题目

下列各组离子，在碱性溶液中能大量共存，且溶液为无色透明的是（   ） A . K+    MnO4﹣   Cl﹣   SO42﹣ B . Na+    Ba2+    NO3﹣    Cl﹣ C . Na+   SO42﹣    Cu2+   Cl﹣ D . Na+    H+      NO3﹣    SO42﹣ 答案：B听下面一段较长对话，回答以下小题。【1】When will the man leave China?A.In one month.B.In two weeks.C.Next year.【2】Why can’t the man decide when to come to China again?A.His mother hasn’t recovered yet.B.He hasn’t found a job in China.C.He wants to work in America.