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Modern zoos are very different from zoos built fifty years ago. At that time, zoos were places 1 people could see animals from many parts of the world. The animals lived in 2 with iron bars. The cages were easy to keep clean. However, for the animals, the cages were small and impossible to hide. Although the zoo 3 took good care of them, many of the animal did not feel comfortable, and they often became 4 . In modern zoos, people can see animals in more 5 conditions. The animals are given more freedom in larger places 6 they can live more freely as they would in nature. Even the appearance of zoos has changed. Trees and grass grow in the cages, and water flows 7 the places that the animals live in. There are few bars, 8 there is often a deep ditch, filled with water, which surrounds a space where several 9 of animals live together as they would naturally. In an American zoo, the visitor can walk 10 a huge special cage that is filled with trees, some small animals and many birds. And it is large enough for all the birds to live naturally. In a zoo in New York, because of special night 11 , people can observe certain animals that are 12 only at night when most zoos are closed. Some zoos have special places for visitors to 13 animals that live in the desert or underwater. Some other zoos have special places for animals that live in cold conditions like the 14 from the Arctic. Modern zoos not only show animals for visitors, but also 15 and save rare animals. For this reason, fifty years from now, the grand children of today’s can still be able to enjoy watching these animals.
The mysterious tiger has been a symbol of power and strength for centuries. Its power is a challenge to hunters, 1 have tried to kill it to prove their own skill and 2. In India throughout the nineteenth and early twentieth century, large parties or 3 from around the world used to go out on huge tiger hunts. Hundreds of tigers could be killed in a few weeks. As a 4 of this over-hunting, 5 with loss of habitat(栖息地), the population of tigers in India dropped from about 40,000 6 the turn of the twentieth century to about 2000 by 1972. With the help of India and other concerned countries, the World Wildlife Fund 7 Operation Tiger in 1972 to save the tiger 8 dying out. Since then, seventeen tiger preserves(保护区) have been 9, and the tiger population in India has risen to between 4000 and 5000. But When people live on the 10 of the tiger preserves, tigers sometimes kill their farm animals and attack people—about 600 people in India have been killed by tigers in the last dozen years. 11 tigers do not eat humans. But “old, wounded and homeless” tigers can become habitual (习惯的) man-eaters. In one area in India, villagers have 12 a clever solution. They wire lifelike human dummies(假人) to electricity 13 the tigers get an electric shock when they attack. It is hoped that in this way tigers will learn to 14 people. But the conflict between human and tiger 15. Only if people have enough food, shelter and fuel will the tiger survive in the long run. And only if the tiger and its forest survive will people have a natural world they can return to.