2021年8月29日雅思阅读机经

更新：2022年01月21日 23:48 雅思无忧

雅思考试主要是通过对考生听、说、读、写四个方面英语能力的考核，综合测评考生的英语沟通运用能力，实现“沟通为本”的考试理念。对于雅思考生来说，也有很多考试难点和政策盲区需要帮助解答。今天雅思无忧网小编准备了文章2021年8月29日雅思阅读机经，希望通过文章来解决雅思考生这方面的疑难问题，敬请关注。

2021年8月29日雅思考笔已经结束，教研中心为大带来的 2021 年 8 月 29 日，希望能对考生们未来的考有帮助。

2021 年8 月29日考题回忆 ——来自教研中心
Passage One	新旧情况	题材	题目	题型
Passage One	新	能源类	Energy from the Ocean	多选（3/7）3 个 Classification 配对 5 个完成句子 5 个
文章大意
答案	多选题（ 7 选 3 ）在海洋中建立 Tidal power plant 的 positive effects？ A. A range of sea shore B. cost of establishing a tidal power plant C. it is helpful to establish transportation system D. effect of fish and some other sea life around 配对题 A. Tidal energy B. Current energy C. Thermal energy 题目均关于三种能量在现阶段开采、使用的程度以及未来发展的潜力（NB） 1. which kind of energy has already been subject to a successful trial A 2. A 3. Which kind of energy has been largely used during the past time? B 4. Which kind of energy has failed in an experiment? C 摘要总结题 1. Water, above 30 ℃, will be 冲到水底产生能量 2. ammonia* 3. 热能机制里用到了水冲刷 turbine 的原理 4. 深度是海底 500 米（答案仅供参考）
Passage Two	新旧情况	题材	题目	题型
Passage Two	新	环境类	Desert Formation	段落信息配对 7 个判断 6 个
阅读原文	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 desert like 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 raindrop s 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: over cultivation, overgrazing, firewood gathering, and over irrigation. 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. The raising of livestock is a major economic activity in semiarid lands, where grasses are generally the dominant type of natural vegetation. The consequences of an excessive number of livestock grazing in an area are the reduction of the vegetation cover and the trampling and pulverization of the soil. This is usually followed by the drying of the soil and accelerated erosion. Firewood is the chief fuel used for cooking and heating in many countries. The increased pressures of expanding populations have led to the removal of woody plants so that many cities and towns are surrounded by large areas completely lacking in trees and shrubs. The increasing use of dried animal waste as a substitute fuel has also hurt the soil because this valuable soil conditioner and source of plant nutrients is no longer being returned to the land. The final major human cause of desertification is soil salinization resulting from over irrigation. Excess water from irrigation sinks down into the water table. If no drainage system exists, the water table rises, bringing dissolved salts to the surface. The water evaporates and the salts are left behind, creating a white crustal layer that prevents air and water from reaching the underlying soil. The extreme seriousness of desertification results from the vast areas of land and the tremendous numbers of people affected, as well as from the great difficulty of reversing or even slowing the process. Once the soil has been removed by erosion, only the passage of centuries or millennia will enable new soil to form. In areas where considerable soil still remains, though, a rigorously enforced program of land protection and cover -crop planting may make it possible to reverse the present deterioration of the surface.
答案	段落信息配对题 1. Migration 在沙漠化的过程中是如何演进的 2. 沙漠形成的类型 3. Soil 是如何从正常土地变成沙漠的 4. 农业和畜牧业对沙漠化的影响 5. 20 世纪的一个沙漠化的例子 6. 利用卫星研究沙漠化判断题 1. 沙漠形成是由于 lack of rain. NG 2. Soil degradation is because of the farm animals. 3. The West Africa still not recover from the droughts. TRUE 4. 关于未来如何处理沙漠化，一些科学还没有找到合理的解决方案。 TRUE （答案仅供参考）
Passage Three	新旧情况	题材	题目	题型
Passage Three	新	科技类	新型飞机(ornithopter) 的发明使用	完成句子 5 个判断题 4 个摘要填空 4 个
文章大意	新型飞机和传统飞机从设计风格，设计材质和操控模式方面的对比。
部分答案	完成句子题： 1.新型飞机特材质是： aluminum 2. fixed wing 3.新型飞机和老式飞机的区别在于新型飞机的机翼得提供 thrust and lift . 判断题： 1.新型飞机的旁侧机翼与它的 central wing 相连。 2.Flow separation 3.跟其他的传统飞机比起来，新型飞机容易 stall。摘要填空题 use a new instrument to scan the land approach ….to take off… （答案仅供参考待补充）