题目

They (buy) her a new bike for herbirthday last week. 答案：【1】bought18．如图，直线AB，CD相交于点O，射线OM平分∠AOC，ON⊥OM，若∠CON=55°，则∠AOM的度数为（　　）A．35°B．45°C．55°D．65°