单项选择题

Running is often （） your health.

A．good for
B．good at
C．good of
D．good in

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单项选择题

China is one of the （） countries in the world.

A．developed
B．developing
C．rich
D．poor

单项选择题

Tom should make every （） to study well.

A．affect
B．effect
C．afford
D．effort

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