The author mentions "pick-me-up" to indicate that______. Which of the following tells us how caffeine affects sleep?

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问题 The author mentions "pick-me-up" to indicate that______.
Which of the following tells us how caffeine affects sleep?

选项 A、Caffeine blocks production of the enzyme that stops melatonin production.
B、Caffeine interrupts the flow of sleep hormone.
C、Caffeine halves the body’s levels of sleep hormone.
D、Caffeine stays in the body for many hours.

答案C

解析 利用题干中的核心词“caffeine”,作为答案线索,发现答案相关句:But researchers in Israel have found that caffeinated(caffeine的同根词)coffee halves the body’s levels of this sleep hormone.根据halves这个词的使用判断C是答案。
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