题目

下列离子中，电子数大于质子数且质子数大于中子数的是（   ） A.D3O+           B.Li+               C.OD¯           D.OH¯ 答案：DChildren like to _____ what they have but others don’t have, which makes them proud.A. cheer up B. give upC. show off D. put off