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 sun make the earth even drier. Plants do not let the wind blow the dirt away. When a bit of rain falls，the plants hold the water. Without plants，the land can become desert more easily.

1.Deserts ＿＿＿＿＿＿＿＿ .

2.Small green plants are very important to dry places because ＿＿＿＿＿＿.

3.Land is becoming desert little by little because ＿＿＿＿＿＿.

4.After reading this passage， we learn that ＿＿＿＿＿＿＿＿.

Scientists are trying to make the deserts ,which get very little rain, 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 against the scientists’ wish．

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 sun make the earth even drier． Plants do not let the wind blow the dirt away．When a bit of rain falls，the plants hold the water. Without plants, the land can become desert more easily．

1.Deserts ____________ ．

2.More and more land is becoming desert  because____________．

3.Small green plants are very important to dry places because ________

4.After reading this passage, we learn that _____________ ．

Scientists are trying to make the deserts ,which get very little rain, 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 against the scientists’ wish.
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 sun make the earth even drier. Plants do not let the wind blow the dirt away.When a bit of rain falls，the plants hold the water. Without plants, the land can become desert more easily.

1. 1.

   Deserts ____________ .

   1. A.
      never have any plants or animals in them
   2. B.
      can all be turned into good land before long
   3. C.
      are becoming smaller and smaller
   4. D.
      get very little rain
2. 2.

   More and more land is becoming desert  because____________.

   1. A.
      plants can’t grow there
   2. B.
      there is not enough rain
   3. C.
      people haven’t done what scientists wish them to do
   4. D.
      scientists know little about the deserts
3. 3.

   Small green plants are very important to dry places because ________

   1. A.
      they don’t let the sun make the earth even drier
   2. B.
      they don’t let the wind blow the soil away
   3. C.
      they hold water
   4. D.
      All of the above.
4. 4.

   After reading this passage, we learn that _____________ .

   1. A.
      plants can keep dry land from becoming desert
   2. B.
      it is good to get rid of the grass in the deserts
   3. C.
      all places without much rain will become deserts
   4. D.
      it is better to grow crops on dry land than to cut them

    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 sun make the earth even drier． Plants do not let the wind blow the dirt away． When a bit of rain falls， the plants hold the water． Without plants， the land can become desert more easily．

1． Deserts ＿＿＿＿＿＿＿＿ ．

     A． never have any plants or animals in them

     B． can all be turned into good land before long

     C． are becoming smaller and smaller

     D． get very little rain

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 soil 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． After reading this passage， we 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 on dry land than to cut them

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．

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 sun make the earth even drier．Plants do not let the wind blow the dirt away. When a bit of rain falls，the plants hold the water. Without plants, the land can become desert more easily．

56. Deserts　　 ______．

A. never have any plants or animals in them

B. can all be turned into good land before long

C. are becoming smaller and smaller　　 D. get very little water

57. 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 soil away.

　　 C．they hold water　　　　 D．All of the above．

58. 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

59. After reading this passage，we 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．a(chǎn)ll places without much rain will become deserts

　　 D．it is better to grow crops on dry land than to cut them