题目

阅读短文，选择合适的选项。 I like sports. I have ten tennis balls, seven basketballs, four volleyballs and five soccer balls. I play tennis with my friends every day.(Lucy) I have five baseballs, five volleyballs, two soccer balls. I like ping-pong. It's easy for me. I often play ping-pong with my classmates. I also(也)have three ping-pong bats and some ping-pong balls.(Mary) I don't have any(任何的)balls. I love sports, but I don't play them. I only watch them on TV.(Alice) （1） Lucy and Mary have ________ volleyballs. A . four B . five C . eight D . nine 一物体做匀变速直线运动,初速度为2 m/s，加速度大小为1 m/s2，则经1 s后，其末速度 (　　)A. 一定为3 m/s B. 一定为1 m/sC. 可能为1 m/s D. 不可能为1 m/s