听力原文：F: Hello, Jim. What's your problem? M: Hi, Doctor Lee. I don't feel well. F: What symptoms did you get? M: You know, cough, fever, runny nose, my head and bones ache, chills even. I was miserable for a week and it ended up mining my holiday. F: Sounds like a typical flu to me. It often strikes when people are overtired, stressed out and not eating nutritious food. And also you increase your exposure to a virus when you're in big crowds where lots of people are coughing and sneezing. M: I certainly spent a lot of time in department stores in the holiday buying gifts for people. F: Yes. And so you increase your exposure to airborne viruses just when your body's resistance is already low from all the running around you do. M: So what can I do to ward off the flu? F: Actually it's fairly simple. Get a lot of rest, eat well. That way your immune system will be boosted. And you'll be more able to fight off illness. M: All these things make sense. But one more question. Aren't I bound to get sick anyway if there's an outbreak in the dorm? F: Oh, you didn't mention you lived in the dormitory. In that case I'd also suggest you get immunized. The vaccine available prevents the three main types of influenza. Why don't you go to the university health center? The shots are free them. M: I'll do it right away. It will be nice to feel well during the holidays. (23)