题目

The second–hand car Amy bought last month is almost new; _____, it is in excellent condition.   A. besides        B. in addition to        C. instead                D. yet   答案：A在同一高度以相同速率分别竖直上抛、竖直下抛质量相等的甲、乙两个小球，到着地过程中，它们的动量改变量的关系是 [　　] A．相等    B．甲比乙大    C．乙比甲大   D．无法确定