听力原文：F: Good morning, Andy. M: Good morning Jessie. What can I do for you? F: Look, several days ago, I changed my job to be a trainer in a big company. And I suddenly feel uncomfortable with my present hairstyle. M: How come? F: You see, the trainees regard me as their teacher and respect me very much. But my boss is not satisfied with my hairstyle. He said I look too naive with this hairstyle. And also I' m terribly busy with my work, so I can hardly have time to look after such long hair of mine. M: I see. Yes, you have a bang that usually makes one look younger than they are. So does your ponytail and hair clips. F: That' s exactly what my boss said to me. So I want to make a change. Can you give some advice? M: What about having your hair cut short? It will make you look more matured and more professional. To be a trainer, you need to make people trust you at the first sight. I will give you a magazine. You can chose one from the many hairstyles in it. F: Thanks. Do you have any good ways to keep my hair healthy? M: Fist of all, you should eat a balanced diet and get plenty of exercise. Look after your hair at home. City air is dirty and polluted, so it would be wise for you to shampoo your hair frequently. After shampooing, dry your hair gently with a towel before using the hair dryer. Always set it at a low temperature and hole it at least 10em from your hair. F: Thanks you Andy. Why does Jessie want to change her hair style?