According to the Energy Information Administration, biomass has been one of the leading renewable energy sources in the United States for several years running through 2007, making up between 0.5 and 0.9 percent of the nation's total electricity supply.In 2008—although the numbers aren't all in yet—wind power probably took over first place because of the rapid development of wind farms across the country.

　　Producing power from biomass helps reduce some 11 million tons of carbon dioxide each year.Some homeowners also try to make their own heat by using biomass materials.Such practice may save homeowners' money, but it also produces a lot of pollution.So, the best way is to encourage power plants to use it.

　　72．Why is biomass considered as “a sort of natural battery”？

　　A．It burns merely plant matter.

　　B．It keeps producing electricity.

　　C．It stores the energy from the sun.

　　D．It produces zero carbon dioxide.

　　73．We learn from the text that in 2008

　　________．

　　A．wind power could

　　be the leader of renewable energy

　　B. there was a rapid growth of electricity production

　　C．biomass might become the main energy source

　　D．0.5～0.9% of power supply came from biomass

　　74．Why does the author encourage power plants to use biomass?

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