题目

1. She                (不知道的)having done wrong. 2. The ceremony was held              (为了纪念)those killed in the war. 3. He                   (本来能完成)his work, but he went to see a movie with his girlfriend. 4. The man                      (据说学习过)abroad for two years. 5. The parents were satisfied with                            (他们的儿子被录取)a key university.一定条件下，碘单质与砹单质以等物质的量进行反应，可得AtI。它与Zn、NH3都能发生反应，化学方程式分别如下：AtI+2Zn==ZnI2+ZnAt2  ， AtI+2NH3(1)==NH4I+NH2At　。则下列叙述正确的是 A．ZnI2既是氧化产物，又是还原产物 B．ZnAt2既是氧化产物，又是还原产物 C．AtI与液氨反应，AtI既是氧化剂又是还原剂 D．AtI与液氨反应，是自身氧化还原反应