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.
Questions 19 to 21 are based on the conversation you have just heard.
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?