Theoldestandmostcommonsource(来源)ofrenewableenergyknownt...
问题详情：Theoldestandmostcommonsource(来源)ofrenewableenergyknowntoman,biomassisoneofthemostimportantformsenergyproductionintheUnitedStatesandelsewhere.Sincesuchawidevarietyofbiomassmaterialsiseverywhe...