单项选择题

China started its space industry only in recent years, and should（）no time in catching up.

A. delay
B. lag
C. lessen
D. lose

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单项选择题
(40) （）

A. unusual
B. particular
C. unique
D. typical
单项选择题
I am not sure whether I want to take this course; I may（）for the first week to see if I like it.

A. sit on
B. sit in
C. sit down
D. sit up
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