题目

        —What would you like to do to relax yourself?        —I prefer          basketball rather than          magazines.A. playing; reading            B. to play; to read  C. play; read                     D. to play; read 答案：D如图，轻弹簧上端与一质量为m的木块1相连，下端与另一质量为M的木块2相连，整个系统置于水平放置的光滑木板上，并处于静止状态。现将木板沿水平方向突然抽出，设抽出后的瞬间，木块1、2的加速度大小分别为、。重力加速度大小为g。则有    A．，         B．，C．，    D．，