题目内容：

All living things on the earth need other living th ings to live on. Nothing lives alone. Most animalsmust live in a group, and even a plant grows close together with others of the same kind. Sometimes one living thing kills another, one eats and the other is eaten.①Each kind of life eats another kind of life in order to live, and together they form a food chains(子).Some food chains are simple, while others are not. But all food chains begin with the sun, ② and all food chains become broken up if one of the links(接) disappears.

All life needs sunlight to live on. But only plants can use sunlight directly. Plants are “factories”.

They make food from sunlight, water and things in the soil and air. Plants feed all other living things. Animals can only use the suns energy after it has been changed into food by plants. Some animals feed directly on plants, others eat smaller animals. Meat-eating animals are only eating plants indirectly.

What about human beings? We are members of many food chains. We eat wheat, rice, vegetables, fruits and so on. We also eat meat and drink milk. ③But men often break up the food chains. They kill wild animals and make the rivers, lakes, and seas dirty. When these rivers, lakes and seas are polluted, the fish in them cannot be eaten. If men eat the fish, they will get strange diseases(疾病).

Each form of life is linked to all the others. Breaking the links puts all life in danger.

1.根据（1）处的句子完成下面的句子。

Each kind of life eats another kind of life ________ _________ it can live.

2.将（2）处的句子翻译成中文。

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3. 根据（3）处的句子完成下面的句子。

The food chains ________ often ________up by men.