阅读文段，回答下面的问题。

秦淮河月色

朱自清

     灯光究竟夺不了那边的月色；灯光是浑的，月色是清的。在浑沌的灯光里，渗入一派清辉，却真是奇迹！那晚月儿已瘦削了两三分。她晚妆才罢，盈盈的上了柳梢头。天是蓝得可爱，仿佛一汪水似的；月儿便更出落得精神了。岸上原有三株两株的垂杨柳，淡淡的影子，在水里摇曳着。它们那柔细的枝条浴着月光，就像一支支美人的臂膊，交互的缠着，挽着；又像是月儿披着秀发。而月儿偶然也从它们的交叉处偷偷窥看我们，大有小姑娘怕羞的样子。岸上另有几株不知名的古树，光光的立着；在月光里照起来，却又俨然是精神矍铄的老人。远处——快到天际线了，才有一两片白云，亮得现出异彩，像是美丽的贝壳一般。白云下便是黑黑的轮廓；是一条随意画的不规则的曲线。这一段光景，和河中的风味大异了。但灯与月亮竟能并存着，交融着，使月成了缠绵的月，灯射着渺渺的灵辉；这正是天之所以厚秦淮河，也正是天之所以厚我们了。

   One day a young man went to the town and bought himself a new pair of pants. When he got home, he went to his room and put them on. He found they were about two inches(英寸) long. He went into the kitchen(厨房). His mother and his two sisters were doing some washing there. He said to them,“ The new pants are too long. They need cutting(剪) by two inches. Would one of you do this for me?” His mother and sisters were busy and nobody said anything.
   But after his mother finished washing, she went to her son's room and cut the pants by two inches. She came back without saying anything to her daughters. After supper, the elder sister remembered her brother’s pants. She went to his room and cut the pants by two inches without saying anything to anyone. The younger sister went to the cinema. But when she came back, she also remembered her brother's pants, so she went to his room and cut them by two inches, too.

在如图，已知∠1=∠2，∠3=∠4，求证：AC∥DF，BC∥EF.证明过程如下：

∵∠1=∠2（已知），
∴AC∥DF（A．同位角相等，两直线平行），
∴∠3=∠5（B．内错角相等，两直线平行）．
又∵∠3=∠4（已知）
∴∠5=∠4（C．等量代换），
∴BC∥EF（D．内错角相等，两直线平行）．
上述过程中判定依据错误的是（ ）