五、阅读理解。〔人与自然——环境保护〕
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. 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. Why can the land become deserts?
A. Some places get 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 want to to make the deserts into good land again.
A. carry water
B. grow food
C. do nothing
D. study
3. 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.
4. Which is the best title for the passage?
A. The desert problem
B. Climate makes deserts
C. Green plants and grass
D. Deserts, trees and water

1. C 2. A 3. D 4. A