听力原文： Elephants live mostly on grass, leaves and fruit. They also eat the twigs and bark of trees. The quantity of food and water which they consume is enormous, and they can be very destructive in their search for food, There are two main types of elephants. There is the Asiatic elephant, which is found in India, for example, and the African elephant. Superficially they are very much alike, but the African elephant is generally larger. One characteristic of Asiatic elephants is that they do not like being exposed to the sun, and consequently they prefer to live in shady places. They are also very fond of bathing. Apart from that, the most important difference between the two varieties is that the Asiatic elephant is more easily trained. Elephants in India, for example, have been caught and tamed for many hundreds of years. We have already noted that they have good memories, and it is this that makes them easy to train. Since they are immensely strong, they can carry and drag huge objects, such as the trees and rocks. This makes them extremely valuable as beasts of burden. (30)