工业上用铝土矿（主要成分为Al2O3，含SiO2、Fe2O3等杂质）为原料冶炼铝的工艺流程如下：对上述流程中的判断正确的是（ ）
| A．试剂X为稀硫酸，沉淀中含有硅的化合物 |
| B．反应II中生成Al（OH）3的反应为：[A1（OH）4] +CO2=A1（OH）3↓+HCO3— |
| C．结合质子（ H+）的能力由强到弱的顺序是：[Al（OH）4]->OH一>CO32— |
| D．Al2O3熔点很高，工业上还可采用电解熔融A1Cl3的方法冶炼Al |
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