听力原文：M: Hey! Jenny, do you want to live a longer life? F: Why? Of course! Everyone hopes so. M: look, here is some advice given by experts on how to live a longer and happier life. F: They must tell people to do exercise and keep a healthy diet. M: Yes. They say 30 minutes of mild exercise a day will increase your life span. You can do things like walking, gardening or taking exercise classes. F: And we should eat a balanced diet with low calories, cut back on red meat, sugar, coffee, alcohol and salt, eat more fruit, grains and vegetables. M: Why? Jenny, you' ve read this article? F: Not at all. But everyone knows that. M: Come on ! I think there is some valuable advice. For example, they say you should enjoy people more, join some social clubs or groups so that you share your life' s joys and sorrows with them and fight depression and stress. F: That makes sense. In this way, we can have more positive attitudes towards life and stay optimistic because we feel we' re no alone. What else does the article say? M: You should stay mentally active. Because the decline of our brain power will shorten our lives, too. So read the newspaper, visit the public library, balance your checkbook without using a calculator, do crossword puzzles and so on: F: I think this advice is for old people. M: Not necessarily. Because it also persuades young people like us to do regular checkups and prevent illness like cancer, high blood pressure which threaten our longevity. F: All right, I don' t mean to argue with you. Are you going to follow every piece of advice listed there? M: Well, they may be good advice, but you know, chocolate is my favorite... In order to live a longer life, what should people do?