(D)
Scientists 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. People are doing bad things to the earth. 
Some places on the earth don't get 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(泥土) away.When a little bit of rain falls，the plants hold the water.Without the plants，the land can become a desert much more easily.
51.Why can the land become a desert?
A. Some places don't get much rain.
B. Plants don't let the hot sun make the earth even drier.
C. People are doing bad things to the earth.
D. Scientists haven't learnt enough about the deserts.
52. Scientists ______to make the deserts into good land again.
A. carry water  B. grow food  C. do nothing  D. study a lot
53.Which is NOT true?
A. The land never stops becoming desert.
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.
54.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 are right.
55.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 theWater.

五、词汇填空(本题有15小题，每小题1分，共计15分)
(A)阅读下面短文，然后根据括号内所给汉语意思写出单词的正确形式(每空一词)
 When I was nine years old, my family  ___56__(搬到) to a new town. ____57_ (虽然) I was new there, I still___58___  (交到) a lot of friends very soon. 
After I entered a new elementary school(小学), I got to know more friends. My classmate Tom is my best friend. Tom is an energetic(精力充沛的) boy who loves sports very much and we often play ball games ___59___ (一起). Baseball is his favorite and he is ___60___ (擅长) at baseball than me. He often beats me in baseball but never______61__  (嘲笑) at me. How I wish I could beat him some day!
When I grow up, I want to be an engineer so that I can build tall _____62_ (建筑物) . So I study really ____63___ (努力) and listen to the teacher very __64_____ (仔细地). With my great efforts, I believe my ______65_（梦想）will come true.