题目

在含有较多NH4+、Ba2+、NO3ˉ、Clˉ的溶液中还能大量共存的离子是（   ） A . Ag+ B . H+ C . SO42ˉ D . OHˉ 答案：BThe European Union universities are _______ most attractive because they have ______ diversity of cultures and teaching methods.A. the , a??????? B. a , a????????? C. a , the?????????? D. the , the