From the passage we know switchgrass is ______.

A．President Bush is war-mania
B．bio-based alternative fuels are trvial as compared with the war in Iraq
C．President Bush sh6uld not remedy the loss brought by the two hurricanes
D．bio-based alternative fuels should be treated as important as fighting a war in Iraq

A．switchgrass is the most ideal raw material for the cellulosic ethanol production
B．corn-based ethanol has higher energy rate than switchgrass-based ethanol
C．corn-based ethanol has been invented and is being refined, but not commericalized
D．switchgrass is directly used as raw material for the cellulosic ethanol production