题目

如图⊙O的半径为1cm，弦AB、CD的长度分别为，则弦AC、BD所夹的锐角＝      ．  答案：75°解析:略  －I plan to go out for a trip, but I'm afraid I don't know the ________． －A map is helpful, I think． [　　] A．price B．way C．time