听力原文：M: Come in, come in! What can I do for you? W: Professor Johnson, 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'm only a junior, but... M: Aren' t you a bit young? I've allowed qualified seniors to take the course and they usually have a hard time keeping up. W: ! 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 Williams' 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 Williams about it, ff he thinks you're ready, I'll let you enroll. W: Oh, thanks. Professor Johnson, that's really very nice of you. The woman talks to the professor______