单项选择题

We must ______ our forests and woodlands for future generations.

A．reverse
B．reserve
C．conserve
D．convert
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单项选择题
Social evils were fundamentally caused by ______ inequality.
A．economy
B．grave
C．intellectual
D．appearance
单项选择题
One of the ______ of this method is that it saves a lot of fuel and doesn't pollute air.
A．interests
B．benefits
C．profits
D．advantages
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