题目

 She always does well at school________ having to do part­time jobs every now and then. A．in spite of           B．in case of           C．on account of     D．regardless of 答案：A如图所示，动能和势能之间没有发生转化的是（　　） A、匀速行驶的压路机B、上升的滚摆C、用弓将箭射出去D、过山车向下俯冲