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
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.
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