题目

                                   I Am Truly Grateful That I Had Cancer At the age of 10, I was diagnosed with cancer.  During treatment, I understood everything but the   21   of my case.  It was not until recently that I realized how sick I was then.    This November of 2015 will   22   my five years off chemotherapy(化疗) and I will be finally   23  of cancer. I know sick children often felt blue.  In order to help brighten their   24  , I created a program through which I brought celebrities(名人) children   25   and 匀速圆周运动属于（　　）A．匀速运动B．匀加速运动C．加速度不变的曲线运动D．变加速度的曲线运动