Why is the trip to Mars a one-way trip？A．The return trip is too expensive.B．There is no te

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.

请帮忙给出正确答案和分析，谢谢！

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