There are deserts 沙漠 all over the worldOver half of Africa is desertThe United States has deserts in the southwest part of the countryIn some places ,deserts are growingThis is a serious problemDeserts destroy farmland and they also ruin 毀壞 land where animals liveWhen people can't grow food or find animals to eatthey have to leave their homes

    Deserts spread伸展 for different reasonsSometimes nature causes this problemWind can move sand away from deserts and onto useful landWhen there is no rain for a long time,many plants die and the land become a desertHowever human also cause deserts to growThis process過程is called "desertification",and it happens in many waysOne way is caused by a lot of air pollutionwhich makes an area hotterHotter weather can reduce the amount of rainAlso,too many people in one area can damage the landIf they have many animals,their animals can also harm the landWhen large animals like cows walk on soil too much,they turn it into dustThe wind easily blows this dust awayTrees help hold water in the groundWhen people cut down a lot of trees,the water runs away and the soil is ruinedPlants stop growing in these places

    All of these things can speed up desertification To stop deserts from growing,people must think of ways to treat the land better

1What is the main idea of the passage?

    AWhere is the world's deserts are?

    BHow people live in deserts?

    CThe different reasons for growing deserts

    DHow cows can stop deserts from growing?

2Where are deserts found?

    AAfrica and Latin America                  BThe United and China

    COn useful land                       DAcross the whole world

3Which is NOT a cause of desert growth?

    ALittle wind                            BUsing land too much

    CNo rain                             DLarge animals

4How does humans cause desert growth?

    ABy causing pollution                     B By eating only vegetables

CBy keeping animals                     DBy moving sand

5How can humans stop desert growth'?

   ABy using bicycles less                     BBy raising more cows

   CBy cutting down trees                     DBy planting more trees

1、CDACD

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There are deserts (沙漠) all over the world.Over half of Africa is desert.The United States has deserts in the southwest part of the country.In some places ,deserts are growing.This is a serious problem.Deserts destroy farmland and they also ruin (毀壞) land where animals live.When people can't grow food or find animals to eat,they have to leave their homes.

    Deserts spread(伸展) for different reasons.Sometimes nature causes this problem.Wind can move sand away from deserts and onto useful land.When there is no rain for a long time,many plants die and the land become a desert.However ,human also cause deserts to grow.This process(過程)is called "desertification",and it happens in many ways.One way is caused by a lot of air pollution,which makes an area hotter.Hotter weather can reduce the amount of rain.Also,too many people in one area can damage the land.If they have many animals,their animals can also harm the land.When large animals like cows walk on soil too much,they turn it into dust.The wind easily blows this dust away.Trees help hold water in the ground.When people cut down a lot of trees,the water runs away and the soil is ruined.Plants stop growing in these places.

    All of these things can speed up desertification. To stop deserts from growing,people must think of ways to treat the land better.

1.What is the main idea of the passage?

    A.Where is the world's deserts are?

    B.How people live in deserts?

    C.The different reasons for growing deserts.

    D.How cows can stop deserts from growing?

2.Where are deserts found?

    A.Africa and Latin America.                  B.The United and China.

    C.On useful land.                       D.Across the whole world

3.Which is NOT a cause of desert growth?

    A.Little wind.                            B.Using land too much.

    C.No rain.                             D.Large animals.

4.How does humans cause desert growth?

    A.By causing pollution.                     B By eating only vegetables.

C.By keeping animals.                     D.By moving sand.

5.How can humans stop desert growth'?

   A.By using bicycles less.                     B.By raising more cows.

   C.By cutting down trees.                     D.By planting more trees.

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