题目信息
The number of United States citizens suffering from the flu increased significantly this year over last year. Since this increase did not occur among citizens of other countries, it is likely the result of a particular flu virus confined to the United States.
Which of the following, if true, would cast the most serious doubt on the explanation for the increase given above?
A:Many non-US citizens took flu vaccines this year.
B:This year, the flu suffered by citizens of other countries was generally more severe than that suffered by US citizens.
C:A large percentage of US citizens who suffered from the flu this year were living abroad.
D:Many US citizens who suffered from the flu this year also suffered from the flu last year.
E:The number of US citizens did not change significantly between last year and this year.
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正确答案：
C:A large percentage of US citizens who suffered from the flu this year were living abroad.
Premise: 美国今年患流感人数上升，而别的国家的人患流感人数却没有上升 Conclusion: 这是由一种美国地区才有的病毒造成的Weaken: 不是这个美国特有的病毒的原因。 C大部分感染流感的美国人都住在国外。既然都住在国外，说明感染并不是这个美国地区才有的病毒造成的。
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