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    A Scientists are trying to make the deserts into good land again. They want to bring water to the deserts. So people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is becoming desert all the time. Scientists may not be able to change the desert in time. Why is more and more land becoming desert? Scientists think that people make deserts. People are doing bad things to the earth. Some places on the earth don’t get very much rain. But they still don’t become deserts. This is because some green plants are growing there. Small green plants and grass are very important to dry places. Plants don’t let the hot sun make the earth ever drier. Plants don’t let he wind blow the dirt away. When a little bit of rain falls, the plants hold the water. Without plants, the land can become a desert much more easily. 1. Deserts . a. get very little rain b. never have any plants or animals in them c. call all be turned into good land before long d. both a and c 2. Small green plants are very important to dry places because . a. they don’t let the sun make the earth ever drier b. they don’t let the wind blow the earth away c. they hold water d. all of the above 3. Land is becoming desert little by little because . a. plants can’t grow there b. there is not enough rain c. people haven’t done what scientists wish them to do d. scientists know little about the deserts 4. Which is the main idea of the first paragraph? . a. Scientists know how to change desert into good land b. Land is becoming desert faster than scientists can change it back into good land c. If scientists can bring water to desert, people can live and grow food there d. More and more places are becoming deserts all the time 5. After telling this, we learn that . a. plants can keep dry land from becoming deserts b. it is good to get rid of grass into the deserts c. all places without much rain will become deserts d. it is better to grow crops on dry land than to grow grass 【查看更多】

     

    题目列表(包括答案和解析)

    Green Plants and Deserts

    　　Scientists are trying to make the deserts into good land again. They want to bring water to the deserts, so people can live and grow crops. They are learning a lot about the deserts. But more and more land of the earth is becoming deserts all the time. Scientists may not be able to change the deserts in a short time.

    　　Why is more and more land becoming deserts? Scientists think it is the people who make more and more deserts. People do bad things to the earth.

    　　There is little rain in some places of the world. But these places don't become deserts because some green plants are growing there. Green plants are important to dry places. Plants prevent the hot sun from making the earth even drier. Plants don't let the wind blow the dirt away. When rain falls, the plants hold the water. Without the plants, the land will become deserts much more easily.

    (1)There is _______ in the deserts.

    [　　]

    A．little sunlight

    B．little rain

    C．too many plants

    D．so strong wind

    (2)More and more land is becoming deserts because _______.

    [　　]

    A．people have done bad things to it

    B．it has rained too much

    C．there are no people living there

    D．there is not enough sunshine

    (3)Scientists think that _______, crops can be planted there.

    [　　]

    A．if there is enough water in the deserts

    B．as soon as farmers go to the deserts

    C．if there is a big city near the deserts

    D．if the weather is good

    (4)The green plants can _________.

    [　　]

    A．bring water into deserts

    B．hold water and stop the land becoming too dry

    C．make land into deserts

    D．provide water for deserts

    (5)If there are no plants in a place, _________.

    [　　]

    A．there is no rain there

    B．the land will become deserts soon

    C．people won't have enough food to eat

    D．the weather will be bad

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    阅读理解

    　　Scientists are trying to make the deserts into good land again. They want to bring water to the deserts, so people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is becoming desert all the time. Scientist may not be able to change the deserts. Scientists think that people make deserts. People are doing bad things to the earth.

    　　Some places on the earth don't get very much rain. But they still don't become deserts. This is because some green plants are growing there. Small green plants and grass are very helpful to dry places. Plants don't let the hot sun make the earth even drier. Plants don't let the wind blow the earth away. When a little bit of rain falls, the plants hold the water. Without plants, the land can become a desert much more easily.

    1．Why can the land become a desert?

    [　　]

    A．Some places don't get very much rain.

    B．Plants don't let the hot sun make the earth even drier.

    C．People don't keep the earth well.

    D．Scientists haven't learned enough about the deserts.

    2.Scientists ________ to make the deserts into good land again.

    [　　]

    A．carry water
    B．grow food
    C．do nothing
    D．study a lot

    3．Which is not true?

    [　　]

    A．The land never stops becoming deserts.

    B．Scientists ask the people to live in the deserts and grow food there.

    C．People do bad things to the earth.

    D．Scientists may not be able to change the deserts.

    4．Why are green plants and grass helpful?

    [　　]

    A．They can hold the water.

    B．They can stop the wind from blowing the earth away.

    C．They can keep the earth wet.

    D．All the above.

    5．Which is the best title for the passage?

    [　　]

    A．The Desert Problem.

    B．People Make Deserts.

    C．Green Plants and Grass.

    D．The Desert, the Tree and the Water.

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    完形填空。
         Scientists are trying to make the desert into good land again. They want to bring    1     to the desert,  
    so people can live and grow food.  They are    2    a lot about the desert. But    3    of the earth is
    becoming desert all the time, scientists may not be able to    4    . the deserts. Scientists think that
    people make deserts.  People are doing    5    things to the earth. 
         Some places on the earth don't get    6   .  But they still don't become deserts. This is _7  _ some
    green plants are growing there.  Small green plants and grass are very    8    to dry places. Plants don't
    let the wind blow the earth away. When   9  _ bit of rain falls,  the plants hold the water.   10   plants,  
    the land can become a desert much more easily.
    (     )1. A. food            
    (     )2. A. learning        
    (     )3. A. fewer and fewer  
    (     )4. A. use              
    (     )5. A. good            
    (     )6. A. little rain      
    (     )7. A. because          
    (     )8. A. careful          
    (     )9. A. a little        
    (     )10. A. With                		 B. water        
    B. writing      
    B. less and less
    B. change      
    B. better      
    B. much warm    
    B. for          
    B. helpful      
    B. a few        
    B. Without          		 C. money          
    C. buying        
    C. more and more
    C. lose          
    C. bad            
    C. much rain      
    C. as            
    C. forgetful      
    C. a lot        
    C. For            

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    Scientists are trying to make the deserts（沙漠）into good land again. They want to bring water to the deserts, so people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is becoming desert all the time. Scientists may not be able to change the deserts. People are bad things to the earth.

    Some places on the earth don’t get much rain. But they still become deserts. This is because some green plants are growing there. Small green plants and grass are very important to dry places. Plants don’t let the wind blow the soil（土壤）away. When a bit of rain falls, the plants hold the water. Without plants, the land can become a desert much more easily.

    (     ) 1. Deserts________

    A.      get very little rain

    B.      never have any plants or animals in them

    C.      can all be turned into good land before long

    D.     both A and C

    (    ) 2. Small green plants are very important to dry places because______

    A.      they don’t let the sun make the earth even drier

    B.      they don’t let the wind blow the earth away

    C.      they hold water

    D.     all of the above

    (    ) 3. Land is becoming desert little by little because________

    A.      plants can’t grow there

    B.      there is not enough rain

    C.      people haven’t done what scientists wish them to do

    D.     scientists know little about the deserts

    (    ) 4. Which is the main（主要的）idea of the first paragraph?

    A.      Scientists know how to change desert into good land

    B.      Land is becoming desert faster than scientists can change it back into good land

    C.      If scientists can bring water to desert, people can live and grow food there

    D.     More and more places are becoming deserts all the time

    (    ) 5. After reading this, we can learn that _______

    A.      plants can keep dry land from becoming desert

    B.      it is good to get rid of the grass in the deserts

    C.      all places without much rain will become deserts

    D.     it is better to grow crops（谷物）dry land than to grow grass

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    阅读理解：

    　　Scientists are trying to make the deserts()into good land again．They want to bring water to the deserts, so people can live and grow food．They are learning a lot about the deserts．But more and more of the earth is becoming desert all the time．Scientists may not be able to change the desert in time．

    　　Why is more and more land becoming desert? Scientists think that people make deserts．People are doing bad things to the earth．

    　　Some places on the earth don’t get much rain．But they still don’t become deserts．This is because some green plants are growing there．Small green plants and grass are very important to dry places．Plants don’t let the hot sun make the earth even drier．Plants don’t let the wind blow the dirt away．When a little bit of rain falls, the plants hold the water．Without plants, the land can become a desert much more easily．

    (1)

    Deserts ________．

    [　　]

    A．

    get very little rain

    B．

    never have any plants or animals in them

    C．

    can all be turned into good land in the future

    D．

    both A and C

    (2)

    Small green plants are very important to day places because ________．

    [　　]

    A．

    they don’t let the sun make the earth even drier

    B．

    they don’t let the wind blow the earth away

    C．

    they hold the water

    D．

    A, B and C

    (3)

    Land is becoming desert little by little because ________．

    [　　]

    A．

    plants can’t grow there

    B．

    there’s not enough rain

    C．

    people are doing bad things to the earth．

    D．

    scientists know little about desert

    (4)

    Which is the main idea of the first paragraph?

    [　　]

    A．

    Scientists know how to change land into good land．

    B．

    Land is becoming desert faster than scientists can change it back into good land．

    C．

    If scientists can bring water to the desert, people can live there．

    D．

    More and more places are becoming deserts all the time．

    (5)

    After reading this, we learn that ________．

    [　　]

    A．

    plant can keep dry land from becoming desert．

    B．

    it is good to get rid of(清除)the grass in the desert

    C．

    all places without much rain will become deserts

    D．

    it is better to grow crops on dry land than to grow grass

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