单项选择题

To save old books, Richardson first ______.

A．places the wet pages on a sheet of glass
B．washes the pages
C．mends the cover
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单项选择题
People knew the nature of wolf very well.
A．Right.
B．Wrong.
C．Doesn't say.
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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