题目

 They have been waiting for many hours to see the singer, but the airplane must have been _____.    A. behind the times    B. behind schedule   C. ahead of time      D. in no time   答案：B3．如图，△ABC中，AB=AC，BD是∠ABC的平分线，A、B、D三点的圆与BC相交于点E，你认为AD=CE吗？如果不能，请举反例；如果AD=CE，请说明理由．