听力原文:W: Can you recognize me, David? M: Why, are you Margaret? W: Sure, I am. We haven't seen each other for over twenty years. M: You haven't changed so much. W: You haven't either. M: Remember the days when we were together? We used to go out for a walk every evening after supper. W: And my mother used to say that we are more like brother and sister than friends. M: Those good old days! (18)