某Na2CO3、NaAlO2的混合溶液中逐滴加入1mol·L-1的盐酸，测得溶液中的CO32-、HCO3-、AlO2—、Al3+离子的物质的量与加入盐酸溶液的体积变化关系如图所示，则下列说法正确的是（ ）
| A．原混合溶液中的CO32-与AlO2—的物质的量之比为1:2 |
| B．V1：V2=l：5 |
| C．M点时生成的CO2为0、05mol |
| D．a曲线表示的离子方程式为：AlO2—+H++H2O=Al(OH)3↓ |
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