—When will the party be held?

— ______ two weeks' time, _____ 15th July. [ ]

A. In; on

B. In; in

C. On; on

D. At; on

已知下列热化学方程式：

(1)Fe₂O₃(s)+3CO(g)====2Fe(s)+3CO₂(g) ΔH=－25kJ·mol^-1

(2)3Fe₂O₃（s）+CO(g)====2Fe₃O₄(s)+CO₂(g) ΔH=－47kJ·mol^-1

(3)Fe₃O₄(s)+CO(g) ====3FeO(s)+CO₂(g) ΔH= +19 kJ·mol^-1

写出FeO(s)被CO还原成Fe和CO₂的热化学方程式：_________________________________。