单项选择题

You should try to ______ your ambition and be more realistic.

A．reserve
B．restrain
C．retain
D．replace
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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
单项选择题
Doctors warned against chewing tobacco as a ______ for smoking.
A．relief
B．revival
C．substitute
D．succession
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