We often say that lions and tigers are kings of animals. They’re the best hunters (猎手) and they’re at the top (顶端) of the food chain (链) on land. But the best hunters in the sea are sharks. Sharks are bigger and swim ______ faster than other sea animals. They have wide mouths and sharp (锋利的) ______. They are at the top of the sea food chain.

What’s at the top of the world’s food chain? Human beings (人类)! We’re not strong, but we’re the ______. We can’t run fast, but we ______ cars; We can’t fight better, but we invented guns (枪),… Many inventions are useful to us. ______, they’re also harmful. People ask the ______ for too much. For example, we ask for food, wood, fur and so on. As a result, forests are becoming smaller and smaller. Rivers are dirty and some animals are in danger of ______ out…

Don’t forget that we’re part of the food chain. We should leave enough ______ for animals to live in. We should do something to stop people from ______ animals. We must know that protecting animals is just to protect ______.

   Plants are very important. This is because plants can make food from air, water and sunlight. Animals and man cannot make food from air, water and sunlight. Animals can get their food by eating plants and other animals. Man gets his food by eating plants and animals, too. So animals and men need plants in order to live. This is why there are so many plants around us.

There are two kinds of plants: flowering plants and non-flowering plants. Almost all the trees around us are flowering plants. You can know some trees from their flowers and fruit. Non-flowering plants do not grow flowers. You can not see many non-flowering plants around you.

If you look carefully at the plants around you, you will find that there are many kinds of plants. Some plants are large and some are small. Most of them are green. Thanks to the plants around us, we can live on the earth.

   How do animals communicate (交流) with each other? They have special “languages”. In fact, they are using signals (信号). Different signals have different meanings.

For example, when a bee (蜜蜂) finds food somewhere, it flies home quickly. It can’t speak, but it can tell others by dancing. Other bees will know where and how far the food is.

Some animals show their feelings by making sounds. For example, when a dog is angry, it barks (吠). At this time, you’d better stay away from it. Birds can make several sounds to show different meanings. Sometimes we humans show feelings by making sounds instead of by speaking. For example, when we feel painful (疼痛的), we cry“Oh!”or“Ouch!”.

We humans have languages and words. We can communicate face to face by speaking. We can write down what happened in order to remember clearly. We can also send (寄) messages to people far away. But animals can’t.

北京国际学校八年级学生魏环向福州的网友李志远发了一封电子邮件，询问了一些关于当地环境情况。请根据来信（如下）帮他回一封电子邮件。

I feel very excited about my visit to Fuzhou and meeting you for the first time! But I’m still not sure about the following questions：

1. Are there any rivers or lakes in your city?

2. Is the water dirty or clean? Why?

3. Did you do anything useful to protect the clean water?

Please let me know about it.

I am very excited to receive your e-mail. I am interested in your questions.

Looking forward to meeting you soon.

Yours，

Li Zhiyuan