12/twelve这是一段简短对话。本题考生关键是听懂第三个话轮中男士对课程要求的介绍。其中第三句说：They must read at least a dozen of books totally...，此外还要明白a dozen of(一打)指的是数字

M: Come in, please. What can I do for you?
W: Professor Donald, are you giving your advanced geology course again next semester?
M: Yes, I’m planning on it.
W: I wonder if I could enroll in it. I know it’s a graduate course and I am only a junior, but...
M: Aren’t you a bit young? I’ve allowed qualified seniors to take the course. They must read at least a dozen of books totally and are required to write the same number of book reviews and one additional report. They usually have a hard time keeping up.
W: I know, but the geology of the American West is my major interest and I’ve done a lot of reading in the field. Last semester I took Professor Barman’s course, and I didn’t find it nearly challenging enough.
M: I see. You certainly aren’t one of those students who are out for easy grades.
W: I should say not. I really want to learn something.
M: Well, I’ll speak to Professor Barman about it. If be thinks you are ready, I will let you enroll. You may call me on Thursday night or just come here on the next morning to get the result.
W: Oh, thank you, Professor Donald. That is really very nice of you.