All living things on the earth need other living things to live. Nothing lives alone. Most animals must 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. Each kind of life eats another kind of life in order to live, and together they form a food chain(食物链).Some food chains are simple, while others are not. But all food chains begin with the sun, and all food chains bee broken up if one of the links 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 sun’s 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. But men often break up the food chains. They kill wild animals. They also make 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.
Each form of life is linked to all others. Breaking the links puts all life in danger.
【小题1】How does every living thing on the earth live?
A. Each plant can live alone.
B. Each animal can live alone.
C. Every living thing on the earth cannot live without others.
【小题2】Which living things can use the sun’s energy directly?
A. Animals B. Plants C. All living things
【小题3】Who often break up the food chains?
A. Human beings
B. Animals
C. Plant and animals
【小题4】 Which of the following do you think is the best title of this passage?
A. Animals B. Plants C. Food Chains
【小题5】Where can you probably find this passage?
A. In a news report.
B. In your textbook.
C. In a business magazine.C
网友回答
(答案→)C
解析：
1. C 根据All living things on the earth need other living things to live 及Nothing lives alone可知任何事物都不是单独存在的，故选C。
2. B 根据第二段But only plants can use sunlight directly可知是植物，选B。
3. A 细节题考题，从But men often break up the food chains可知是人类，故选A。
4. C 归纳题。文章不单是讲动物和植物，而说是整个的生物链，A,B只是文章一个方面，故选C。
5. B 推测题。文章讲生物链，不可能来自A新闻，也不可能来自C商业杂志，故最有可能来自你的教科书，选B。