A、Classmates. B、Mother and son. C、Teacher and student. D、Headmaster and student. C事实细节题。男士感谢女士对自己的帮助，女士说作为男士的指导老师，这是她应该做的。因此，二者是

W: You look better today. How did your test go?
M: Much better than it did yesterday.
W: Did you pass?
M: (19)I not only passed it, but I got high marks! I’m so happy!
W: You should be. You worked really hard last night preparing for it.
M: Thank you for helping me with it. If you hadn’t encouraged me to do my best, I wouldn’t have ever been able to pass.
W: You don’t have to thank me. (22)It’s just a part of my job as your counselor.
M: Did you always do well in high school?
W: No, in fact, I was terrible at taking exams.
M: Really?
W: Sure, but my teachers always encouraged me to do the best and that helped me a lot. By the way, when are your final exams?
M: In about two months.
W: When do you plan to prepare for those exams?
M: Well, (20)most students just cram the night beforehand.
W: Do you think that’s a good idea?
M: No, I think I should study a little bit at a time, starting a few weeks before the exam.
W: That sounds like a good idea. What are you going to do if you have any questions while you’re studying?
M: (21)I’ll go and talk to my professor or a learning support assistant.
W: Sounds like you’ve learned something useful this year!
19. Why does the man look so happy today?
20. When do most students prepare for exams according to the man?
21. What will the man do if he has any questions during the study?
22. What is the relationship between the two speakers?