GMAT考试对同学们的逻辑分析能力提出了较高的要求，而这一点正是很多中国考生的弱势所在。新东方网GMAT频道在此和大家分享GMAT逻辑题目之GWD逻辑24套的题目，希望对各位了解GMAT考试，锻炼自己的逻辑分析能力有所帮助。

　　GWD5-Q20:

　　Scientists typically do their most creative work before the age of forty. It is commonly thought that this happens because aging by itself brings about a loss of creative capacity. However, studies show that a disproportionately large number of the scientists who produce highly creative work beyond the age of forty entered their field at an older age than is usual. Since by the age of forty the large majority of scientists have been working in their field for at least fifteen years, the studies’ finding strongly suggests that the real reason why scientists over forty rarely produce highly creative work is not that they have simply aged but rather that they generally have spent too long in a given field.

　　In the argument given, the two portions in boldface play which of the following roles?

　　A. The first is the position that the argument as a whole opposes; the second is an objection that has been raised against a position defended in the argument.

　　B. The first is a claim that has been advanced in support of a position that the argument opposes; the second is a finding that has been used in support of that position.

　　C. The first is an explanation that the argument challenges; the second is a finding that has been used in support of that explanation.

　　D. The first is an explanation that the argument challenges; the second is a finding on which that challenge is based.

　　E. The first is an explanation that the argument defends; the second is a finding that has been used to challenge that explanation.

　　答案：D

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