阅读理解。

　　Years ago, many zoos kept all kinds of animals in small cages(笼子). 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(栖息地).

　　Zoos help to protect all kinds of animals. They protect animals in the zoo and they protect animals in the wild. How do they do this? Zoos teach people how animals live in the wild. Zoos want people to help protect the animals' wild habitats.

　　Many plants and animals are going extinct. Mammoths, which are related(有关联的) with Asia 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.

1．Zoos kept animals in small cages so that people can ________.

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2．Today, zoos keep animals ________.

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3．To protect animals, zoos ________.

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A．are trying to keep all kinds of animals

B．are trying to free the animals

C．teach people more about animals

D．want people to feed the animals

4．A mammoth is a kind of ________ that has gone extinct.

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5．An animal or a plant that is going extinct ________.

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A．no longer exists(存在) in the world

B．comes into this world soon

C．becomes very dangerous

D．has fewer and fewer living members

A. hungry    B. look up   C. are used to   D. fair E. However   F. without   G. look after    H. offer   I. freely

Nowadays there's a general discussion on zoos among people. These two students write their different ideas on a newspaper.
Zoos Do a Good Job------ Maria Smith
I know a large number of people think it is not wise to keep animals in zoos. ___1__ , I believe that it is good to keep animals in zoos.
Firstly, zoos are places for people to see many different kinds or animals from all over the world. ___2____zoos, most people would never see a real bear or tiger.
Secondly, zoos ___3___the animals very well. The animals are given food and cleaned regularly. In the wild (野外) , it is not always easy for an animal to find food, so sometimes it goes___4____. But animals kept in zoos never suffer from hunger.
Thirdly, zoos protect the animals they take care of. They ___5___them safe places to live in. In the wild, some kinds of animals are in danger of' becoming extinct (灭绝) . But zoos give these animals a chance to live. There would be fewer kinds of animals in the world if there were no zoos.
Zoos Are Unnatural ------Philip Black
In my opinion, zoos are not good for animals; they are only good for people.
It is not natural and    6   to keep wild animals in cages. Most animals are kept in cages that are too small for them. In the wild, these animals would travel __7__. In zoos, they can't do this. This is why the bears and tigers always look so sad.
Most cages are not very clean, either. It is true that zoos give the animals food regularly, but this is not natural. Wild animals _  8    looking for their own food. We should treat animals in the same way that we treat other people----with respect.
Would anyone be happy if you don't let him go outside his home? Would Maria like to have lots of people standing outside her flat looking at her?  No, she wouldn’t. And animals don't like it, either.

A. hungry    B. look up   C. are used to   D. fair E. However   F. without   G. look after    H. offer   I. freely

Nowadays there’s a general discussion on zoos among people. These two students write their different ideas on a newspaper.
Zoos Do a Good Job------ Maria Smith
I know a large number of people think it is not wise to keep animals in zoos. __1__, I believe that it is good to keep animals in zoos.
Firstly, zoos are places for people to see many different kinds of animals from all over the world. __2__ zoos, most people would never see a real bear or tiger.
Secondly, zoos __3__ the animals very well. The animals are given food and cleaned regularly. In the wild (野外) , it is not always easy for an animal to find food, so sometimes it goes __4__. But animals kept in zoos never suffer from hunger.
Thirdly, zoos protect the animals they take care of. They __5__ them safe places to live in. In the wild, some kinds of animals are in danger of becoming extinct (灭绝). But zoos give these animals a chance to live. There would be fewer kinds of animals in the world if there were no zoos.
Zoos Are Unnatural ------Philip Black
In my opinion, zoos are not good for animals; they are only good for people.
It is not natural and __6__ to keep wild animals in cages. Most animals are kept in cages that are too small for them. In the wild, these animals would travel __7__. In zoos, they can’t do this. This is why the bears and tigers always look so sad.
Most cages are not very clean, either. It is true that zoos give the animals food regularly, but this is not natural. Wild animals __8__ looking for their own food. We should treat animals in the same way that we treat other people----with respect.
Would anyone be happy if you don’t let him go outside his home? Would Maria like to have lots of people standing outside her flat looking at her?  No, she wouldn’t. And animals don’t like it, either.