单项选择题
A．so B．very C．quite D．too
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
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