Three small "fish lived in the sea. When they were very young, their parents died. They had to   61   each other day after day. Finally, they grew up and   62   to swim deeper and further.

     One morning, the three fish were  63   to a shallow (浅) water by a big wave (浪). A small boat was taken there, too. It was hard for the fish to go back to the sea because the boat was fight in front of them. The largest fish realised that they were   64   , and said they had to find a way to leave there as fast as possible. The second largest fish   65   with his elder brother, but the youngest one did not. He said that there was much   66   for their activities, so he would not worry at all and still swam around   67

     At last, the largest fish returned to the   68   by jumping over the lowestpart of t-he boat. The second largest fish also succeeded in   69   his eider brother in the other side of water. But the youngest one didn't follow them and still swam joyfully.

     Two hours later, when the   70   rose up, the water in the small shallow corner dried up. The fish who did not try to return to the sea died of lack(缺乏)of water.

    1. A. listen to            B. look after           C. talk with           D. worry about

     2. A. dared              B. hated               C. refused            D. stopped

    3. A. allowed          B. given                C. invited             D. taken

    4. A. in safety           B. in doubt            C. in danger          D. in peace

5. A. agreed             B. talked              C. compared          D. discussed

6. A. time               B. food                C. water              D. air

7. A. slowly               B. sadly                C. luckily             D. happily

8. A. sea                B. river                C. lake               D. pond

9. A. catching           B. joining              C. taking             D. telling

10. A. storm              B. stars                C. moon              D. sun

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.

The world itself is becoming much smaller by using modern traffic and modern communication. Life today is much easier than it was hundreds of years ago, but it has brought new problems. One of the biggest problems is pollution.

To pollute means to make things unfit or unclean to use. Pollution comes in many ways. We see it, smell it, drink it and even eat it. Pollution is beginning to threaten (威胁) our health, our happiness and our life.

Man has been polluting the earth from the time he first made fire, washed his clothes in the river and threw his waste on the ground. When land was used up or water became dirty, men moved on to another place. At first, the problem was not so serious because there was plenty of clean air, land and water. There weren’t so many people then and their wants fewer. All the dirty things could be absorbed(吸收) by nature and soon covered over. But this is no longer true. The increase of pollution and the development of industry(工业) have changed that. Man is slowly poisoning(毒害)not only his environment but also himself.

Through the use of poison, man has polluted the land, killing the animals. By putting dirty water and chemicals into rivers and lakes we have polluted our drinking water, killing the fish.

Our increasing population is part of the problem. More people, more waste.

Where is this all to end? Are we turning the world into a big rubbish dump(堆存处)，or is there any hope that we can get rid of (摆脱，除去) the pollution? Luckily, millions of people have been warned of the danger of pollution. Large numbers of people are now working hard to bring pollution under control.

The earth is our home. We must take care of it. This means keeping the land, air and water clean. And we must take care of the rise in pollution at the same time.

1.Which of the following is NOT true according to the passage?

A. We live on the earth, so we should look after it.

B. Man is fighting against different kinds of pollution.

    C. To pollute means to make air, water and land unfit for use.

D. All the waste produced by modern industry can be absorbed.

2.In Paragraph4, the underlined word “chemicals” mean ____________.

A. 化学物质    B. 医疗器械     C. 污染源       D. 塑料制品

3.Through the uncontrolled use of poison man has___________.

    A. made the drinking water dirty        B. polluted the land

    C. killed the animals                   D. all of the above

4.From the sentences “More people, more waste.” We know that ___________

    A. we need more people, not more waste

B. the increase of population caused more waste.

    C. there isn’t any hope that we can get rid of the pollution

D. More people have been warned of the danger of more waste.

5.Which of the following is TRUE according to the passage?

A. Man begins to understand the pollution.                  

B. Man doesn’t know how to control pollution.  

C. Man is doing something to control pollution.

D. Man still doesn’t realize how serious pollution is.

We know that many animals do not stay in one place. Birds,fish and other animals move from one place  to another at a certain time. They move for different reasons: most of them move to find food more easily,but others move to get away from places that are too crowded.
When cold weather comes,many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration（迁移）is probably the migration of the fish which is called “salmon”.This fish is born in fresh water but it travels many miles to salt water.There it spends its life. When it is old,it returns to its birthplace in fresh water. Then it gives birth and dies. In northern Europe, there is a kind of mouse. They leave their mountain homes when they bccome too crowded. They move down to the low land. Sometimes they move all the way the seadide,and many of them are killed when they fall into the sea.
Recently, scientists have studied the migration of kind of lobster（龙虾）.Every year, when the season of the bad weather arrives, the lobsters get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody know where they go.
So,sometimes we know why humans and animals move from one place to another,but at other times we don’t. Maybe living things just like to travel.
【小题1】Most animals move from one place to another at a certain time to _____
A.give birth        B.enjoy warmer weather   C.find food more easily
【小题2】The fish called “salmon”spends a long time in____
A.salt water        B.rivers                 C.fresh water
【小题3】The mice in northern Europe move when_____
A.they give birth   B.the place gets too crowded
C.they haven’t enough food
【小题4】The lobsters move_______.
A.to the fresh water   B.at a certain time  C.to find more food
【小题5】What is the main idea of the passage?
A.Animals move to find food more easily.
B.The migration of the fish called“salmon”is the most famous migration.
C.Sometimes we know why and how living things move from one place to another,but sometimes we don’t.