0g11-96

Commentator: The theory of trade retailation states that countries closed out of any of another country's markets should close some of their own markets to the other country in order to pressure the other country to reopen its markets.If every country acted according to this theory, no country would trade with any other.

The commentator's argument relies on which of the following assumptions?

A. No country actually acts according to the theory of trade retailation.

B. No country should block any of its markets to foreign trade

D. For any two countries, at least one has some market closed to the other.

选D。这题是说如果两国互相关闭市场，就没有国际贸易存在了。A和B我觉也都说的有道理，错在哪了？？

对AB取非，不能削弱结论

A：所有得国家都这么干，得出结论（support）

B：所有得国家都关掉自己得市场，support结论

D：没有国家先关闭市场，得不出结论，weaken结论。因此D是答案

－－－

其实AB都没有触及结论得实质，只是在重复结论得条件。

取非的办法是ETS提供给全世界考生用以检验assumption答案的正确性的推荐方法。其利用了assumption作为必要条件的基本性质，即如果assumption不成立，则原文亦不成立。

如果答案是一个assumption则必须满足上述条件。

取非通俗的讲，即对选项进行否定，然后带入原文，使得原文不成立得即为答案。

取非虽然办法使好，但是很非时间，对于阅读能力有一定要求，对于一些特殊词得取非可以参考laywer得帖子。

assumption的方法基本的两种：1.填gap 2.not+weaken。即取非削弱。所有的这两个方法都可以用取非削弱进行检验，LZ可以多做题目以寻找感觉。

多谢，gonghao 版主分析很清楚！