题目

 It is nice to see millions who had nothing but a record of misery and hungry ______ to improve their life and living conditions． A. having the chances         B. have the chance     C. to have the chance    D. had the chance 答案：B已知热化学方程式：H2O（g）=H2（g）+12O2（g）；△H=+241.8kJ/molH2（g）+12O2（g）=H2O（l）；△H=-285.8kJ/mol当1g液态水变为水蒸气时，其热量变化是（　　）A．吸热88 kJB．吸热44 kJC．放热44 kJD．吸热2.44 kJ