单项选择题

We began to ______ the bricks from the truck and carry them to the construction site.

A．uncover
B．unload
C．unlock
D．undo
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单项选择题
Many people protested before the Embassy and ______ for immediate stop to the war.
A．requested
B．appealed
C．called
D．begged
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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