题目

38．During World War II, he took many photos, ______some captured the emotions of both the soldiers and the civilians in war-torn Europe.        A．from them                     B．of which                 C．by which                D．among them 答案：B 分，H为蓝色溶液，它们的转化关系如下图：     ⑴ B、C两种物质的化学式分别是：B         ，C         ； ⑵ 反应的化学方程式为                    ⑶ 写出物质D与硝酸银溶液的反应的化学方程式                       ⑷ 反应①②③④中属于置换反应的是          .