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
There are fewer grey wolves in Europe than in the USA.
A．Right.
B．Wrong.
C．Doesn't say.
单项选择题
Why should old books be saved
A．Because they give us a lot of information.
B．Because they are very interesting.
C．Because they may be the only copy.
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