甲:你注意到没有,记平行四边形的特征比记平行四边形的识别条件容易得多?只要记住平行四边形的特征,识别的记法就水到渠成. 乙:为什么这样说呢? 甲:我来问你,你还记得平行四边形的特征吗? 乙:那当然了,平行四边形的两组对边分别平行且相等,两组对角分别相等,两条对角线互相平分. 甲:你说的一点也没错,那在如图1的(?)ABCD中,你能一一地指出 A: You haven’t noticed that it’s easier to memorize the features of a parallelogram than to recognize the conditions of a parallelogram. As long as you remember the characteristics of the parallelogram, the notation of recognition will come to fruition. B: Why do you say this? A: I ask Do you still remember the characteristics of the parallelogram? B: Of course, the parallelogram’s two groups of parallel sides are equal and equal. The two sets of diagonal angles are equal, and the two diagonal lines are evenly divided. A: You’re talking about That’s right, that’s what you can point out one by one in the (?)ABCD in Figure 1.