托福考试

根据网考网考试中心的统计分析，以下试题在2019/7/12日托福考试习题练习中，答错率较高，为：51%
【单选题】Listening 2 "Environmental ScienceClass"
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What aspect of wind power is the lecture mainly about
A、Electrical power inCalifornia
B、Alternative energy sources
C、Problems associated with turbines
D、Wind as a renewable energy option
网考网参考答案：D，答错率：51%
网考网试题解析：
[解析] 6-11 [Narrator] Listen to part of a lecture in an environmental science class. The professor is talking about wind power. [Professor] Today I want to talk with you about another renewable source of energy... wind power. This isn’t a new Q6 concept. In fact, wind has been used for centuries to pump water and launch sailing vessels. But more recently, wind power has been used to generate electricity. By the year 2000, California was using, maybe 15,000 wind turbines to produce about 400 megawatts of electricity. And that was happening at a cost that would be considered competitive with coal or nuclear power. And, although California currently leads the United States in harnessing wind power, there are several other areas that also hold considerable potential for increased production. Texas and the Dakotas alone have enough wind potential to power the nation, but, since the winds there are so variable, well, wind power alone would be unreliable as a primary source of continuous energy. Nevertheless, it could be used as a secondary resource, along with fossil fuels. The strong and Q7 steady winds of the Pacific Northwest, especially in the Columbia River Basin... these winds would be ideal as a supplement to hydroelectric power when the river is experiencing periods of low water levels. Studies by the U.S. Department of Energy indicate that wind power generated from the Great Plains in the middle of the country could supply the continental United States with almost... 75 percent of the electricity required for the region. In another section of the same report, it was noted that wind power is the world’s fastest growing energy source. Since 1998, the capacity for wind energy has increased by more than 35 percent worldwide. And improvements in wind turbine technology in the past couple of decades has improved efficiency, cutting the cost dramatically, from roughly 40 cents to about 4 cents per kilowatt hour, and a new turbine design is being tested with a lower torque, so that may actually move the price closer to 3 cents. Europe currently accounts for ever 17... , Oh, sorry that’s 70... seven-zero percent of the world’s Q8 wind power. India, China, Germany, Denmark, Italy, and Spain have published plans for major increases in wind-generated electricity projects in the next few years, and recent interest and exploration have been initiated in the United Kingdom and Brazil. Remote areas, especially islands, and other regions at a distance from electrical grids are vigorously exploring wind options. Clearly, the global implications not only for cheap energy but also for clean energy could be enormous. And, in some areas, the consumers are even willing to pay a subsidy for the pollution-free energy that wind provides their communities. In Colorado, for instance, through a program called wind source, about 10,000 customers pay an additional $2.50 per month for every 100-killowatt hours of wind power. Legislation in several states in the United States now requires utility companies to guarantee that a percentage of their electricity will be generated from renewable sources like wind power. Of course, there are some problems associated with wind power that do need to be considered. The Q9 blades on the turbines present a hazard to migrating birds.In some cases, the vibrations interfere with television reception in the area. And, there have been objections to wind farms because. they produce noise and because they’re not visually appealing to residents nearby. So, in addition to the studies to improve turbine design and energy efficiency, some of the attendant problems also require research and development. Regarding the noise, let me mention that design modifications, basically modifying the thickness of the turbine blades and making a查看试题解析出处>>