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最新版文勇的黄金阅读11.7版(WORD)

2015-04-10 11:21 三立在线 admin

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摘要:本文将最新版文勇的黄金阅读11.7版分享给大家,在这之前我们已经分享了不同的版本,如果还没有的考生抓紧时间下载哦!

  [托福阅读]最新版文勇的黄金阅读 11.7版,文勇哥的资料再次分享,三立在线的童鞋,依然不能错过啊!第一时间下载。

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  文件大小:1.45 MB (1,528,693 字节)

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  文勇的黄金阅读 11.7版部分内容:Desert Formation(节选3-5段)

  Even in the areas that retain a soil cover, the reduction of vegetation typically results in the loss of the soil's ability to absorb substantial quantities of water. The impact of raindrops on the loose soil tends to transfer fine clay particles into the tiniest soil spaces, sealing them and producing a surface that allows very little water penetration. Water absorption is greatly reduced; consequently runoff is increased, resulting in accelerated erosion rates. The gradual drying of the soil caused by its diminished ability to absorb water results in the further loss of vegetation, so that a cycle of progressive surface deterioration is established.

  In some regions, the increase in desert areas is occurring largely as the result of a trend toward drier climatic conditions. Continued gradual global warming has produced an increase in aridity for some areas over the past few thousand years. The process may be accelerated in subsequent decades if global warming resulting from air pollution seriously increases.

  There is little doubt, however, that desertification in most areas results primarily from human activities rather than natural processes. The semiarid lands bordering the deserts exist in a delicate ecological balance and are limited in their potential to adjust to increased environmental pressures. Expanding populations are subjecting the land to increasing pressures to provide them with food and fuel. In wet periods, the land may be able to respond to these stresses. During the dry periods that are common phenomena along the desert margins, though, the pressure on the land is often far in excess of its diminished capacity, and desertification results.

文勇的黄金阅读 11.7版

  以上内容就是有关文勇的黄金阅读 11.7版的部分内容介绍,用黄金阅读做题,不用专门跑到答案页面去找答案的,答案是能自动显示的咧!非常实用。

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