【正确答案】 C

【答案解析】[听力原文]14-17 W: Oh! I am glad to see you. How are you going recently? They say you took Introduction to Seience, didn't you? M: I sure did. Why did you ask me about that? W: Well, I'm thinking about taking it next year. I want to know something about it beforehand. M: As far as I'm concerned, I suggest that you not take it. W: Why not? Is the professor awful or is the lecturing boring? M: The professor is nice enough. But the course is nothing but physics and chemistry with lots of equations. You can't just mix the right chemicals and watch what happens. As you go along you have to keep care notes and turn it all into a bunch of numbers and formulas after the experiment is over. It was the worst course I've ever taken. W: What you say is no problem for me. To tell you the truth, [ like formulas and numbers. That's what I'm different from you. M: Is it? Then you'll love it if it is the case. But all that I was interested in was biology and we didn't get to that till the last three weeks of the class. What a year! [精解] 这是个关于确认人物身份的题目。人物类的题目大致有：人物关系题；人物数目题；人物角色题；人物作用题等等。根据对话，这是两个人在讨论选修的课程。所以应该是两个学生。

【正确答案】 C

【答案解析】[精解] 这个题的思路出发点是通过“混淆视听”来检验考生信息辨别能力。大学里的课程如"biology，chemistry，physics"是大家很熟悉的，但这里他们所谈论的是“Introduction to Science(科学导论)”。而且这几个在对话中都有提及，考生很容易以常识为据，导致错选。