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 deserts 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 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 (干旱的)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 deserts much more easily.
小题1:Why can the land become deserts?
A．Some places don’t 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.小题2:Scientists are to make the deserts into good land again.
A．carrying water
B．growing food
C．doing nothing
D．studying a lot小题3:Which 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.小题4:Why are green plants and grass helpful?
A．They can hold the water.
B．They can keep the earth wet.
C．They can stop the wind from blowing the earth away.
D．All the above.小题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 Deserts, the Tree and the Water
