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
When you get excited, try to hold yourself ______.
A．up
B．down
C．off
D．in
单项选择题
Many of the students have a grasp of the main structures, a reasonable vocabulary and a (n) ______ idea of how to pronounce most words they come across.
A．faint
B．vague
C．obscure
D．rough
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