问题详情

Why does an astronaut put his hand under his belt when he sleeps？
A.Because he thinks it is comfortable to sleep in that way in space.
B.Because he doesn’ t want to touch any controls when he sleeps.
C.Because the instruments of the spaceship are easily broken.
D.Because he is afraid that the seat will move.请帮忙给出正确答案和分析，谢谢！