已知：（1）Zn（s）+
O2（g）=== ZnO(s)，ΔH=" -348.3" kJ·mol-1，
（2）2Ag(s)+ O2（g）=== Ag2O(s)，ΔH=" -31.0" kJ·mol-1，
则Zn（s）+ Ag2O(s) === ZnO(s)+ 2Ag(s)的ΔH等于（ ）
| A．-379.3 kJ·mol-1 | B．-317.3 kJ·mol-1 |
| C．-332.8 kJ·mol-1 | D．317.3 kJ·mol-1 |
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