A good title for this passage is . The average number of hours of sleep that an adult needs is .

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问题 A good title for this passage is ______.
The average number of hours of sleep that an adult needs is ______.

选项 A、approximately six hours
B、around ten hours
C、about eight hours
D、not stated here

答案D

解析从全篇看，作者没有谈到这个问题。

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大学英语三级B级

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