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1、智 课 网 托 福 备 考 资 料托福阅读练习：Electricity from WindSince 1980, the use of wind to produce electricity has been growing rapidly. In 1994 there were nearly 20,000 wind turbines worldwide, most grouped in clusters called wind farms that collectively produced 3,000 megawatts of electricity. Most were in Denma
2、rk (which got 3 percent of its electricity from wind turbines) and California (where 17,000 machines produced 1 percent of the states electricity, enough to meet the residential needs of a city as large as San Francisco). In principle, all the power needs of the United States could be provided by ex
3、ploiting the wind potential of just three statesNorth Dakota, South Dakota, and Texas.Large wind farms can be built in six months to a year and then easily expanded as needed. With a moderate to fairly high net energy yield, these systems emit no heat-trapping carbon dioxide or other air pollutants
4、and need no water for cooling; manufacturing them produces little water pollution. The land under wind turbines can be used for grazing cattle and other purposes, and leasing land for wind turbines can provide extra income for farmers and ranchers. Wind power has a significant cost advantage over nu
5、clear power and has become competitive with coal-fired power plants in many places. With new technological advances and mass production, projected cost declines should make wind power one of the worlds cheapest ways to produce electricity. In the long run, electricity from large wind farms in remote
6、 areas might be used to make hydrogen gas from water during periods when there is less than peak demand for electricity. The hydrogen gas could then be fed into a storage system and used to generate electricity when additional or backup power is needed.Wind power is most economical in areas with ste
7、ady winds. In areas where the wind dies down, backup electricity from a utility company or from an energy storage system becomes necessary. Backup power could also be provided by linking wind farms with a solar cell, with conventional or pumped-storage hydropower, or with efficient natural-gas-burni
8、ng turbines. Some drawbacks to wind farms include visual pollution and noise, although these can be overcome by improving their design and locating them in isolated areas. Large wind farms might also interfere with the flight patterns of migratory birds in certain areas, and they have killed large b
9、irds of prey (especially hawks, falcons, and eagles) that prefer to hunt along the same ridge lines that are ideal for wind turbines. The killing of birds of prey by wind turbines has pitted environmentalists who champion wildlife protection against environmentalists who promote renewable wind energ
10、y. Researchers are evaluating how serious this problem is and hope to find ways to eliminate or sharply reduce this problem. Some analysts also contend that the number of birds killed by wind turbines is dwarfed by birds killed by other human-related sources and by the potential loss of entire bird
11、species from possible global warming. Recorded deaths of birds of prey and other birds in wind farms in the United States currently amount to no more than 300 per year. By contrast, in the United States an estimated 97 million birds are killed each year when they collide with buildings made of plate
12、 glass, 57 million are killed on highways each year; at least 3.8 million die annually from pollution and poisoning; and millions of birds are electrocuted each year by transmission and distribution lines carrying power produced by nuclear and coal power plants. The technology is in place for a majo
13、r expansion of wind power worldwide. Wind power is a virtually unlimited source ofenergy at favorable sites, and even excluding environmentally sensitive areas, the global potential of wind power is much higher than the current world electricity use. In theory, Argentina, Canada, Chile, China, Russi
14、a, and the United Kingdom could use wind to meet all of their energy needs. Wind power experts project that by the middle of the twenty-first century wind power could supply more than 10 percent of the worlds electricity and 10-25 percent of the electricity used in the United States. 以上就是小编带来的新托福阅读的模拟，大家都做完了吗，每天练 习3.4个阅读，最好把生词给记下来，每天把之前的生词都熟悉一下， 这种不断地加深印象，到了考试的时候不管是在阅读中或者是写作中都 会起到很好的效果。浏览此文的朋友还看过：托福阅读经典加试题目分析新托福阅读真题答题技巧详解之词汇题新托福阅读考试关键技巧：区别对待五种题型新托福阅读考试中暗藏玄机
