2. 外语
  3. The author thinks sleep is a funny thing as it is necessary for human life. If the eyes of a sleeping person flicker back and f

The author thinks sleep is a funny thing as it is necessary for human life. If the eyes of a sleeping person flicker back and f

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问题 The author thinks sleep is a funny thing as it is necessary for human life.
If the eyes of a sleeping person flicker back and forth rapidly, that means he or she is in ______.
选项
答案REM sleep
解析 第4个小标题REM Sleep部分的第1段第3句：If you ever watch a person or a dog experiencing REM sleep，you will see their eyes flickering back and forth rapidly．空白处需要名词性成分。题目先说明某种动作，然后考查睡着的人如果出现这种情况的话是处于哪个睡眠阶段，这样的表述与原文次序正好颠倒。题目中的in与原文中的experiencing表意相同，故答案为其后的REM sleep。
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