题目

 Generally speaking, if ______ strictly following the instructions, the electric bike is not as dangerous as reported.    A. riding           B. being ridden      C. to be ridden     D. ridden 答案：D下列变化中有一种和其它三种有本质区别的是（　　） A、矿石粉碎B、纸张燃烧C、酒精挥发D、干冰升华