题目

Susan was determined to work hard at her lessons this term to ________ the expectations of her parents. A . live up to B . come up to C . get down to D . look forward to 答案：A如图，A，B，C为⊙O上三点，∠ABC=60°，则∠AOC的度数为（ ）A．30°B．60°C．100°D．120°