题目

如图，A、B为是⊙O上两点，C、D分别在半径OA、OB上，若AC=BD，求证：AD=BC。 答案：略—I’11 be away on a business trip. Would you mind looking after my cat? —Not at all. A. I’ve no time　　　　 B. I’d rather not　　　　　 C. I’d like it　　　　　 D. I’d be happy to