汽车的启动电源常用铅蓄电池。放电时的电池反应如下：
PbO2 + Pb + 2H2SO4 
2PbSO4↓+ 2H2O，根据此反应判断下列叙述中正确的（ ）
| A．PbO2是电池的负极 |
B．负极的电极反应式为：Pb + SO － 2e—PbSO4↓ |
| C．PbO2得电子，被氧化 |
| D．电池放电时，溶液酸性增强 |
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