右图是甲醇燃料电池的结构示意图。甲醇在催化剂作用下提供质子（H+）和电子，电子经外电路、质子经内电路到达另一极与氧气反应，电池总反应为2CH3OH +3O2="=" 2CO2+ 4H2O。下列说法不正确的是
| A．左电极为电池的负极，a处通入的物质是甲醇 |
| B．正极反应式为：O2 + 2H2O + 4e－=4OH－ |
| C．负极反应式为：CH3OH + H2O－6e- =CO2 + 6H+ |
| D．该电池提供1mole-，消耗氧气0．25mol |
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