【正确答案】 A

【答案解析】原文：M: Biology department, Webster speaking.W: Hello Professor Webster. This is Janet Hill calling. I live two doors down from Professor Don Williams. Don asked me to call you, because he has got a terrible cold and lost his voice.M: Lost his voice? Oh, I’m sorry to hear that. Is there anything I can do for him?W: Well, he has a class this afternoon from 2’- 30 to 4:00, and he won’t be able to teach it.M: Does he want me to try to find somebody else to teach the class?W: No, not exactly. What he wants to do is to get someone to go in for him, just to pass back the mid-term exam papers.M: His class is at 2-30, you say? Well, I’m free at that time and I could do it for him. What room is his class in?W: Carter Hall, Room 214. You can get the papers in his office.M: OK, that’s fine.W: Thank you very much, Professor Webster.M: That’s all right. Thank you, and hope Don will get better soon.