单项选择题

China started its space industry only in recent years, and should _______ no lime in catching up.

A．delay
B．lag
C．lessen
D．lose
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单项选择题
Then the _______ streamed into tire great hall.
A．group
B．crowd
C．gang
D．masses
单项选择题
Once a _______ is formed it is very difficult to shake it off.
A．habit
B．custom
C．practice
D．usage
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