When the astronauts are working, sleeping bags are fastened______. [br] How long

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问题 When the astronauts are working, sleeping bags are fastened______. [br] 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

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Whentheastronautsareworking,sleepingbagsarefastened______.[br]Howlong