(2009?大庆)如图所示,夹子开始处于关闭状态,将液体A滴入试管②与气体B充分反应,打开夹子,可发现试管①内的水立刻沸腾了.则液体A和气体B组合可能是( )

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| 液体A | 气体B | |
| A | NaOH溶液 | CO2 |
| B | NaOH溶液 | O2 |
| C | 浓硫酸 | H2 |
| D | 稀硫酸 | NH3 |