②C(s)+O₂(g)=CO(g)；△H= -Q₁kJ/mol

  C(s)+ O₂(g)=CO₂(g)；△H= -Q₂kJ/mol

③4Al(s)+3O₂(g)=2Al₂O₃(s)；△H= -Q₁kJ/mol

  4Fe(s)+3O₂(g)=2Fe₂O₃(s)；△H= -Q₂kJ/mol

④2H₂(g)+O₂(g)=2H₂O(g)；△H= -Q₁kJ/mol

  2H₂(g)+O₂(g)=2H₂O(l)；△H= -Q₂kJ/mol

   A．①②                    B．③④                    C．②④                    D．①③