室温时，下列各组离子在指定溶液中可以大量共存的是( )
| A．由水电离出的c(H＋)＝10－12mol/L的溶液中：Na＋、Ba2＋、HCO3—、Cl－ |
| B．无色透明溶液中：K＋、Cu2＋、SO42—、Na＋ |
| C．含有大量AlO2—的溶液中：Na＋、OH－、Cl－、CO32— |
| D．能使pH试纸显红色的溶液中：Na＋、ClO－、Fe2＋、SO42— |
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