题目

下列不属于碱金属单质的通性的是(  ) A.硬度小、密度小、熔点低 B.导热、导电性能强 C.焰色反应的颜色相近 D.强还原性 答案：C 解析:碱金属各元素的焰色反应颜色各不相同，如钠黄、钾紫等。Long,long time ago,there was a mountain.At the top of the mountain _______,in which an old monk used to tell stories.? A. a temple stood B. is there a temple? C. stood a temple D. a temple was there?