Đề thi đọc hiểu anh 12 số 1 Desertification The Sahara desert is growing by 10 km each year. The whole earth gets 600 km2 of desert area more every year. This process is called “Desertification”. This term started being (1) … in the 1950s. The idea of desertification was first known in the 1930s. Much of the Great Plains grew very dry (2) … a result of drought and very poor farming techniques. It was called the “Dust Bowl”. Millions were forced to leave their farms and their ways of life. Since then, (3) … have been great improvements in farming practices in the Great Plains. These have prevented the “Dust Bowl” disaster (4) … again. Grazing is one worry. Cows do two things to the soil. First, they eat grasses and plants that hold the soil in place. Second, their hooves break down the top layer of soil. The result is that the good soil can be blown away by the wind. The dirt (5) … behind is not good for growing. 1. A. use B. used C. to use D. using 2. A. as B. for C. by D. with 3. A. it B. they C. there D. those 4. A. to occur B. to occurring C. of occurring D. from occurring 5. A. leaves B. to leave C. left D. leaving KEY: 1. B 2. A 3. C 4. D 5. C . Đề thi đọc hiểu anh 12 số 1 Desertification The Sahara desert is growing by 10 km each year. The whole earth gets 600 km2 of desert area more every year. This process is called. year. This process is called “Desertification”. This term started being (1) … in the 19 50s. The idea of desertification was first known in the 19 30s. Much of the Great Plains grew very dry (2). Plains. These have prevented the “Dust Bowl” disaster (4) … again. Grazing is one worry. Cows do two things to the soil. First, they eat grasses and plants that hold the soil in place. Second, their hooves