单项选择题

China started its nuclear power industry only in recent years, and should ______ no time in catching up.

A．delay
B．lose
C．lag
D．lessen
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单项选择题
Mr. Morton gradually ______ a knowledge of the subject.
A．attained
B．required
C．acquired
D．enquired
单项选择题
Advertising costs are no longer in reasonable ______ to total cost of the product.
A．relationship
B．match
C．measure
D．proportion
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