已知某温度时发生如下反应：①C+CO2
2CO；②C+H2OCO+H2③CO+H2OCO2+H2。由此可以判断，在该温度下，C、CO、H2的还原性强弱的顺序是（ ）
A．C＞CO＞H2 B．CO＞C＞H2 C．C＞H2＞CO D．CO＞H2＞C
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