题目

（1）画出绕点“O”顺时针旋转90度后的图形．（2）在方格纸上设计一个轴对称图形，并画出它的一条对称轴． 答案：根据题干分析画出三角形顺时针旋转90度后的额图形，再根据轴对称图形的定义性质设计这样一个如图：There was a lot of fun at the party. You ________, but why didn't you? [     ]A. should come  B. ought to have comeC. may have come  D. must have come