题目

His father is a doctor. He works in a h. 答案：【1】hospital下列判断正确的个数是：①平行四边形的对角线互相平分；②每条对角线平分一组对角的矩形是正方形；③对角线互相平分的四边形是平行四边形；④对角线相等的四边形是矩形。 [     ]A.0个B.1个C.2个D.3个