单项选择题

A．Fine, thank you.
B．The same to you.
C．How do you do
D．I’m a teacher.
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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。
单项选择题
One of the reasons for the change in American marriages is ________.
A．difference in interests
B．difference in making friends
C．difference in choosing jobs
D．difference in family background
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