单项选择题

Before going to bed, you'd better ______.

A．breathe deeply
B．have a biological clock
C．invite problems
D．relax
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单项选择题
It is better to have ______ alcohol for a complete night sleep.
A．no
B．a lot of
C．some
D．much
单项选择题
Caffeine ______ if you want to have a good sleep.
A．should be taken seven hours earlier
B．should not be taken
C．should be taken two or three hours earlier
D．should be taken little
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