单项选择题

Richardson mends old books ______.

A．in a hospital
B．in a library
C．at home
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单项选择题
The old cover of the book ______.
A．must be used
B．is sometimes used
C．should never be used
单项选择题
There are fewer grey wolves in Europe than in the USA.
A．Right.
B．Wrong.
C．Doesn't say.
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