题目

—The cake is so delicious. Would you like            ? —No ,thanks. A. more some    B. some more    C. any more    D. some much 答案：B如图所示，木块的下面拴一铁球悬浮在水中，当把细线剪断后，木块的重力势能__________，铁球的重力势能__________，水的重力势能__________。（选填"增大""减小"或"不变"）