题目

连结三角形的一个顶点和它______的______叫做三角形这边上的中线． 如右图，若BE是△ABC中AC边上的中线，则AE______ 答案：所对的边的中点、线段，＝，AC— We can use QQ to talk with each other online.— Really? Could you please show me _______ it?A. what to do???????? B. how to do????? C. when to do???? D. why to do