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　　北京新航道学校为帮助大家雅思阅读成绩，在这提供一些雅思学习资料给大家。对于即将踏上留学征程的考生应该如何学好雅思呢?雅思阅读有没有什么技巧可循呢?其实，只要考生们将英语基础打扎实，阅读成绩并不是什么难事，看看我们下面的材料有没有对你有帮助的吧。

　　这篇雅思阅读背景主要讨论的是Dust Bowl也就是风沙中心的问题，也是美国中部大平原南部地区的代号。这个地区为什么会有这样的一个代号呢，有什么特点呢?我们一起来看看吧。

　　Dust Bowl, common name applied to a large area in the southern part of the Great Plains region of the United States, much of which suffered extensively from wind erosion during the 1930s. The area included parts of Kansas, Oklahoma, Texas, New Mexico, and Colorado. In its original state, the region was covered with hardy grasses that held the fine-grained soil in place in spite of the long recurrent droughts and occasional torrential rains characteristic of the area. A large number of homesteaders settled in the region in the 30 years before World War I, planting wheat and row crops and raising cattle. Both of these land uses left the soil exposed to the danger of erosion by the winds that constantly sweep over the gently rolling land. Beginning in the early 1930s, the region suffered a period of severe droughts, and the soil began to blow away. The organic matter, clay, and silt in the soil were carried great distances by the winds, in some cases darkening the sky as far as the Atlantic coast, and sand and heavier materials drifted against houses, fences, and barns. In many places 8 to 10 cm (3 to 4 in) of topsoil were blown away. Many thousands of families, their farms ruined, migrated westward; about a third of the remaining families had to accept government relief.

　　Beginning in 1935 intensive efforts were made by both federal and state governments to develop adequate programs for soil conservation and for rehabilitation of the Dust Bowl. The measures taken have included seeding large areas in grass; 3-year rotation of wheat and sorghum and of lying fallow; the introduction of contour plowing, terracing, and strip planting; and, in areas of greater rainfall, the planting of long “shelter belts” of trees to break the force of the wind. Dry spells in the 1950s, '60s, and late '70s were responsible for recurrences of dust storms in the region.

　　In the 1930s and 1940s, the region also received two waves of major migrations: that of farm families from the southern Great Plains migrating west to escape the Dust Bowl, and that of African Americans moving out of the American South. During World War II (1939-1945) the need for labor, especially in ship and aircraft production, boosted the population even more. The population of Los Angeles County jumped from 3 million to 4.7 million between 1940 and 1950.

　　经过老师课堂经验发现，雅思阅读对考生来说就是不能合理分配阅读题干的时间和答题时间，这还需要同学在平日里多加练习，以便应试速度，老师提醒大家，成绩绝非一朝一夕之事，勤奋练习才能收益。最后祝你考试顺利。

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