问答题

Investigators have tried to find out how long a person can go without sleep. (Passage 1)

【参考答案】

研究者们试图去发现一个人不睡觉能坚持多久。

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Tusks in good condition are in great demand, and may sell for as high as two thousand dollars or more. (Passage 2)

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An elephant uses its long, pointed tusks as tools for digging in the ground for food. He also uses them as weapons in combat. (Passage 2)