A、Professor and student. B、Boss and employee. C、Interviewer and interviewee. D、President and adviser. C选项均是一对身份相对的词表明，本题考查对话双方的关

W: Tell me a little bit about yourself, please.
M: My name is David and I live in Shanghai. I was born in 1980, and my major in college was electrical engineering.
W: I see by your resume that you have been working?
M: Yes, I have worked for two years with an American company.
W: May I ask why you left the former company?
M: I would like to get a job in which I can further develop my career and seek new challenges.
W: Tell me what you know about our company, please.
M: I learned some information of your company via Internet. And I know that the company was founded in New York in 1950 by Mark Ward, who was also the first president. It has 2 billion dollars in capital; it employs 15,000 people, and it is the largest company in its field in the States.
W: What do you know about our products and our share of the market?
M: Your company’s products are mostly marketed in Europe and the United States, but particularly has sold very well here in China. So I think in the future you’ll find China to be a profitable market as well.
W: What kind of personality do you think you have?
M: Well, I approach things very enthusiastically, I think, and I don’t like to leave things half-done. I’m very organized and capable.
W: What would you say are your weaknesses and strengths?
M: Well, I’m afraid I’m a poor speaker; however, I’m fully aware of this, so I’ve been studying how to speak in public. I suppose my strengths are I’m persistent and a fast-learner.
19．What’s the relationship between the two speakers?
20.What can we know about the company according to the conversation?
21.What does the man think of himself?