听力原文： Cheese, nutritious food made from the milk of cows and other mammals, including sheep, goats, buffalo, camels, and mares./Cheese is one of the world' s oldest food products--for thousands of years,/people have raised animals for milk, turning their surplus milk into cheese./More than 400 varieties of cheese exist, making it one of the most general foods in the world./ Cheese comes in hundreds of different shapes, sizes, flavors, and is used in as many different ways J Enjoyed with bread, crackers, and fruit, used as an ingredient in cooked foods, or mixed with salads and flour,/cheese is a healthy food all over the world./ Cheese is a concentrated source of almost all the valuable nutrients found in milk, such as protein, vitamins, and minerals,/as well as the less desirable fat and cholesterol, substances that may lead to health problems when consumed in excess./Because of its high protein and calcium content, cheese in moderation is an important component of a balanced diet./ (1)