When a spacecraft travels, one of the major problems is reentry into the Earth’s _______. ( 章节：4 难度：2)
- A、surface
- B、atmosphere
- C、attitude
- D、bent
正确答案:B
答案解析:有
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When a spacecraft travels, one of the major problems is reentry into the Earth’s _______. ( 章节：4 难度：2)
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