单项选择题

The law will go into ______ when the senator approves it.

A．existence
B．reality
C．effect
D．being
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单项选择题
I should finish the book tonight, for I've read all but the last ______ 。
A．copy
B．B ) title
C．measure
D．chapter
单项选择题
It's important for us to ______ our forest resources.
A．conserve
B．reserve
C．prevent
D．store
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