单项选择题

The average number of hours of sleep that an adult needs is ______.

A．approximately six hours
B．around ten hours
C．about eight hours
D．not stated here
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单项选择题
During REM, ______.
A．your eyes move quickly
B．you dream
C．you are restless
D．both A and B
单项选择题
If you had told me about your difficulty, I ______ able to help you.
A．will have been
B．would have been
C．will be
D．would be
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