For example, when farmers killed large numbers of hawks(鹰), the farmers’ stores of corn and grain were destroyed by rats and mice. Why? Because hawks eat rats and mice. With no hawks to keep down their numbers, the rats and mice multiplied(繁殖) quickly.

　　Luckily, some people are working to help save the animals. Some groups raise money to let people know about the problem. And they try to get the governments to pass laws protecting animals in danger.

　　Quite a few countries have passed laws. These laws forbid(禁止) the killing of any animal or plant on the danger list. Slowly, the number of some animals in danger is growing.

　　56. Animals are important to us mainly because __________.

　　A . they give us a source of food

　　B. they are beautiful and lovely

　　C. they keep the balance of nature

　　D. they give us a lot of pleasure

　　57. What has happened to the animals on the earth?

　　A. About 170 kinds of animals have disappeared forever.

　　B. Thousands of kinds of animals are gone forever.

　　C. A few kinds of animals have died out.

　　D. All kinds of animals are in danger.

　　58. Why do people kill animals?

　　A. They kill animals for something they need.

　　B. They kill animals to raise some money.

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