已知：①向KMnO4
晶体滴加浓盐酸,产生黄绿色气体；②向FeCl2溶液中通入少量实验①产生的气体，溶液变黄色
；③取实验②生成的溶液滴在淀粉KI试纸上,试纸变蓝色.下列判断正确的是
| A．上述实验证明氧化性：MnO-4＞Cl2＞Fe3+＞I2 |
B．上述实验中，共 有两个氧化还原反应 |
| C．实验①生成的气体不能使湿润的淀粉KI试纸变蓝 |
| D．实验②证明Fe2+既有氧化性又有还原性 |
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