已知2Zn(s)＋O₂(g)=2ZnO(s)ΔH＝－701.0 kJ·mol^－1
2Hg(l)＋O₂(g)2HgO(s)ΔH＝－181.6 kJ·mol^－1
则反应Zn(s)＋HgO(s)=ZnO(s)＋Hg(l)的ΔH为(　　)

A．＋519.4 kJ·mol^－^1	B．＋259.7 kJ·mol^－^1
C．－259.7 kJ·mol^－^1	D．－519.4 kJ·mol^－^1