2. 专升本
  3. When a spacecraft travels, one of the major problems is reentry into the Earth’s______.

When a spacecraft travels, one of the major problems is reentry into the Earth’s______.

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问题 When a spacecraft travels, one of the major problems is reentry into the Earth’s______.
选项 A、surface
B、atmosphere
C、attitude
D、bent
答案B
解析
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