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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单项选择题
It is better for you to ______ in bed.
A．only sleep
B．watch TV
C．write letters
D．read
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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