单项选择题

We must abide by the rules.

A．stick to
B．persist in
C．safeguard
D．apply
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单项选择题
The once barren hillsides are now good farmland.
A．hairless
B．bare
C．empty
D．bald
单项选择题
She exhibited great powers of endurance during the climb.
A．play
B．send
C．show
D．tell
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