题目

已知①H2(g)＋O2(g)===H2O(g) ΔH1＝a kJ/mol ②2H2(g)＋O2(g)===2H2O(g) ΔH2＝b kJ/mol ③H2(g)＋O2(g)===H2O(l) ΔH3＝c kJ/mol ④2H2(g)＋O2(g)===2H2O(l) ΔH4＝d kJ/mol 下列关系式正确的是( ) A．a<c<0       B．b>d>0          C．2a＝b<0        D．2c＝d>0 答案：CDuring the long-term cooperation,Mr Li ________ a smart,honest and trust worthy man．A.appearedB.madeC.turnedD.proved