A:CH3OH(g)+O2(g) ==H2O(1)+CO2(g)+2H+(aq)+2e -
B:O2(g)+4H+(aq)+4e -==2H2O(1)
C:CH3OH(g) +H2O(1) ==CO2(g)+6H+(aq)+6 e -
D:O2(g)+2H2O(1)+4 e -==4OH-
指出如图所示操作中的错误之处.
—Does the lion come from America?
—__________. It comes from Africa.
—No, she hasn't been ________there before.