听力原文：M: Good morning, the Dean's office. W: Hello, this is Mary Smith speaking. I was just calling before I left my dorm room to make sure that I had an appointment with Dean Maply this morning at 10:00 o'clock. M: Please wait a minute. I'll check with his secretary. W: Ok, thank you. M: Hello, Miss Smith. W: Yes. M: He looked at his calendar and he doesn't have your appointment in his book for 10:00. W: But...that's impossible. Please check it again. I'm sure I have made an appointment with him. M: Sorry, Miss Smith, I will call his secretary to check. By the way, when did you make the appointment? W: On Tuesday, two days ago. M: Wait a minute. Hello, Miss Smith, Dean Maply is waiting to see you at 10:00 o'clock and I'm sorry for that mistake. W: Never mind. And thank you. I'll be right over after breakfast. M: All right, Good-bye. W: Good bye. (23)