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第4部分：阅读理解(第31~45题，每题3分，共45分) 下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。 第一篇 Renewable Energy Sources Today petroleum(石油)provides around 40% of the worlds 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.Renewablerefers 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.Chinas Three Gorges Dam is the largest ever.At five times the size of the USs Hoover Dam,its 26 turbines(涡轮机)will generate the equivalent energy of 18 coal-fired power stations.It will satisfy 3% of Chinas 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. | 
