单项选择题

There's no right amount of sleep for everyone，and generally sleep requirements decrease with age．

A．每个人都没有恰当的睡眠量，一般来说，睡眠需求会随着年龄增长而减少。
B．每个人所需的睡眠时间不尽相同，一般是随着年龄的增长而减少。
C．睡眠不足者需求的睡眠量一般都随着年龄而减少。
D．一个人没有固定的睡眠时间，一般会缩短寿命。
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One of the reasons for the change in American marriages is ________.
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B．difference in making friends
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The percentage of remarriage among divorced Americans is ________.
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