【答案解析】[听力原文] M: Have you made a decision on who will be the emcee for the president's award ceremony? W: A. After some careful thought, we decided to hire a professional presenter. W: B. I'm sure it will be a great event, no doubt. W: C. I think we asked her already and she flatly turned us down. 选项A正确，emcee与presenter意思相近，男士询问女士颁奖典礼主持人是否确定。选项B错误，女士在表达个人对典礼的看法。选项C没有说清楚谁会是主持人。
单选题17.
【正确答案】
C
【答案解析】[听力原文] W: Do you have any recommendations as to who I can list as a personal reference on my C.V.? M: A. It actually doesn't refer to any person that works here. M: B. If I were you, I wouldn't take this so personally. M: C. Unless you have someone else in mind, you can use me. 选项A混淆了person(人)和personal(个人的)。选项B错误，回答混淆了personal和personally(就个人而言)。选项C正确，男士称自己可以做女士的推荐人。
单选题18.
【正确答案】
C
【答案解析】[听力原文] M: Is there anyone in the company who doesn't know how to use the metric system? W: A. I think I'll use it later, if you don't mind. W: B. I think the present system works very well in the circumstances. W: C. I think the new marketing rep we hired from the U.S. doesn't. 选项A没有回答“谁不懂”这个问题。选项B误解system的意思，system在这里是“制度”而不是“系统”。选项C正确，女士称从美国新雇来的销售代表不知道如何使用米制。
单选题19.
【正确答案】
A
【答案解析】[听力原文] W: Does anyone know why the client walked out in the middle of the meeting this afternoon? W: A. If you ask me, she looked really upset about something somebody said. W: B. No, she walked straight out at the beginning and never came back. W: C. I'm afraid I didn't catch exactly what she was talking about. 选项A正确，回答暗示她可能遇到问题。选项B回答的是时间。选项C混淆了walk和talk。
单选题20.
【正确答案】
B
【答案解析】[听力原文] M: If you can't persuade him to change his mind, why don't you just agree with him? W: A. I don't agree with you at all. W: B. That's exactly what I did! W: C. He doesn't think so, either. 选项A错误，女士应该是和“他”意见不一，而不是提问者。选项B正确，女士无法说服第三人“他”，最终迁就“他”。选项C错误，回答是对第三人想法的断言，不合逻辑。