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.

28. Animals are important to us mainly because __________.

A. they are beautiful and lovelyB. they keep the balance of nature

C. they give us a lot of pleasure D . they give us a source of food

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

　　A. Thousands of kinds of animals are gone forever.

　　B. A few kinds of animals have died out.

C. All kinds of animals are in danger.

D. About 170 kinds of animals have disappeared forever.

30. Why do people kill animals?

A. They kill animals to raise some money.

D. Animals destroy their natural resources.

　　C. Animals create many problems.

　　D. They kill animals for something they need.

31. What can we conclude from the fact that quite a few countries have passed laws protecting animals in danger?

A. Animals in danger will not be killed any more.

B. The number of some animals in danger will increase.

C. Every person will know the importance of protecting wild animals.

　　D. Animals in danger will be kept away from people.

　　D

How to say hello in Japanese depends on(取决于) when you say it. This is very much like different greetings(问候语) used in English at different times of the day or night. In Japanese culture, it also depends on whether you are on the phone or meeting somebody or whether you are close to the person you are greeting. We don't get formal with our close friends. We seldom greet them with "Good morning " or "Good evening". A "Hi" is enough.