The author mentions "pick-me-up" to indicate that______. What does the experiment mentioned in paragraph 4 prove?

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问题 The author mentions "pick-me-up" to indicate that______.
What does the experiment mentioned in paragraph 4 prove?

选项 A、There are more enzymes in decaf drinkers’ urine sample.
B、There are more melatonin concentrations in caffeine drinkers’ urine sample.
C、Decaf drinkers produce less melatonin.
D、Caffeine drinkers produce less sleep hormone.

答案D

解析 注意到备选项都是涉及到细节内容,因此在指定段落中一一进行查找和确认。同时注意每个备选项中的核心词/短语。The results suggest that melatonin concentrations in caffeine drinkers were half those in decaf drinkers.(该句句意表明B的说法错误)In a paper accepted for publication in Sleep Medicine,the researchers suggest that caffeine blocks production of the enzyme that drives melatonin production. (该句句意表明A和C的说法错误)
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