【GMAT考满分逻辑CR题库】People who consume caffeine within six hours of_真题_答案

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People who consume caffeine within six hours of going to sleep are shown to have less restful sleep than those who abstain from caffeine. Short daytime naps usually improve performance and alertness in adults. However, study subjects who consume caffeine immediately before a short afternoon nap performed better on tests and felt more alert after the nap than others who simply took naps.

Which of the following, if true, best reconciles the apparent discrepancy described above?

AIncreased caffeine intake leads to more feelings of tiredness, even though it also prevents people from actually sleeping. 分析该选项
BIncreased caffeine intake leads to more rapid neural functioning, and more rapid neural functioning prevents restful sleep. 分析该选项
CCaffeine takes about twenty minutes to take effect after consumption, so the pre-nap caffeine intake lessened the groggy effects of napping while retaining the benefits. 分析该选项
DThe naps were not long enough to have beneficial effects for either group. 分析该选项
EPeople who regularly consume caffeine require slightly more sleep to function optimally than those who do not regularly consume caffeine. 分析该选项

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正确答案: C

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