单项选择题

The children ______ before they work in the Restaurant.

A． must be trained
B． must be over seven years old
C． should know how to read and write
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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
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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