GMAT逻辑题目:

　　A survey was recentlyconducted among ferry passengers on the North Sea. Among the results was this:more of those who had taken anti-seasickness medication before their tripreported symptoms of seasickness than those who had not taken such medication.It is clear, then, that despite claims by drug companies that clinical testsshow the contrary, people would be better off not taking anti-seasicknessmedications.

　　Which one of the following, if true, wouldmost weaken the conclusion above?

　　A. Givenrough enough weather, most ferry passengers will have some symptoms ofseasickness.

　　B. Theclinical tests reported by the drug companies were conducted by the drugcompanies’ staffs.

　　C. Peoplewho do not take anti-seasickness medication are just as likely to respond to asurvey on seasickness as people who do.

　　D. Theseasickness symptoms of the people who took anti-seasickness medication wouldhave been more severe had they not taken the medication.

　　E. Peoplewho have spent money on anti-seasickness medication are less likely to admitsymptoms of seasickness than those who have not.

　　参考答案：D

　　The passage concludes that the medicine isnot useful at all because the  people taking the drug appear to be sicker thanthose people not taking the drug. However, it does not consider the peopletaking the drug could appear to be even sicker if they do not take the drug. Itdoes not make the wise comparison between two originally the same survey group.So D most accurately point out the lope hole in the reasoning of the passage,thus the best answer.

　　A. Byeliminating the difference of the two survey groups, actually support theconclusion.

　　B. Withoutfurther information, the conclusion will not be changed a little whoeverconducted the test.

　　C. Byeliminating the difference of the two survey groups, weakly support theconclusion.

　　D. Asdiscussed.

　　E. Byeven further decrease the sampling difference, E actually support theconclusion.

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