Water can be a liquid, a solid or a gas. When it is a solid, it can be as hard as stone. When it is a liquid, it can run through your fingers. When it is a gas, you may not see or feel it.

Water can change from a solid to a liquid or to a gas easily. This is why we always have fresh water. Now let us find out how it does. The heat of the sun turns liquid water into gas from the oceans, seas, rivers and lakes. The heat also turns liquid water into gas from the ground, the plants and the animals. Water in the gas rises and turns into clouds in the air.

When the clouds come near a mountain, they rise high. As the clouds rise, they get cooler. The higher they rise, the cooler they become. Then more and more water gas turn into water drops. In this way, the drops of water in the clouds get bigger and bigger. Then they fall to the earth as rain.

根据短文内容，选择正确答案

1.What is the solid of water?

A．Rain             B．Gas              C．Stone            D．Ice

2.When the water is a _____, we may not see or feel it.

A．liquid            B．soild             C．gas              D．snow

3.The water in the oceans turns into clouds because _____ 

A．the wind                              B．the heat of the sun

C．the mountain                          D．the earth

4.According to the passage, it rains most over the_____     

A．seas             B．oceans            C．mountains         D．farms

5.The higher you go up the mountain, _____you will feel.

A．the cooler         B．the hotter         C．the heavier        D．the bigger

 

The earth is our home；we must take Care of it. This means keeping the land，air and water   clean.
Pollution is a dirty word. To pollute means to make things unfit(不合适的)or unclean to use. Pollution comes in many ways. We see it，smell it，taste it and drink it. Pollution is beginning to threaten(威胁)our health，or 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 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(需求)were fewer. All the dirty things could be absorbed(吸收)by nature and soon. covered over(恢复)， But this is no longer true. The increase of population(人口增长)and the development of industry have changed that. Man is slowly polluting. his environment.
Through the use of poison(农药)，mall has polluted land! killing the animal. 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，or is there any hope that we can get rid of(摆脱)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
【小题1】Which sentence is WRONG?

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

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

C．All the waste produced by modem industry can be absorbed.

D．Man is now fighting against different kinds of pollution.

【小题2】In this passage the word "chemicals" means

A．化学

B．化学物质

C．化学的

D．医学的

【小题3】 From the sentences "More people more waste"，we know that _______.

A．because of the increase of population and the development of industry，more and more waste is produced

B．we need more people，not 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.

【小题4】From the passage we can know that now man_______.

A．doesn't know how to control pollution

B．still doesn't realize how serious pollution is

C．is doing something to control pollution

D．begins to understand the pollution

The earth is our home；we must take Care of it. This means keeping the land，air and water   clean.
Pollution is a dirty word. To pollute means to make things unfit(不合适的)or unclean to use. Pollution comes in many ways. We see it，smell it，taste it and drink it. Pollution is beginning to threaten(威胁)our health，or 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 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(需求)were fewer. All the dirty things could be absorbed(吸收)by nature and soon. covered over(恢复)， But this is no longer true. The increase of population(人口增长)and the development of industry have changed that. Man is slowly polluting. his environment.
Through the use of poison(农药)，mall has polluted land! killing the animal. 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，or is there any hope that we can get rid of(摆脱)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
【小题1】Which sentence is WRONG?

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

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

C．All the waste produced by modem industry can be absorbed.

D．Man is now fighting against different kinds of pollution.

【小题2】In this passage the word "chemicals" means

A．化学

B．化学物质

C．化学的

D．医学的

【小题3】 From the sentences "More people more waste"，we know that _______.

A．because of the increase of population and the development of industry，more and more waste is produced

B．we need more people，not 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.

【小题4】From the passage we can know that now man_______.

A．doesn’t know how to control pollution

B．still doesn’t realize how serious pollution is

C．is doing something to control pollution

D．begins to understand the pollution

The earth is our home and we must take good care of it. That is to say we must   1   the land, air and water clean. But man    2  a lot of pollution on earth since he first made fire, washed his clothes in the river and threw rubbish on the ground. Many years ago, pollution was not so serious   3    there were not so many people.

There were enough    4   air, land and water. When the land or the river was dirty in one place, man moved to    5   place. Man is    6   the whole world now. So there is   7    enough clean air, nor clean land, nor clean water now. The more people there are in one place,    8    environment they maybe have.

Perhaps you are afraid     9   is endless(无休止的) for people to produce pollution.

    10  , we are glad to tell you that people have come to know the danger of pollution. And you can find more and more people are working hard to protect our earth.

1.                A．have           B．take           C．watch    D．keep

 

2.                A．produced       B．has produced    C．is producing   D．will produce

 

3.                A．so             B．if              C．because  D．but

 

4.                A．clean          B．old            C．dirty D．new

 

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

 

6.                A．pollute         B．polluting        C．clearing  D．clear

 

7.                A．neither         B．both           C．either    D．none

 

8.                A．the worst       B．the worse       C．the bad   D．worse

 

9.                A．that           B．this            C．what     D．it

 

10.               A．Quickly         B．Especially       C．Luckily    D．Anyway

 

 

The earth is our home；we must take Care of it. This means keeping the land，air and water   clean.

    Pollution is a dirty word. To pollute means to make things unfit(不合适的)or unclean to use. Pollution comes in many ways. We see it，smell it，taste it and drink it. Pollution is beginning to threaten(威胁)our health，or 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 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(需求)were fewer. All the dirty things could be absorbed(吸收)by nature and soon. covered over(恢复)， But this is no longer true. The increase of population(人口增长)and the development of industry have changed that. Man is slowly polluting. his environment.

Through the use of poison(农药)，mall has polluted land! killing the animal. 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，or is there any hope that we can get rid of(摆脱)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

1.Which sentence is WRONG?

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

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

       C. All the waste produced by modem industry can be absorbed.

       D. Man is now fighting against different kinds of pollution.

2.In this passage the word "chemicals" means

       A.化学         B.化学物质        C.化学的        D.医学的

3. From the sentences "More people more waste"，we know that _______.

       A. because of the increase of population and the development of industry，more and more waste is produced

       B. we need more people，not 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.

4.From the passage we can know that now man_______.

       A. doesn't know how to control pollution

       B. still doesn't realize how serious pollution is

       C. is doing something to control pollution

       D. begins to understand the pollution