arms testing increases
OG解释：
On the basis of an observed correlation between arms testing and people’s tendency to save money, the argument concludes that there is a causal connection between a perception of threat and the tendency not to save. That connection cannot be made unless C, linking the perception of threat to the amount of testing being done, is assumed to be true. Therefore, C is the best answer.
2) 错误的选项包括无关选项、与原文不兼容选项等。无关选项的内容可能包罗万象，其种类作者没有详加分析，但有一种需要引起注意，即与原文兼容的(compatible)的选项，这类选项比较具有迷惑性，因为看不出明显的纰漏，这也是为什么要检验自己所选的答案是否必要的原因之一。