阅读理解。
Scientists are trying to make the deserts(沙漠)into a 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 deserts all the time. Scientists may not be able to change the deserts in time.
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 deserts. 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
rain falls, the plants hold the water. Without plants, the land can become a desert much more easily.
1. What may cause the land become a desert, according to(根据) the writer?
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 a good land again.
A. carry water
B. grow food
C. do nothing
D. study a lot
3. Which of the following is NOT true?
A. The land never stops becoming deserts.
B. Scientists ask 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 of the following is the best title(标题) for the passage?
A. The Desert Problem.
B. People Make Deserts.
C. Green Plants and Grass.
D. The Desert, the Tree and the Water.