题目

---It's time to do your homework, Vance. ---Yes,Mum. I'll turn off the TV as soon as the cartoon_____. A.ends          B.end          C.will be ended    D.will end 答案：A一水平抛出的小球落到一倾角为的斜面上时，其速度方向与斜面垂直，运动轨迹如右图中虚线所示。小球在竖直方向下落的距离与在水平方向通过的距离之比为 A． B． C． D．