阅读理解(56)

　　Desert

　　一、 填空篇

　　Scientists are____ to make the desert into good land again. They want to____ water to the desert, so people can live and____ food. They are learning a____ about deserts. But more and more of the earth is becoming desert___ the time. Scientists may not be able to change the deserts in_____.

　　Why is more and more land becoming desert? Scientists think that people make deserts. People are doing ____things to the earth. Some places on the earth don’t get____ 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____ places. Plants keep the hot sun____ making the earth even drier. Plants don’t let the winds____ the dirt away. When a little bit of rain____, the plants hold the water. Without plants, land can become desert much more easily.

　　根据短文内容，填写所缺单词：

　　1. t ______2. b ______3.g ______4. l ______5.a ______6. t ______

　　7. b______8. m______9. d______10. f______11. b______ 12. f ______

　　(答案：1.trying 2.bring 3.grow 4.lot 5.all 6.time 7.bad 8.much 9.dry 10.from 11.blow 12.falls)