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

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

选项 A、runs away
B、charges for
C、falls off
D、merges into

答案C

解析 A项run away“潜逃,私奔,失去控制”;B项charge for“收费,要价”;C项all off“下降,跌落”;D项merge into“合并成”。句意:过了一些时候,航天飞机的第二级由于用光了燃料,就像助推器,脱开然后落下。
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