问题详情

TheBushadministrationspurnedthe1997KyotoTreatyonglobalwarmingbecause.
A．theU.S.hasalreadyminimizeditsemissionsofgreenhousegases
B．theU.S.economywasdepressingandcouldn"taffordthecostsofpollutioncontrols
C．theU.S.governmentdidn"twanttoinvestinpollutioncontrols
D．theU.S.thoughttheproblemsofemissionsonlyexistedindevelopingcountries
请帮忙给出正确答案和分析，谢谢！