单项选择题

After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.

A. runs away
B. charges for
C. falls off
D. merges into
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单项选择题
He couldn’t ______ his curiosity to see what was in the box.
A. retain
B. restrain
C. restrict
D. represent
单项选择题
What is it that the author wants to ______ to his readers through the story
A. convey
B. convince
C. convert
D. conform
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