题目

Mr. and Mrs. Turner live outside a small town. They have a big farm and they are always busy working on it. Their son, Peter, studied at a middle school. The young man studied hard and did well in his lessons. It made them happy. Last month Peter finished middle school and passed the entrance examination (升学考试). Mrs. Turner was very happy and told the farmers about it. Yesterday morning the woman went to the town to buy something for her son. On the bus she told one of her friends how clever and able her son was. She spoke very loudly. All the people in the bus began to liste现有含NaCl、Na2SO4和NaNO3的混合溶液，选择适当的试剂将其转化为相应的沉淀或固体，从而实现Cl-和NO3-的相互分离。相应的实验过程如下：下列关于四种试剂顺序正确的是A．氯化钡溶液、硝酸银溶液、碳酸钠溶液、硝酸溶液 B．硝酸银溶液、氯化钡溶液、碳酸钠溶液、硝酸溶液 C．氯化钡溶液、硝酸银溶液、硝酸溶液、碳酸钠溶液 D．硝酸银溶液、碳酸钠溶液、氯化钡溶液、硝酸溶液