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单项选择题

A．only sleepB．watch TVC．write lettersD．readIt is better……

It is better for you to ______ in bed.


A．only sleep
B．watch TV
C．write letters
D．read
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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Before going to bed, you'd better ______.

A．breathe deeply
B．have a biological clock
C．invite problems
D．relax

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.

单项选择题How did Braille make use of raised dots in his code

A．He used them for the 26 letters of the alphabet.
B．He used them for pictures.
C．He used them for punctuation marks and short words.
D．Both A and C.