GMAT逻辑题目:

　　【逻辑】

　　A physically activelifestyle has been shown to help increase longevity. In the Wistar region ofBellaria, the average age at death is considerably higher than in any other partof the country. Wistar is the only mountainous part of Bellaria. A mountainousterrain makes even such basic activities as walking relatively strenuous; itessentially imposes a physically active lifestyle on people. Clearly, thiscircumstance explains the long lives of people in Wistar.

　　Whichof the following, true, most seriously weakens the argument?

　　A. In Bellaria all medicalexpenses are paid by the government, so that personal income does not affectthe quality of health care a person receives.

　　B. People living in Wistar do nothave a significantly better diet than people living in other parts ofBellaria.

　　C. Many people who live in theWistar region have moved there in middle age or upon retirement.

　　D. The many opportunities forhiking, skiing, and other outdoor activities that Wistar’s mountains offer makeit a favorite destination for vacationing Bellarians.

　　Per capita spending on recreational activities is no higher in Wistarthan it is in other regions of Bellaria.

GMAT逻辑答案:

　　Reasoning

　　What would suggest that the reason people in Wistar live longer is not the extra exercise they get from walking in mountainous terrain? The argument is that exercise increases longevity, and people in Wistar have to exercise just to get around in the mountainous terrain. Consequently, that extra exercise must explain their unusual longevity. The argument would be weakened if some other plausible factor could explain their greater longevity; if people in other parts of Bellaria actually get just as much exercise as people in Wistar; or if many people in Wistar have not [wed there long enough to accrue significant benefits from mountain exercise. Therefore, look for an answer option that undermines the argument in one of these ways.

　　A. Since we do not know whether people have higher or lower personal  incomes in Wistar than elsewhere in Bellaria, the relevance of this information is unclear.

　　B. By out the possibility that diet could explain the greater longevity of people in Wistar, this supports the arguments conclusion that mountain exercise is the explanation.

　　C. Correct. People who moved to Wistar in middle age or upon retirement have not pursued a typically Wistarian lifestyle for a major part of their fives, even if they five to be near 100. This indicates that factors other than the Wisterian lifestyle may well have the greatest impact on longevity among that substantial group. This group may have greater longevity than among the Wistarian population in general, rendering hazardous any generalizations about the causes of longevity in Wistar.

　　D. This indicates that Wistar offers many opportunities for mountain exercise--which other Bellarians seem to get only during vacation. Therefore, this option supports the argument's conclusion that such exercise accounts for the greater longevity of people living in Wistar.

　　E. The argument is that people living in Wistar five longer just because of the exercise they get walking in the mountainous terrain as part of their daily routines; they do not have to spend money on recreational activities to get this exercise.

　　The correct answer is C.

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