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【单选题】
已知反应（1）2MnO 2 （s）=2MnO（s）+O 2 （g）的ΔH 1 和反应（2）MnO 2 （s）+Mn（s）=2MnO（s）的ΔH 2 ，则ΔH f （MnO 2 ，s）等于（）A.
ΔH 1 +ΔH 2
B.
ΔH 1 －ΔH 2
C.
ΔH 2 －ΔH 1
D.
2ΔH 2 －ΔH 1
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