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  3. Investigators have tried to find out how long a person can go without sleep. (Passage 2)

Investigators have tried to find out how long a person can go without sleep. (Passage 2)

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问题 Investigators have tried to find out how long a person can go without sleep. (Passage 2)
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答案研究者们试图去发现一个人不睡觉能坚持多久。
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