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I read the explanations in OG 17 and beat GMAT, both provided very good methodology to analyse this question.
First, define this as a causal question.
Secondly, seek the premise and the conclusion of the argument, in the specific case:
Premise: The more social contact people report, the better their mental skills are.
Conclusion: social interaction suffices to keep mental sharpness.
Here, the conjunction words however and the sentence Evidence... can help you to get the premises and conclusions.
Thirdly, the question stem is to weaken the evidence, the evidence shows a correlation between mental sharpness and social interaction. (这个证据说明了大脑敏锐度和 社交之间的关系这种现象的存在), but does not indicate why this correlation exists(但是没有说明这种关系为什么存在,或者说这种关系如何存在).Evidence that mental sharpness contributes to social interaction or that some third factor affects both mental sharpness and social interaction( 如果是大脑敏锐度提高了社交呢, 或者说如果是其他原因提高了这两者呢.). 所以这里的B 选项 就是说其他的第三方同时导致了两者, 从而削弱了结论社交活动有助于大脑的敏锐度。
PS.: 我估计是不是很多小伙伴会不会像我一样理解 the more... the better... 的意思是 the more 的部分导致了the better 部分 ,所以导致这个题有点难理解。
从这道题来看, 理解 他们的每个用法的所有含义是很必要的 。
欢迎批评指正。
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