题目

Japanese people, who never miss a chance to be photographed, were lining up to get their pictures on a postage stamp. Vanity (虚荣)stamps with personal photographs went on sale for the first time in Japan as part of an international postage stamp exhibition. The customer’s photo was taken with a digital camera and then printed on stamp sheets, a process that takes about five minutes. Sold in a sheet of 10 stamps for $8. 80, little more than the cost of lunch in Tokyo, each stamp printed a different scene from a traditional painting along with the photo. The stamps can be used norm下列说法中正确的是A.没有了摩擦力我们还可以像现在这样行走B.人的手把橡皮筋拉长，人的手不会受到橡皮筋弹力的作用C.拉伸弹簧才能产生弹力，压缩弹簧就不能产生弹力D.从高处把篮球抛向地面，篮球撞地后会反弹是因为地面给它一个弹力