完形填空先通读短文，掌握其大意，然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳*，将其标号填...

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完形填空

先通读短文，掌握其大意，然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳*，将其标号填入题前括号内。

All living things on the earth need other living things to live. Nothing lives 1 . 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. 2 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 3 the sun, and all food chains become broken up if one of the links disappears.

All life needs sunlight 4 . But only plants can use sunlight directly. Plants are “factories”. They made food from sunlight, water and things in the soil and 5 .

Plants feed all other living things. Animals can only use the sun’s energy（能量）after it has been changed into food by plants. Some animals feed directly on plants, 6 eat smaller animals. Meat-eating animals only eat plants indirectly.

What about human beings? We are members of 7 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 8 rivers, lakes and seas dirty. When these rivers, lakes and seas are polluted, the fish in them can not be eaten. If men eat 9 , they will get strange diseases.

Each form of life is linked to all others. Breaking the links put all life in 10 .

（）1. A. lonely B. alone C. lively D. lovely

（）2. A. Each kind B. Every C. Everyone D. Each other

（）3. A. at B. in C. with D. on

（）4. A. to live B. to live on C. lives D. lives on

（）5. A. milk B. water C. sun D. air

（）6. A. others B. other C. the other D. the others

（）7. A. much B. a lot C. many D. lot of

（）8. A. keep B. let C. have D. make

（）9. A. water B. the fish C. milk D. plants

（）10. A. dangerous B. danger

C. more dangerous D. most dangerous