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閱讀理解
Many years ago,lots of zoos kept many kinds of animals in small cages．Small cages made it easy for people to see the animals,but a small cage is not a good place for an animal to live in．Today zoos keep animals in different kinds of cages．The cages are very big and open．They usually have plants and a little lake．The cages look like the animals' habitats(棲息地)．
Zoos help to protect animals in the wild．How do they do this?Zoos teach people how animals live in the wild．Zoos want people to protect the animals' wild habitats．
Many plants and animals are going extinct．Mammoths(猛犸象),which are related(有關(guān)的)with Asian elephants,are now extinct．There are no mammoths in the world today．Scientists say that seventy-four different kinds of living things go extinct every day!
Zoos are working together to stop animals from going extinct．
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