题目

如图，给出如下推理：①∠1＝∠3．∴AD∥BC；②∠A+∠1+∠2＝180°，∴AB∥CD；③∠A+∠3+∠4＝180°，∴AB∥CD；④∠2＝∠4，∴AD∥BC.其中正确的推理有_____．(填序号) 答案：【答案】②④.【解析】根据平行线的判定方法去解答.解：①∠1＝∠3．∴DC∥AB；③∠A+∠3+∠4＝180°，∴AD∥BC；正确的有②④.故答案为：②④.— Come on, baby! You will succeed. We all wish to get good news.  — ____, but I'll do my best. [     ]A. No problem B. It is impossible        C. I can't promise      D. Don't worry