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题目材料：
The more the residents of a city exercise, the lower the average number of heart attacks in that city. Likewise, the less the residents of a city exercise, the greater the average number of heart attacks in that city. Therefore, people who wish to reduce the chance of suffering a heart attack should exercise more.
Which of the following, if true, most seriously undermines the argument?
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A.Heart attacks are a common cause of death in cities with high exercise rates.
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B.The cities with low exercise rates are often those with the highest standards of living.
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C.A particular resident of a city whose population has a high exercise rate may not exercise at all.
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D.The cities with high exercise rates are also the cities with the lowest number of cigarette smokers.
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E.The differences in exercise rates among cities often result from the availability of conveniently located gyms.
D显示答案
