单项选择题

It is a common belief among parents that too many hours for sports may hamper academic pursuits of the students.

A．promote
B．destroy
C．hinder
D．arouse
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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
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
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