听力原文：M1: Hello. M2: Tom, this is Steve. M1: Steve, wow. It's great to hear from you. How are you doing, cousin? M2: Great, and I promise I'll make this quick, because I know you're probably beading out to the hospital, right? M1: Hey, I've got all the time in the world. Ten minutes. Besides, I'm waiting for my frozen dinner to cook, so tell me, what's up? M2: Well, dad tells me you two had a long talk on the subject of my future. M1: Right, and you are thinking about becoming a doctor, aren't you? I didn't know you had such good sense. M2: Tom, I don't know where dad got this 'surgeon' idea. Because I haven't really decided what I want to do... what I want to be... you know? I mean, I'm not really sure right now that I even want to be a doctor. M1: Aha. M2: I mean, I'm interested, but I'm interested in a lot of other things too. M1: Like photography, for instance. M2: Yeah, exactly. You know all about that? M1: Sure I do. I don't think I can remember ever seeing you without a camera slung around your neck. M2: It's getting worse. This year I'm taking practically all the pictures for the school yearbook. I've built my own dark room, and I'm up to my armpits in negatives. M1: Terrific! And that just goes to prove what I was telling your dad. It's early yet to decide what you're going to do with your life. After all, you are only.., seventeen years old and I think when you enter the college, you may choose some courses like geography, biology and other courses like art, music... [fade out] What's the relationship between Tom and Steve?