阅读理解。

     Scientists(科学家) 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 . 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 desert . 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 learnt 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 (题目) for the passage ?

A. The Desert Problem

B. People Make Deserts

C. Green Plants and Grass

D. The Desert , the Tree and the Water