【单选题】{{B}}第三篇{{/B}}
RenewableEnergy Sources
Today petroleum (石油)provides around 40% of the world’s energy needs, mostly fuelling automobiles.Coal is still used, mostly in power stations, to cover one-quarter of our energy needs, but it is the least efficient, unhealthiest and most environmentally damaging fossil fuel(矿物燃料). Natural gas reserves could fill some of the gap from oil, but reserves of that will not last into the 22nd century either. Most experts predict we will exhaust easily accessible reserves within 50 years. Less polluting renewable energy sources offer a more practical long-term energy solution. "Renewable" refers to the fact that these resources are not used faster than they can be replaceD、
Hydroelectric(水力发电的) power is now the most common form of renewable energy, supplying around 20% of world electricity.China’s Three GorgesDam is the largest ever.At five times the size of the US’s HooverDam, its 26 turbines(涡轮机) will generate the equivalent energy of 18 coal-fired power stations. It will satisfy 3% ofChina’s entire electricity demanD、
In 2003, the first commercial power station to use tidal (潮汐的)currents in the open sea opened in Norway. It is designed like windmill (风车), but others take the form of turbines.
As prices fall, wind power has become the fastest growing type of electricity generation-quadrupling (翻两番)worldwide between 1999 and 2005. Modem wind farms consist of turbines that generate electricity. Though it will be more expensive, there is more than enough wind to provide the world’s entire energy needs. Wind farms come in onshore and offshore forms. They can often end up at spots of natural beauty, and are often unpopular with residents.And turbines are not totally harmless, they can interfere with radar, alter climate and kill sea birds. Scotland is buildingEurope’s largest wind farm, which will power 200, 000 homes. The UK’s goal is to generate one-fifth of power from renewable sources, mainly wind, by 2020.But this may cause problems, because wind is unreliable.
B．is of the same size as the US’s HooverDam
C．can generate around 3% of world electricity’
D．is the largest hydroelectric dam in the world
网考网参考答案：D
网考网解析：
[解析] 问题问“中国的三峡大坝是……”利用问题句中的特征词Three Gorges Dam作为答案线索，在文章中查找答案相关句：(第2段)The Chinese and Romans used watermills over 2000 years ago. But the first hydroelectric dam was built(被建成)in England(英格兰)in 1870. Hydroelectric power is now the most common(常见的，普通的，共同的)form(形式)of renewable energy, supplying(提供)around 20% of world electricity(电). China’s Three Gorges Dam, which has just been completed, is the largest ever. At five times the size of the US’s Hoover Dam, its 26 turbines will generate the equivalent energy of 18 coal-fired power stations. It will satisfy 3% of the China’s entire electricity demand. Surprisingly，some argue that hydroelectric dams significantly contribute greenhouse gases. 答案相关句说“中国的三峡水坝已经建成，是迄今为止最大的水坝”，该句前面的句子中提到“水力发电大坝”，“水力发电是可再生能源中最常见的形式”，因此判断答案相关句中提到的“最大”，应该就是“最大的水力发电大坝”，因此答案是D。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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