能产生B细胞活化所需第2信号的分子对是()
A.IL-2与IL-2R
B.CD8与MHC-Ⅰ类分子
C.CD40与CD40L
D.Fas与FasL
E.BCR与B细胞表位
参考答案:C
Alice didn’t want her parents to know___________.
A.what has she done
B.what was she doing
C.how she had done
D.what she was doing
根据迁移内容的不同抽象和概括水平不同,可以将学习迁移分为()
A.正迁移
B.负迁移
C.水平迁移
D.垂直迁移