题目

____ he remained single all his life.   A. Strange though it may seem             B. As it may seem strange    C. Strange although it may seem           D. Because it may seem strange 答案：A 下列热化学方程式书写正确的是 [　　] A． 2SO2＋O22SO3　ΔH＝－196.6 kJ·mol－1 B． H2(g)＋O2(g)H2O(l)　ΔH＝－285.8 kJ·mol－1 C． 2H2(g)＋O2(g)2H2O(l)　ΔH＝－571.6 kJ D． C(s)＋O2(g)CO2(g)　ΔH＝＋393.5 kJ·mol－1