单选题AIt takes a couple of days.BOnly children need some training.CIt’s unnecessary.DIt takes a few months.
单选题
A
It takes a couple of days.
B
Only children need some training.
C
It’s unnecessary.
D
It takes a few months.
参考解析
解析：
关于训练，男士提到因为有一分钟左右的巨大重力和火箭回到地球前几分钟的失重状态，他们需要通过几天的训练(a couple of days’ training)来适应。
关于训练，男士提到因为有一分钟左右的巨大重力和火箭回到地球前几分钟的失重状态，他们需要通过几天的训练(a couple of days’ training)来适应。
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