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 本题意为“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。”fall off的意思是“下降,跌落”;ran away的意思是“潜逃,私奔,失去控制”;charge for的意思是“收费,要价”;merges into的意思是“合并成”。根据题意,只有C项为正确答案。
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