All living things on the earth need other living things to live with. Nothing lives  1 . Sometimes one living thing kills    2  . Each kind of life eats another kind of life     3   live, and together they form a food chain(食物链). Some food chains are simple, while others are not. But    4    food chains begin with the sun, and all food chains become    5   if one of the links disappears.
All life needs sunlight to live on. But only plants can use    6   directly(直接地). They make food from sunlight, water, air and so on. Animals can only use the sun’s energy    7    it has been changed into food by plants. Some animals feed directly on plants. Others eat smaller animals. Meat-eating animals are only   8 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   9     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    10   be eaten. If people eat the fish, they will get strange diseases.
Each form of life is linked to all the others. Breaking the links puts all life in danger.

All living things on the earth need other living things to live with. Nothing lives  1 . Sometimes one living thing kills    2  . Each kind of life eats another kind of life     3   live, and together they form a food chain(食物链). Some food chains are simple, while others are not. But    4    food chains begin with the sun, and all food chains become    5   if one of the links disappears.

All life needs sunlight to live on. But only plants can use    6   directly(直接地). They make food from sunlight, water, air and so on. Animals can only use the sun’s energy    7    it has been changed into food by plants. Some animals feed directly on plants. Others eat smaller animals. Meat-eating animals are only   8 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   9     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    10   be eaten. If people eat the fish, they will get strange diseases.

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

1.                A．alone          B．lonely          C．together  D．happily

2.                A．other          B．the other       C．another  D．the others

3.                A．for            B．so that          C．and  D．in order to

4.                A．any            B．all             C．some D．most

5.                A．better          B．broken         C．stronger  D．nicer

6.                A．moonlight       B．laser light       C．sunlight   D．bright light

7.                A．after           B．before         C．until D．by the time

8.                A．making         B．catching        C．eating    D．feeding

9.                A．sunlight        B．animals         C．plants    D．people

10.               A．can            B．cannot         C．must  D．needn’t

All living things on the earth need other living things to live with. Nothing lives  46  . Sometimes one living thing kills    47   . Each kind of life eats another kind of life     48    live, and together they form a food chain(食物链). Some food chains are simple, while others are not. But    49     food chains begin with the sun, and all food chains become    50    if one of the links disappears.

All life needs sunlight to live on. But only plants can use    51    directly(直接地). They make food from sunlight, water, air and so on. Animals can only use the sun’s energy    52     it has been changed into food by plants. Some animals feed directly on plants. Others eat smaller animals. Meat-eating animals are only   53 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    54     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     55    be eaten. If people eat the fish, they will get strange diseases.

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

(   ) 46. A. alone         B. lonely         C. together         D. happily

(   ) 47. A. other         B. the other       C. another          D. the others

(   ) 48. A. for           B. so that         C. and             D. in order to

(   ) 49. A. any          B. all            C. some           D. most

(   ) 50. A. better        B. broken         C. stronger         D. nicer

(   ) 51. A. moonlight    B. laser light       C. sunlight         D. bright light

(   ) 52. A. after         B. before         C. until           D. by the time

(   ) 53. A. making       B. catching       C. eating          D. feeding

(   ) 54. A. sunlight      B. animals        C. plants          D. people

(   ) 55. A. can          B. cannot         C. must          D. needn’t

All living things on the earth need other living things to live on. 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 __①__    is eaten. Each kind of life eats another kind of life in order to live, and together they form a food chains(链子). 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(连接) disappears.

All life needs sunlight to live on. But only plants can use sunlight directly (直接地). 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(间接地).

What about human beings（人类）? 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 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 (形式, 方式) of life is linked to all the others. Breaking the links puts all life in danger.

71、在①句的空白处填入适当的词使句意完整、上下文通顺。______________

72、将②句译成中文。                                                  

73、What do plants make food from?

74、在文中找出与下面意思相近的句子并写在下列的横线上。

Human beings often break the balance of nature.

75、找出文中或写出最能表达该短文主题的句子。