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
First published in 1927, the charts remain an ______ source for researchers.
A．identical
B．indispensable
C．intelligent
D．inevitable
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