A:is worthy of being wo
B:is worth its while to be winning
C:deserves to wi
D:promises to lose
Why ____ he ____ (like) pandas?
如图,O为矩形ABCD对角线的交点,DE∥AC,CE∥BD.(1)试判断四边形OCED的形状,并说明理由;(2)若AB=6,BC=8,求四边形OCED的面积.
已知正方体ABCD﹣A1B1C1D1的棱长为1,点E是棱B1B的中点,则三棱锥B1﹣ADE的体积为____