2. 外语
  3. When the astronauts are working, sleeping bags are fastened______. How long does it take the spacecraft to go round the Earth?

When the astronauts are working, sleeping bags are fastened______. How long does it take the spacecraft to go round the Earth?

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问题 When the astronauts are working, sleeping bags are fastened______.
How long does it take the spacecraft to go round the Earth?
选项 A、Forty minutes.
B、Fifty minutes.
C、Ninety minutes.
D、Twenty-four hours.
答案C
解析
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