【单选题】听力原文: Why do so many people live to a healthy old age in certain parts of the world? [31] What is the secret of their long lives? Three things seem to be very important: [29] fresh air, fresh food and...
【简答题】In many parts of the world, people live to a healthy old age. What is the secret of their long lives? Three things are very important: fresh air, fresh food and a way of life. People who live i...