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
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
单项选择题
Why did the captain's night writing excite Braille
A．It used dots and dashes instead of letters.
B．It used sounds instead of letters.
C．It could be read by touch instead of sight.
D．It could he read at night.
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