单项选择题

A．from
B．in
C．by
D．on
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单项选择题
A．supportsB．balancesC．comes fromD．acts as
A．supports
B．balances
C．comes from
D．acts as
单项选择题
A．UsuallyB．FrequentlyC．NaturallyD．Similarly
A．Usually
B．Frequently
C．Naturally
D．Similarly
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