can send a spaceship into space. After falls, the spaceship travels in space itself.

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问题 ______ can send a spaceship into space.
After ______ falls, the spaceship travels in space itself.

选项 A、the booster
B、the first rocket
C、the second rocket
D、the third rocket

答案D

解析本题题干问“在第几级火箭脱落后，太空船进入太空飞行”。原文第2段第7和第8句话指出当第三级火箭脱落后，太空船靠自身动力飞往目的地。因此选项D. the third rocket是正确答案。

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大学英语三级B级

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