题目

When he got home last night, it ________ hard.A. is raining B. was raining C. rains D. rained 答案：B11．下列叙述I和II均正确并有因果关系的是（　　）选项叙述Ⅰ叙述ⅡA1-己醇的沸点比己烷的沸点高89℃1-己醇和己烷可通过蒸馏初步分离B原电池可将化学能转化为电能原电池需外接电源才能工作CH2SO4是离子化合物硫酸溶液可导电D乙二酸可与KMnO4溶液发生反应乙二酸具有酸性A．AB．BC．CD．D