再次重申，CR題的重點並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? 讀完題目，發現GMAT慣用的兩個CR構題特色： 因果結論題：A會導致B（與人對話就可以提昇mental） 實驗報告題：有A特色的那組人，也有B的特色（越多人際交流的人，mental越好） 因果結論題可以判斷出最有可能的正確答案削弱方向： - 倒果為因 - 另有他因 實驗報告題可以判斷出最有可能的正確答案削弱方向： - 倒果為因（其實是mental skills先好，才會去做人際交流） - 另有他因（人際交流較多的這一組人剛好有另個共通點， 是那個共通點才導致mental skills 上升） 題目結論：人際互動會不會提昇mental sharpness/skill。 換句話說，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. 沒有去找「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. 點出了他因"medical conditions and treatments" （不過注意此選項是倒過來講的敘述： 損害mental的療法同時也會降低人際交流 但已經很明確地指出，人際交流不一定會直接影響mental 而有可能兩個都巧合地是一個他因的結果） (C) Many people are proficient both in social interactions and in solving mathematical problems. 沒有去找「原因」 (D) The study did not itself collect data but analyzed data bearing on the issue from prior studies. 看似是在質疑資料可信度，但沒有說prior studies不可信。 所以不構成有效質疑。 (E) The tasks evaluating mental sharpness for which data were compiled by the study were more akin to mathematics problems than to conversation. 無關比較。說實驗的設計較偏向數學問題 而非交談問題。 但沒有質疑到該實驗的準確性。 就算實驗較偏向數學問題，也不代表實驗中人際交談部分的資料不可信。 -- Dustin Deng (一戰自修760，AWA 5.5) Dustin/A2GMAT 全科機經班： http://goo.gl/forms/nYr9M7nhwy GMAT自修資源部落格： http://dustingmat.blogspot.tw A2GMAT線上解題、討論Group： https://www.facebook.com/groups/A2GMAT/ --

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