单选题The scientists are trying

问题补充：

单选题Thescientistsaretryingto___naturalenergytodecreaseairpollution.A.make friends withB.make full use ofC.make notes ofD.make into

答案：

B解析根据句意可知,特别是后面的natural energy to decrease air pollution, 这里选B,意思是:充分利用.