2. 专升本
  3. ______man must fear when traveling in space is radiation from the sun and Van Allen Belts.

______man must fear when traveling in space is radiation from the sun and Van Allen Belts.

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问题 ______man must fear when traveling in space is radiation from the sun and Van Allen Belts.
选项 A、What
B、Which
C、How
D、That
答案A
解析
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