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Conversation one Why is the trip to Mars a one-way trip

A、The return trip is too expensive.
B.There is no technology to get people back.
C.People don’t want to return.
D.The return trip is too risky.
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根据网考网移动考试中心的统计,该试题:

24%的考友选择了A选项

50%的考友选择了B选项

10%的考友选择了C选项

16%的考友选择了D选项

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