单项选择题

It is desirable that students should acquire some knowledge of the writers whose _______ are placed before them for study.

A．materials
B．manufactures
C．products
D．productions
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单项选择题
In recent years the ________ of living has almost double and I can hardly make both ends meet.
A．price
B．charge
C．expense
D．cost
单项选择题
I found the little boy sitting on the steps, crying _______.
A．heavily
B．strongly
C．bitterly
D．deeply
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