2. 外语
  3. After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and______.

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 fall off下降，跌落。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。A．run away潜逃，私奔，失去控制；D．charge for收费，要价；D．merge into合并成。
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