下列各组中的离子,能在溶液中大量共存的是( ) A.K+ H+ SO42﹣ OH﹣ B.Na+ Ca2+ CO32﹣ NO3﹣ C.Na+ Cl﹣ NO3- Ag+ D.Na+ Cu2+ Cl﹣ SO42﹣ 答案:D8.-Why is the librarian looking so hard at me?-You ______ to read aloud in the reading room.( )A.don't supposeB.haven't supposedC.are not supposedD.are not supposing