题目

如图，正方体ABCD-A1B1C1D1的棱长为3，则以A、C、 20080429  B1、D1为顶点的四面体的体积是       A．27                      B．18               C．                  D．9 答案：DIt ______ be better if I could earn enough money to buy a private car.A．willB．mustC．shallD．would