再次重申，CR题的重点并不在於故事是否百分百了解， 而是是否了解背後的套路。 124. It is widely assumed that people need to engage in intellectual activities such as solving crossword puzzles or mathematics problems in order to maintain mental sharpness as they age. In fact, however, simply talking to other people—that is, participating in social interaction, which engages many mental and perceptual skills— suffices. Evidence to this effect comes from a study showing that the more social contact people report, the better their mental skills. Which of the following, if true, most seriously weakens the force of the evidence cited? 读完题目，发现GMAT惯用的两个CR构题特色： 因果结论题：A会导致B（与人对话就可以提昇mental） 实验报告题：有A特色的那组人，也有B的特色（越多人际交流的人，mental越好） 因果结论题可以判断出最有可能的正确答案削弱方向： - 倒果为因 - 另有他因 实验报告题可以判断出最有可能的正确答案削弱方向： - 倒果为因（其实是mental skills先好，才会去做人际交流） - 另有他因（人际交流较多的这一组人刚好有另个共通点， 是那个共通点才导致mental skills 上升） 题目结论：人际互动会不会提昇mental sharpness/skill。 换句话说，是要找原因。 (A) As people grow older, they are often advised to keep exercising their physical and mental capacities in order to maintain or improve them. 没有去找「原因」 (B) Many medical conditions and treatments that adversely affect a person’s mental sharpness also tend to increase that person’s social isolation. 点出了他因"medical conditions and treatments" （不过注意此选项是倒过来讲的叙述： 损害mental的疗法同时也会降低人际交流 但已经很明确地指出，人际交流不一定会直接影响mental 而有可能两个都巧合地是一个他因的结果） (C) Many people are proficient both in social interactions and in solving mathematical problems. 没有去找「原因」 (D) The study did not itself collect data but analyzed data bearing on the issue from prior studies. 看似是在质疑资料可信度，但没有说prior studies不可信。 所以不构成有效质疑。 (E) The tasks evaluating mental sharpness for which data were compiled by the study were more akin to mathematics problems than to conversation. 无关比较。说实验的设计较偏向数学问题 而非交谈问题。 但没有质疑到该实验的准确性。 就算实验较偏向数学问题，也不代表实验中人际交谈部分的资料不可信。 -- Dustin Deng (一战自修760，AWA 5.5) Dustin/A2GMAT 全科机经班： http://goo.gl/forms/nYr9M7nhwy GMAT自修资源部落格： http://dustingmat.blogspot.tw A2GMAT线上解题、讨论Group： https://www.facebook.com/groups/A2GMAT/ --

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