单选题
Caffeine ______ if you want to have a good sleep.
A、
should be taken seven hours earlier
B、
should not be taken
C、
should be taken two or three hours earlier
D、
should be taken little
【正确答案】
D
【答案解析】
解析：由文章第九段第一行Avoid caffeine. Caffeine is a common disrupter of sleep可知，如果你想睡个好觉，不要摄人太多咖啡因。
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