Modern zoos are different from those built fifty years ago. Those zoos were places where people could go to see animals from many parts of the world. The animals lived in cages with iron bars. Although the zoo keepers took good care of them, many of the animals did not feel comfortable, and they often felt ill. In modern zoos, people can see animals in more natural conditions. The animals are given more freedom in nature. Even the appearance of zoos has changed. Trees and grass grow in cages, and water flows through the places the animal live in.  there are few bars; instead, there is often a deep ditch, filled with water, which surrounds a space where several sorts of animals live toge ther as they world naturally. In an American zoo, the visitor can walk through a huge special cage that is filled with trees, some small animals and many birds, and large enough for birds to live naturally. In a zoo in New York, with the us of special night, people can observe certain animals that are active only at night, when most zoos are closed. Some zoos have special places for visitors to watch animals that live in the desert or under water. Modern zoos not only show animals to visitors, but also keep and save rare animals. For this reason, fifty years from now, the grandchildren of today’s visitors will still be able to enjoy watching these animals 小题1:It seems that ______ is something most important for animals. A  eating good food                B. living in cages C. living with other animals           D. living in natural co nditions 小题2:In modern zoos __________. A．different kinds of animals are kept separately. B．Animals are no longer taken good care of. C．Animals have more freedom D．visitors can walk where they live 小题3:In modern zoos ___________ feel comfortable. A．the animals, the zoos keepers B．the visitors, not the animals C．neither visitors nor animals D．both visitors and the animals 小题4:In some zoos people can ____________. A．walk through huge special cages to watch all sots of animals B．see animals which live in special conditions C．during the day observe animals that are active at night. D．Watch all rare animals that may ot be seen in the future 小题5:The main idea of the passage is that __________. A．zoos are now places where animals can live naturally B．zoos are places where people can see animals from all over the world C．there should be old and modern zoos alike D．rare animals may soon die out