Directions：For each blank in the following passage there are four words or phrases marked A，B，C and D．Fill each blank with a word or phrase that best fits the context．

In the past, man didn’t have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be 36   .

Today things are 37  , and the world has become too  38  . We’re using up our natural resources too quickly, and at the same time we are   39   our environment with dangerous chemicals. If we continue to do this, human life on the earth will not survive.

Everyone 40   today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing 41   , more and more fish are caught. We know that if too many trees are cut down, forests will disappear and nothing will grow on the land. Yet, we   42  to use bigger and more powerful machines to cut down more and more trees.

We know that if rivers are polluted with waste products from factories, we’ll die.  43  , in most countries wastes are still put into rivers or into the sea, and there are 44   laws to stop this.

We know, too, that if the 45   of the world continues to rise at the present rate, in a few years there will not be enough food . What can we do to solve these problems? 

If we eat more vegetables and less meat there will be more food available for every one. Land that is used to grow crops   46   five times more people than land where animals are kept. Our natural resources will last longer if we learn to recycle them.

The world population will not rise so quickly if people use modern methods of birth control.

Finally, if we educate people to think about the problems, we shall have a better and cleaner 47    in the future.

A. beautiful       B. unlimited         C. rare              D. valuable

A. common       B. the same         C. changeable          D. different

A. crowded       B. small            C. dirty             D. busy

A. protecting      B. saving           C. polluting       D. fighting

A. wonders       B. realizes          C. considers          D. discovers

A. poles         B. boats            C. methods             D. ideas

A. continue       B. have              C. ought                 D. go on

A. Thus          B. However       C. Generally speaking    D. Therefore

A. too many      B. a few           C. some                  D. few

A. production     B. pollution         C. population             D. revolution

A. feeds          B. increases         C. supplies          D. helps

A. nature         B. sea           C. planet            D. forest

Directions：For each blank in the following passage there are four words or phrases marked A，B，C and D．Fill each blank with a word or phrase that best fits the context．

In the past, man didn’t have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be 36   .

Today things are 37  , and the world has become too  38  . We’re using up our natural resources too quickly, and at the same time we are   39   our environment with dangerous chemicals. If we continue to do this, human life on the earth will not survive.

Everyone 40   today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing 41   , more and more fish are caught. We know that if too many trees are cut down, forests will disappear and nothing will grow on the land. Yet, we   42  to use bigger and more powerful machines to cut down more and more trees.

We know that if rivers are polluted with waste products from factories, we’ll die.  43  , in most countries wastes are still put into rivers or into the sea, and there are 44   laws to stop this.

We know, too, that if the 45   of the world continues to rise at the present rate, in a few years there will not be enough food . What can we do to solve these problems? 

If we eat more vegetables and less meat there will be more food available for every one. Land that is used to grow crops   46   five times more people than land where animals are kept. Our natural resources will last longer if we learn to recycle them.

The world population will not rise so quickly if people use modern methods of birth control.

Finally, if we educate people to think about the problems, we shall have a better and cleaner 47    in the future.

1.A. beautiful       B. unlimited       C. rare              D. valuable

2.A. common       B. the same         C. changeable         D. different

3.A. crowded       B. small            C. dirty             D. busy

4.A. protecting      B. saving           C. polluting           D. fighting

5.A. wonders       B. realizes          C. considers          D. discovers

6.A. poles         B. boats            C. methods            D. ideas

7.A. continue       B. have             C. ought                 D. go on

8.A. Thus              B. However       C. Generally speaking    D. Therefore

9.A. too many      B. a few           C. some                 D. few

10.A. production     B. pollution           C. population             D. revolution

11.A. feeds          B. increases           C. supplies          D. helps

12.A. nature         B. sea             C. planet            D. forest

 

完形填空（共20小题；每小题1.5分，满分30分）

In the past, man didn’t have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be   1 .

Today things are  2 , and the world has become too  3  . We’re using up our natural resources too quickly, and at the same time we are   4  our environment with dangerous chemicals. If we continue to do this, human life on the earth   5 survive.

Everyone 6 today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing  7, more and more fish are caught. We know that if too many trees are cut down, 8  will disappear and nothing will grow on the land. Yet, we 9  to use bigger and more powerful machines to  10 more and more trees.

We know that if rivers are polluted with waste products from factories, we’ll die.   11 , in most countries wastes are   12 put into rivers or into the sea, and there are  13  laws to stop this.

We know, too, that if the   14  of the world continues to rise at the present rate, in a few years there will not be enough  15  . What can we do to solve these problems?

If we eat more vegetables and less  16 there will be more food available for every one. Land that is used to grow crops 17 five times more people than land where animals are kept.

Our natural resources will   18  longer if we learn to recycle them.

The world population will not rise so quickly if people use modern methods of birth 19 .

Finally, if we educate people to think about the problems, we shall have a better and cleaner   20 in the future.

1.                A．beautiful        B．unlimited        C．rare D．valuable

 

2.                A．common        B．the same        C．changeable    D．different

 

3.                A．crowded        B．small           C．dirty D．busy

 

4.                A．protecting      B．saving          C．polluting  D．fighting

 

5.                A．may not        B．will not         C．shall not  D．could not

 

6.                A．wonders        B．realizes         C．considers D．discovers

 

7.                A．poles          B．boats           C．methods  D．ideas

 

8.                A．mountains      B．seas            C．trees D．forests

 

9.                A．continue        B．have           C．ought    D．go on

 

10.               A．cut away        B．cut off          C．cut up     D．cut down

 

11.                                A．Thus   B．However

C．Generally speaking                 D．Therefore

 

12.               A．still            B．even           C．also D．certainly

 

13.               A．too many       B．a few          C．some D．few

 

14.               A．production      B．pollution        C．population     D．revolution

 

15.               A．houses         B．vegetables      C．food  D．lives

 

16.               A．fruit           B．meat           C．fish   D．grain

 

17.               A．feeds          B．increases       C．supplies   D．helps

 

18.               A．use            B．stay           C．keep D．last

 

19.               A．control         B．born           C．place D．reward

 

20.               A．star           B．sea            C．planet D．forest

 

 

       Two scientists from the United States have been traveling to countries in South America to study lightning storms. Rather than observing the lightning from the ground, scientists are watching the lightning from airplanes that fly at high altitudes(海拔) above the surface of Earth. The splendid phenomena—which have been given the imaginary names of “red sprites,” “blue jets,” and “elves”—occur high in the atmosphere above the clouds.

       During some storms a sudden flash of light will spread over the upper atmosphere with a red light that can extend as far as 60 miles above Earth. Known as a sprite, this lightning appears in the sky often in the shape of a huge carrot or jellyfish in groups of two or more. Blue jets are flashes of blue light that emanate from the top of thunderstorms and then spreading upward as much as 20 miles above Earth. These jets of light can increase in size at speeds near 60 miles per second. Elves are the most recently discovered type of high-altitude lightning. These flashes take place 40 to 60 miles above Earth and often appear just before sprites and are much brighter than sprites. Because they occur too fast to be seen with eyes, they can be detected only by instruments.

       Although scientists do not have a certain explanation for the phenomena, they are making some progress. For example, one popular theory is that the light seen from the red sprites and blue jets results from the collision(碰撞) of electrically charged tiny bits with nitrogen molecules(氮分子) in Earth’s atmosphere. The collision causes molecules to shine blue in the stratosphere, or lower altitudes. These same molecules shine red in the mesosphere, the atmosphere above the stratosphere, and they can spread to an altitude of about 50 miles. Elves seem to be caused when forceful lightning hits the ground and sends electrically charged bits into the higher altitudes.

1．What is the common characteristic of “red sprites,” “blue jets” and “elves”?

       A．They are sudden blue flashes.

       B．They can only be discovered by equipment.

       C．They are caused by the collision of atmosphere.

       D．They spread upward 20 to 60 miles above Earth.

2．The words “emanate from” underlined in paragraph 2 probably mean       .

       A．come from          B．result from          C．break away from  D．range from

3．What is the third paragraph about?

       A．A research about the Earth.                   B．The causes of the collision.

       C．An explanation for the phenomena.        D．Different theories about lightning.

4．What is the best title of this passage?

       A．A Frightening Study.                            B．Movement of the Molecules.

       C．The Changeable Atmosphere.  D．Lightning above the Clouds.

In the past, man did not have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be____36____ .

Today things are___37_____, the world has become too___38____ . We are using up our natural resources too quickly, and at the same time we are___39____ our environment with dangerous chemicals. If we continue to do this, human life on the earth ___40____survive.

Everyone___41_____ today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing__42_____ , more and more fish are caught. We know that if too many trees are cut down, ___43____will disappear and nothing will grow on the land. Yet, we ___44_____to use bigger and more powerful machines to __45____more and more trees.

We realize that if rivers are polluted with waste products from factories, we will die.___46_____, in most countries wastes are ___47______put into rivers or into the sea, and there are _48_____laws to stop this.

We know, too, that if the___49____ of the world continues to rise at the present rate, in a few years, there will not be enough___50_____. What can we do to solve these problems ?

It we eat more vegetables and less___51____, there will be more food available for everyone. Land that is used to grow crops __52_____five times more people than land where animals are kept.

Our natural resources will _53_____longer if we learn to recycle them. The world population will not rise so quickly if people use modern methods of birth__54_______ .

Finally, if we educate people to think about the problems, we shall have a better and clearer ___55____in the future.

1.                A．beautiful        B．unlimited （无限的） C．rare  D．valuable

 

2.                A．common        B．the same        C．changeable    D．different

 

3.                A．crowded        B．small           C．dirty D．busy

 

4.                A．protecting      B．saving          C．polluting  D．fighting

 

5.                A．may not        B．will not         C．shall not  D．could not

 

6.                A．wonders        B．realizes         C．consider  D．discovers

 

7.                A．poles          B．boats           C．methods  D．ideas

 

8.A mountains     B. the sea       C. trees              D. forests

9.                A．continue        B．have           C．ought    D．will go on

 

10.               A．grow          B．plant           C．save  D．cut down

 

11.               A．Thus           B．However       C．Generally speaking   D．Therefore

 

12.               A．still            B．even           C．also  D．certainly

 

13.               A．too many       B．a few          C．some D．few

 

14.               A．production      B．pollution        C．population D．revolution

 

15.               A．houses         B．vegetables      C．food  D．lives

 

16.               A．fruit           B．meat           C．fish   D．grain

 

17.               A．feeds          B．increases       C．supplies   D．helps

 

18.               A．use            B．stay           C．keep D．last

 

19.               A．control         B．born           C．plan  D．reward

 

20.               A．nature         B．sea            C．planet D．forest