题目

阅读理解A new collection of photos brings an unsuccessful Antarctic voyage back to life.Frank Hurley's pictures would be outstanding—undoubtedly firstrate photojournalism—if they had been made last week. In fact, they were shot from 1914 through 1916, most of them after a disastrous shipwreck (海难), by a cameraman who had no reasonable expectation of survival. Many of the images were stored in an ice chest, under freezing water, in the damaged wooden ship.The ship was the Endurance, a small, tight, Norwegianbuilt threemaster that was intended to take Sir Ernest Shackleton and a smal比较、分析、归纳是学习化学的有效方法．现有反应：①Zn+CuCl2═ZnCl2+Cu②Cu+2AgNO3═Cu（NO3）2+2Ag③Cl2+2NaBr═2NaCl+Br2④Br2+2NaI═2NaBr+I2（1）通过比较、分析．可以发现上述四个反应有相似之处：均属于四种基本反应类型中的 ______反应．再分析这四个反应前后各元素的化合价，我们还会发现一个相似之处：______．（2）分析反应①和②，可以得到：Zn、Cu、Ag这二种金属的活动性由强到弱的顺序是 ______用相似的思维方法类推到反应③和④中，我们还可以得到：Cl2、Br2、I2三种非金属的活泼性由强到弱的顺序为 ______．