已知：

(1)Zn(s)＋1/2O₂(g) = ZnO(s) △H =－348.3 kJ/mol
(2)  2Ag(s)＋1/2O₂(g) = Ag₂O(s)    △H =－31.0 kJ/mol
则Zn(s)＋Ag₂O(s) = ZnO(s)＋2Ag(s)的△H等于（   ）

A．－317.3 kJ/mol	B．－379.3 kJ/mol
C．－332.8 kJ/mol	D．317.3 kJ/mol