未成熟B细胞表达的抗体是（）。 A.IgM B.IgM、IgD C.IgG D.Ig 发布时间：2017-05-01 22:21 │ 来源：www.tikuol.com 题型：单项选择题 问题： 未成熟B细胞表达的抗体是（）。A.IgMB.IgM、IgDC.IgGD.IgAE.IgE
题型：单项选择题 The children planted more trees and flowers after they ______ Greener China.A. joined B. took part in C. became D. were 查看答案