题目

（   ）I can’t remember when exactly      Robinsons left city, I only remember it was      Monday. A．the; the            B．a; the        C．a; a          D．the; a 答案：D 解析: 略如图，等腰△ABC中，AB=AC，∠BAC=50°，AB的垂直平分线MN交AC于点D，则∠DBC的度数是 ．