Deserts(沙漠)do not stay the same size (形狀).Sometimes they grow bigger. Sometimes they get smaller. The world’s biggest desert, Sahara, is in Africa. Right now, the Sahara desert is growing fast.

Why is the Sahara growing ? In some places , People farm too much.  In other places ,animals eat all the grass. or people cut down the trees. This makes the soil(土壤) weak. Weak soil lets the desert grow.

Why is it a problem? people can not grow food in the desert. people can not build houses, hospitals , or schools in the desert . so people must leave their homes .They must live somewhere else.

What can people do ? They can plant trees. They can also farm less. These things make soil stronger. maybe the Sahara will stop growing . It’s a big problem. Many people must work together to solve (解決) it?

1.What is the main idea ?(中心思想)

A．The Sahara Desert is in Africa .

B．Farming too much makes the soil weak.

C．Big problem are caused (引起) by the growing Sahara desert.

D．Planting trees will help the world.

2.The Sahara is growing .Which of these things is not a reason(理由)？

A．Building homes

B．Farming too much

C．Animals eating the grass

D．Cutting down trees

3.What do we know about deserts ?

A．Their size never changes

B．They are caused by people

C．They can make trouble for people

D．They are all in Africa.

4.Planting trees can   

A．make the soil weaker

B．help people farm less

C．be good for the soil

D．make the Sahara grow.

5.Stopping growing the desert

A．is easy

B．takes a lot of people

C．is not a big problem

D．is not important

 

【答案】

1.D

2.A

3.C

4.C

5.B    

【解析】

1.根據(jù)文章內(nèi)容大意可知答案為D

2.根據(jù)文章內(nèi)容Why is the Sahara growing ? In some places, People farm too much.  In other places, animals eat all the grass. or people cut down the trees. This makes the soil(土壤) weak. Weak soil lets the desert grow.可知答案為A

3.根據(jù)文章內(nèi)容. so people must leave their homes .They must live somewhere else.可知答案為C

4.根據(jù)文章內(nèi)容What can people do ? They can plant trees. They can also farm less. These things make soil stronger.可知答案為C

5.根據(jù)文章內(nèi)容It’s a big problem. Many people must work together to solve (解決) it?可知答案為B

 

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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 desert in time．

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　　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 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)

Deserts________．

[　　]

A．

get very little rain

B．

never have any plants or animals in them

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can all be turned into good land in the future

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[　　]

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[　　]

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Scientists know how to change land into good land．

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

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More and more places are becoming deserts all the time．

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After reading this, we learn that ________．

[　　]

A．

plant can keep dry land from becoming desert．

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all places without much rain will become deserts

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Deserts(沙漠)do not stay the same size (形狀).Sometimes they grow bigger. Sometimes they get smaller. The world’s biggest desert, Sahara, is in Africa. Right now, the Sahara desert is growing fast.
Why is the Sahara growing ? In some places , People farm too much.  In other places ,animals eat all the grass. or people cut down the trees. This makes the soil(土壤) weak. Weak soil lets the desert grow.
Why is it a problem? people can not grow food in the desert. people can not build houses, hospitals , or schools in the desert . so people must leave their homes .They must live somewhere else.
What can people do ? They can plant trees. They can also farm less. These things make soil stronger. maybe the Sahara will stop growing . It’s a big problem. Many people must work together to solve (解決) it?
【小題1】What is the main idea ?(中心思想)

A．The Sahara Desert is in Africa .
B．Farming too much makes the soil weak.
C．Big problem are caused (引起) by the growing Sahara desert.
D．Planting trees will help the world.
【小題2】The Sahara is growing .Which of these things is not a reason(理由)？
A．Building homesB．Farming too much
C．Animals eating the grassD．Cutting down trees
【小題3】What do we know about deserts ?
A．Their size never changesB．They are caused by people
C．They can make trouble for peopleD．They are all in Africa.
【小題4】Planting trees can   
A．make the soil weakerB．help people farm less
C．be good for the soilD．make the Sahara grow.
【小題5】Stopping growing the desert
A．is easyB．takes a lot of people
C．is not a big problemD．is not important

查看答案和解析>>

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