Which of the following tells us how caffeine affe
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Which of the following tells us how caffeine affects sleep?
A. Caffeine blocks production of the enzyme that stops melatonin production.
B. Caffeine interrupts the flow of the hormone that prevents people from sleeping.
C. Caffeine halves the body’s levels of sleep hormone.
D. Caffeine stays in the body for many hours.
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答案：C
由第二段第三句中“It’s the neurohormone that controls our sleep and tells our body when to sleep and when to wake”可知，控制我们睡眠的是神经激素。这一段的最后一个句子告诉我们“含咖啡因咖啡能使这种睡眠激素减半”。这正是咖啡因影响睡眠的原理。