题目

—— Do you mind my opening the window? It’s a bit hot in here.      —— ______ , as a matter of fact A. Go ahead      B. Yes, my pleasure C. Yes, I do      D. Come on 答案：C 解析:考查交际用语 如图，半径为3的⊙O内有一点A，OA=，点P在⊙O上，当∠OPA最大时，PA的长等于（　　） A．             B．           C3 D．           2