单项选择题

A child's actions should be modified by imposing a system of rewards.

A．enforcing
B．opposing
C．incorporating
D．implementing
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单项选择题
The constant friction of the wire on the metal pulley eventually caused it to break.
A．declining
B．ageing
C．pulling
D．rubbing
单项选择题
The voluntary decision to label seems to have been rewarded.
A．paid out
B．paid back
C．paid up
D．paid off
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