单项选择题

Nancy is only a sort of ______ of her husband"s opinion and has no ideas of her own.

A．sample
B．reproduction
C．shadow
D．echo
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单项选择题
You should try to ______ your ambition and be more realistic.
A．reserve
B．restrain
C．retain
D．replace
单项选择题
When carbon is added to iron in proper ______, the result is steel.
A．rates
B．thicknesses
C．proportions
D．densities
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