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
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.
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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