题目

——Are you going to take part in the speech contest? ———_____________It’s too good an opportunity to miss. A. No problem!                    B. That’s for sure. C. Why me?                       D. Why bother?   答案：B关于摩擦的说法正确的是（　　）A．轴承里加润滑油可以消除摩擦B．用滚动代替滑动可大大减小摩擦C．鞋底上的花纹是为了防止摩擦D．路面没有摩擦车辆将行驶得更快