______ can send a spaceship into space. The booster falls off as soon as ______ .

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问题 ______ can send a spaceship into space.
The booster falls off as soon as ______ .

选项 A、it uses up its fuel
B、it flies into the sky
C、it flies into the space
D、it lifts from the ground

答案A

解析 本题题干问“第一级火箭何时脱落”。原文第2段第4句话指出当第一级火箭所携带燃料用完后与二级火箭脱落。因此选项A. it uses up its fuel是正确答案。
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