GMAT逻辑题目:

　　For a television program about astrology, investigators wentinto the street and found twenty volunteers born under the sign of Gemini whowere willing to be interviewed on the program and to take a personality test.The test confirmed the investigators’ personal impressions that each of thevolunteers was more sociable and extroverted than people are on average. Thismodest investigation thus supports the claim that one’s astrological birth signinfluences one’s personality.

　　Which one of the following, if true, indicates the mostserious flaw in the method used by the investigators?

　　A. The personalitytest was not administered or scored personally by the investigators.

　　B. People born underastrological signs other than Gemini have been judged by astrologers to be muchless sociable than those born under Gemini.

　　C. The personalimpressions the investigators first formed of other people have tended to beconfirmed by the investigators’ late experience of those people.

　　D. There is notlikely to be a greater proportion of people born under the sign of Gemini onthe street than in the population as a whole.

　　E. People who arenot sociable and extroverted are not likely to agree to participate in such aninvestigation.

　　參考答案：E

　　思路：因果倒置，削弱结论

　　A：无关选项，即使如此也不一定证明实验的不公性

　　B：属于前提假设，不影响结论

　　C：无关选项

　　D：无关对比

　　E：因为socialble才接受调查，并不是因为星座

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