THE WORD ESTIMATE IN LINE 8 IS CLOSEST IN MEANING TO--- A. STUDY B...

29. The word estimate in line 8 is closest in meaning to--- A. study B. guess C. count D. catch Đọc kỹ đoạn văn và chọn phương án đúng ( ứng với A hoặc B,C,D) cho mỗi ô trống từ 30 đến 39 More than a billion people all over the world are ---(30)--- the threat of desert expansion, but few of them are ---(31)--- that they themselves cause it and are also its victims. People ---(32)--- down trees for fuel and farmland. Their herds eat up the grass –(33)--- valley floors and hillsides. The climate and soil quality, ----(34)----, are affected and forests are turned into deserts. Efforts have been ---(35)--- to solve the problem. One common method is called “ dune fixation”: if a fence is built, it “fixes” sand dunes. This fence will ----(36)--- the dune from advancing. In Algeria, people planted a green wall of trees across the edge of the Sahara to stop desert sand from ----(37)---. People in other countries around the Sahara built fences made –(38)--- brushwood or dead palm leaves for the same purpose. Obviously, the Sahara will become much larger ---(39)--- something continues to be done to solve this problem.