题干
She felt of having asked such a silly question when the audience couldn’t help laughing.
A：guilty
B：crazy
C：tired
D：ashamed
答案(点此获取答案解析）
D
A：guilty
B：crazy
C：tired
D：ashamed
＝H2O（g） △H1＝a kJ·
＝2H2O（g） △H2＝b kJ·
＝2H2O（l） △H4＝d kJ·