【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．wind is not reliable
C．they can only be built on the sea
D．they might influence the world economy
网考网参考答案：B
网考网解析：
[解析] 句子意思是“风力农场的一个问题是什么 ”答案是风力不是很可靠。这道题比较简单，因为文章的最后一句话就明确指出：“because wind is unreliable”。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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