题目

—I’m often worried. Can you think of a method to help me ______? —Well, you can play ball games. Sports may make you ______. A. relax; relaxed      B. relaxed; relax   C. relaxing; relaxed   D. relax; relaxing 答案：A13．下列命题中，错误的是（　　）A．矩形的对角线互相平分且相等B．对角线互相垂直的矩形是正方形C．等腰梯形同一底上的两个角相等D．对角线互相垂直的四边形是菱形