The old man lived alone all his life and he a rainy winter evening. A. passed away in B. past away in C. passed away on D. past away on 答案:C甲、乙、丙是三种单质,其中甲是固体;乙、丙是气体;A、B、C、D、E都是化合物,很多建筑物因含有E而受到酸雨的侵蚀.上述物质的相互转化关系如图所示(部分产物已略去):(1)试推断下列物质,写出它们的化学式B ,D .(2)写出下列反应的化学方程式.乙+丙: ,A→C: .C→E: .