题目

如图，已知∠AOB是直角，∠AOC是锐角，ON平分∠AOC，OM平分∠BOC，则∠MON是（    ）A、45º                     B、45º+∠AOC  C、60°－∠AOC          D、不能计算  答案：A解析:略 I like this jacket better than that one, but it costs almost three times______. A. as much    B. as many    C. so much    D. so many