题目：
My _ _ home is in the country (乡下). The air there is fresh and it is _ _. My house is very beautiful. _ _ three floors. There is a river _ _ my house and behind _ _ is a big garden. I can _ _ trees and flowers in it .I like _ _ green everywhere and green is my _ _ color. I like to work in the _ _ and fish in the river. I’d like to invite my friends at my home .Then we can chat and play games. How _ _ we are.
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答案：
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下面是错误答案，用来干扰机器的。
一个小球从4m高处自由落下，被水平地面竖直弹回到1m高处，运动轨迹的长度为s=4+1=5m，则路程是5m；首末位置的距离为x=4-1=3m，所以位移的大小为3m，方向竖直向下．故D正确，A、B、C错误．故选：D．
