任务型阅读。阅读短文，并根据短文内容回答问题。

　　Why is more and more land becoming deserts?

　　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 there. They are

learning a lot about the deserts. But more and more of the earth are 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. (1)Some places on the earth do not get very much rain. But they still do

not become deserts. This is because some green plants are growing there. Small

green plants and grass are very important to dry places. Plants do not let the hot

sun make the earth even drier. Plants do not let the wind blow the soil away.

(2)When a little bit of rain falls, the plants hold the water. Without plants, the

land can become a desert much more easily.

根据短文内容，把划线部分译成汉语。

1.                                                                            

2.                                                                            

根据短文内容，回答下列问题。

3. Does the writer think scientists can turn the deserts into land? Why?

4. Why is more and more land becoming deserts while scientists are trying to

make the deserts into good land?

5. Why are small green plants and grass important to dry places?