单项选择题

The old cover of the book ______.

A． must be used
B． is sometimes used
C． should never be used
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单项选择题
The Restaurant is welcomed ______.
A． only by children
B． only by old people
C． almost by everyone
单项选择题
The cost of a meal is ______.
A． the same for everybody
B． higher for adults than for children
C． lower for adults than for children
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