①Forests help to keep water from running away, so drought does not often happen. The trees in the forests can keep raindrops from hitting the soil directly, and the dead leaves on the ground can also keep the water from running away.②

Chinese people don’t want to see more floods and droughts. We have built the “ Great Green Wall” of trees across the northern part of our country.③ Thanks to the “ Great Green Wall”, we can prevent the wind from blowing the earth away. It will stop the sand from moving towards the rich farmland. That’s why more “ Great Green Walls” are needed. Trees must be planted all over the world.④

根据短文内容，从题中所给的A、B、C、D四个选项中，选择最佳答案。（10分）

1. “Great Green Wall will make the world better.” This sentence should be put in      .

2.       can help to keep water from running away.

3. The reason of building “ Great Green Wall”is        .

4. We have built the “ Great Green Wall” of trees        of China.

5.From the passage, we can know which is wrong.

Forests have always been important to people. We make use of them in many   46  . First, trees   47   man fruits and building materials in the form of wood. Without trees it would be   __48   to build houses, boats, bridges and so on. Furniture such as desks, chairs and beds are made of   49  . Second, trees can  50   man from terrible heat. They provide shade for us. Third, they are also useful in stopping rich top soil from being washed away by heavy rains. The top soil is   51   for plants.

Unfortunately, because people in the past did not know enough about the science of nature, they   52    down too many trees and never planted new ones. Gradually the   53   of trees became smaller and smaller. And the rich surface soil was blown and washed away by strong wind and heavy rain. In the end the rich lands    54   into useless deserts.   55__  could grow there any more.

(   )46. A. ideas                B. ways                 C. parts               D. countries

(   )47. A. give                 B. show                C. make              D. bring

(   )48. A. different             B. impossible      C. interesting         D. easy

(   )49. A. plastic                      B. glass                 C. rubber             D. wood

(   )50. A. separate             B. stop            C. protect         D. save

(   )51. A. bad                  B. dangerous       C. important        D. special

(   )52. A. wrote               B. cut                    C. broke              D. pulled

(   )53. A. number                     B. height           C. weight            D. quality

(   )54. A. flowed               B. ran                    C. changed            D. fell

(   )55. A. Everything          B. Something     C. Anything           D. Nothing

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 （毁坏） 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（过程）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．