下列属于置换反应的是（ ）
A．H2+CuOCu+H2O
B．2KMnO4K2MnO4+MnO2+O2↑
C．HCl+NaOH═NaCl+H2O
D．2Mg+O22MgO
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Cu+H2OK2MnO4+MnO2+O2↑
2MgOCu+H2OK2MnO4+MnO2+O2↑2MgO
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