单选题：In the third paragraph the author wants to tell the reader

题目分类：理工类
题目类型：单选题
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题目内容：

In the third paragraph the author wants to tell the reader that __________. A．it is natural for teenagers to stay up late and get up late
B．staying up late has a bad effect on teenagers' ability to think and learn
C．during puberty most teenagers experience a kind of gray cloud
D．it is hard for teenagers to get out of bed in the morning

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答案解析：

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