题目

- It’s dangerous to walk across the street carelessly.      --You’re right. We can’t be ________ careful while crossing the street. A. so           B. very          C. too                        D. more 答案：C甲、乙两个运动物体，已知它们通过的路程之比为1︰2，所需的时间之比为3︰5，则甲.乙两物体的速度之比为（   ）A．10︰3B．3︰10C．5︰6D．6︰5