【題組】71. Buying gifts from Presents for Purpose allows mothers to(A) enjoy good sleep (B) be well-org
E The oldest and most common source(来源) of renewable energy known to man, biomass is one of the mo
【題組】73. We learn from the text that in 2008 ______. (A) Wind power would be the leader of renewabl
【題組】74. Why does the author encourage power plants to use biomass? (A) To prevent the waste of energ
【題組】75. Where does the text probably come from?(A) A research plan. (B) A science magazine(C) A book