题目

What's the probable relationship between the two speakers?A.Mother and son.B.Manager and secretary.C.Secretary and customer. 答案：【答案】B【解析】【原文】W: My schedule next?M: You will be having a meeting tomorrow at noon.W: Oh, can the meeting be pushed forward a little bit? I have to pick up my mother at the airport then.已知：如下图，AB=10，P是线段AB上任意一点，在AB的同侧分别以AP和PB为边作两个等边三角形APC和BPD，则线段CD 的长度的最小值是 [     ]A．4B．5C．6D．3-5