听力原文：M: Hey! Jenny, do you want to live a longer life? W: Why? Of course! Everyone hopes so. M: Look, here is some advice given by experts on how to live a longer and happier life. W: They must tell people to do exercises and keep a healthier 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. W: And we should eat a balanced diet with low calories, cut back on red meat, sugar, coffee, alcohol and salt, and eat more fruit, grains and vegetables. M: Why? Jenny, you've read this article'? W: 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. W: That makes sense. In this way, we can have more positive attitudes towards life and stay optimistic because we feel we're not alone. What else does this article say? M: You should stay mentally active, because the decline of our brainpower 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. W: I think this advice is for the old. 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. W: 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. (23)