PASSAGE THREE What did Rechtschaffen want to find out in his research in the 1980s?

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问题 PASSAGE THREE
What did Rechtschaffen want to find out in his research in the 1980s?

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答案Why people sleep.

解析 根据题目中的Rechtschaffen,the 1980s可定位到最后一段第1句,该句句首指明了Rechtschaffen实验的目的:为了找出我们为何睡觉(In the most famous attempt to figure out why we sleep),故答案可写Why people sleep。
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