听力原文：W: Sit down please, Mr. Johnson.
M: Nice to meet you, ma'am.
W: I have read your letter here. You seem to have done very well in school. Can you tell me something about your schoolwork？
M: As you can see, my strongest subjects were art subjects. My best subject was history, and my second best was geography. However, my favorite subject was math, and the results 1 got in the math paper were quite reasonable.
W: That' s hue. Now, can you tell me why you think these subjects will help you in this job？
M: Well, ma' am, I understand that you manufacture computers, prepare software, and advise diets on how to use them. Is that right？
W: What's right.
M: And I've been told that working with computers needs a logical mind rather than great skills in mathematics. That' s especially true, I believe, when it comes to writing programs. So I think my results show that I have some ability in logic and in mathematics as well.
W: So, you would like to write material for computers, would you？
M: Yes, ma'am. That's what interests me most about computers, writing programs. But I think the computer industry itself is still expanding enormously. I' m sure that career prospects in the industry would be very good.
W: I see. Well, thank you. I've enjoyed our talk. We'll be writing to you.
M: Thank you, ma' am. Goodbye.
(20)

A. history
B. geography
C. mathematics
D. art