题目

有MgCl2、AlCl3二种溶液，只用一种试剂就可把它们鉴别开来，这种试剂是A．硝酸    B．盐酸    C．氨水   D．NaOH溶液 答案：D The teacher ________ her voice so that everyone could hear her clearly. [　　] A.risesB.raisesC.roseD.raised