题目

如图，△ABC的三边长分别是6cm、8cm、10cm，现在分别取三边的中点E、F、G，顺次连结E、F、G，则△EFG的面积为          答案：6 cm2 解析:略 — You ought to have called him yesterday ． — Yes，I know I ________.       A．ought to   B．have to   C．should have           D．must have