单项选择题

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 mov

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单项选择题

Parents and children often disagree about what is important or right because （）.

A．they have different styles of life
B．they hate each other
C．parents think that their children are troublemakers
D．they are in a society of rapidly changing social and moral values

问答题

正是那棵树在洪水中救了他们的命。