Although thE nAtionAl govErnmEnt hAs introDuCED somE nEw lAws on this suBjECt, it is ______thE stAtE govErnmEnts whiCh ArE rEsponsiBlE For pollution Control.
A、prECisEly
B、primArily
C、progrEssivEly
D、prEliminArily