题目

某无色溶液中可能含有①Na+、②Ba+、③Cl-、④Br-、⑤、⑥中的若干种，依次进行下列实验，且每步所加试剂均过量，观察到的现象如下。 步骤操作现象(1)用pH试纸检验溶液的pH大于7(2)向溶液中加氯水，再加入CCl4振荡，静置CCl4层呈橙红色(3)向所得水溶液中加入Ba(NO3)2溶液和稀硝酸有白色沉淀产生(4)过滤，向滤液中加入AgNO3溶液和稀硝酸有白色沉淀产生下列结论正确的是A.肯定含有的离子是①④⑤              B.肯定没有的离子是②⑥C.不能确定的离根据句意及汉语提示填写单词。【1】Mike felt _______(沮丧) because he failed the math exam.【2】It's blowing heavily outside.Please _______(关上) the window.【3】There were some interesting interviews in the _____________(纪录片)．【4】The students are making _______________(对话) in the English class.【5】There are _____________ (大量) of rain in their hometown in summer.