As prices fall,wind power has become the fastest growing type of electricity generation-quadrupling(翻两番)worldwide between 1999 and 2005.Modern wind farms consist of turbines that generate electricity.Though it will be more expensive,there is more than enough wind to provide the worlds 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 building Europes largest wind farm,which will power 200,000 homes.The UKs goal is to generate one-fifth of power from renewable sources,mainly wind,by 2020.But this may cause problems,because wind is unreliable.

　　31.According to the passage,which of the following is the most polluting energy resource?

　　A.Petroleum.

　　B.Coal.

　　C.Natural gas

　　D.Water.

　　32.Chinas Three Gorges Dam

　　A.is the first hydroelectric dam in the world.

　　B.is of the same size as the USs Hoover Dam.

　　C.can generate around 3% of world electricity.

　　D.is the largest hydroelectric dam in the world.

　　33.Which country took the lead in making use of tidal currents to produce power in 2003?

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