After some time the second stage of the space shuttle, having used up its fuel,

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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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