问题描述：
介词搭配问题
1.In China,the price of TV sets has been reduced ______30% in the last three years.
A.on B.by C.with D.for
2.He entered the room,closed the door and put a table _______the door.
A.on B.at C.against D.off
3.零摄氏度以下用below,零摄氏度以上用over还是above?
1.In China,the price of TV sets has been reduced ______30% in the last three years.
A.on B.by C.with D.for
2.He entered the room,closed the door and put a table _______the door.
A.on B.at C.against D.off
3.零摄氏度以下用below,零摄氏度以上用over还是above?
问题解答：
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