[originaltext] The Japanese have long been studied for their long life expec

The Japanese have long been studied for their long life expectancy, which is higher than almost anywhere else in the world. So why is the Japanese diet so healthy, and what do they eat?
    The traditional Japanese diet is largely fresh and unprocessed, with very little refined foods or sugar. A recent study by the British Medical   Journal found that those who stuck closer to the Japanese dietary guidelines— a diet high in grains and vegetables, with moderate amounts of animal products and soy but minimal dairy and fruit—had a reduced risk of dying early and from heart disease or stroke. As their diet is traditionally high in soy and fish, this may also play a significant role in this reduced risk of heart disease. The Japanese also have the lowest rate of obesity amongst men and women as well as long life expectancy.
    Okinawa, in southernmost Japan, has the highest number of longevity in the world as well as the lowest risk of age-related diseases. This has partly been attributed to their traditional Japanese diet, which is low in calories and fat yet high in nutrients.
    The Japanese diet isn’t that dissimilar to a traditional Chinese diet, with rice, cooked and pickled vegetables, fish and meat being staple choices. However, because Japan is actually a group of islands, its residents consume a lot more fish compared to other Asian countries. They also eat raw fish in sushi, plus a lot of fermented foods.
    Questions 19 to 22 are based on the passage you have just heard.
    19. What does the speaker say about the traditional Japanese food?
    20. What can we learn about Japanese dietary guidelines?  
    21. What can we learn about Japanese people?
    22. What makes Japanese diet distinct from that of other Asian countries?