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2015年6月24日 09:37 阅读 372
本周6月24日#托福TPO做做看#已经更新啦！[哈哈]小伙伴快来看看有没有遇到什么难点，疑点[吃惊]在评论区留下你们的答案及疑问吧[可爱]
6.24题目：
英文文本：
Desert Formation
The deserts, which already occupy approximately a fourth of the Earth's land surface,
have in recent decades been increasing at an alarming pace. The expansion of desertlike conditions into areas where they did not previously exist is called desertification. It has been estimated that an additional one-fourth of the Earth's land surface is threatened by this process.
Desertification is accomplished primarily through the loss of stabilizing natural
vegetation and the subsequent accelerated erosion of the soil by wind and water. In
some cases the loose soil is blown completely away, leaving a stony surface. In other
cases, the finer particles may be removed, while the sand-sized particles are
accumulated to form mobile hills or ridges of sand.
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.
Four specific activities have been identified as major contributors to the desertification
processes: overcultivation, overgrazing, firewood gathering, and overirrigation. The
cultivation of crops has expanded into progressively drier regions as population
densities have grown. These regions are especially likely to have periods of severe
dryness, so that crop failures are common. Since the raising of most crops necessitates
the prior removal of the natural vegetation, crop failures leave extensive tracts of land
devoid of a plant cover and susceptible to wind and water erosion.
题目1<词汇题>
The word {{threatened}} in the passage is closest in meaning to

选项：
A.restricted
B.endangered
C.prevented
D.rejected


c
小马托福
这周#托福TPO做做看#已经更新啦！[哈哈]小伙伴快来看看有没有遇到什么难点，疑点[吃惊]在评论区留下你们的答案及疑问吧[可爱] °托福TPO做做看 ​​​​
2015-6-24 09:38 来自 360安全浏览器
小马托福
小马托福：6月24日#托福TPO做做看# 正确选项： B.endangered 解析： threatened 受到威胁的， 选B ， endangered 有危险的， danger 名词危险， en- 表动词化的前缀， endanger 使危险，endangered 是分词形容词化。A restricted 受限制的；C prevented 被阻止的；D rejected 被拒绝的。
2015-6-25 09:35

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