题目

_______, the middle-aged woman still keeps modest and never shows off her great skill. A. Famous star as she is                B. As she is famous star C. A famous star as she is              D. As she is a famous star 答案：A如图所示，A、B、C三个一样的滑块从粗糙斜面上的同一高度同时开始运动，A由静止释放，B的初速度方向沿斜面向下，大小为v0，C的初速度方向沿斜面水平，大小也为v0，下列说法中正确的是     A．滑到斜面底端时，C的动能最大 B．滑到斜面底端时，B的动能最大 C．A和C将同时滑到斜面底端 D．C一定是最后滑到斜面底端