单项选择题


A．lowering
B．bringing down
C．keeping up
D．pushing up
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单项选择题
A．restrictsB．distressesC．encouragesD．dissuades
A．restricts
B．distresses
C．encourages
D．dissuades
单项选择题
A．varyB．variesC．differentD．' differs
A．vary
B．varies
C．different
D．' differs
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