题目内容

Only after I read the text over again _____ its main idea.

A. that I knew
B. did I knew
C. I could know
D. I did know

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Little ______ when I took the trip where it would lead me.

A. have I known
B. had I known
C. do I know
D. did I know

决定Ab独特型的结构是( )

A. CH1区
B. CH2区
C. 骨架区
D. 铰链区
E. CDR

下列哪种Ag刺激机体B细胞产生Ab不需要Th细胞辅助( )

A. 同种Ag
B. 自身Ag
C. TI - Ag
D. TD-Ag
E. 异嗜性Ag

局部粘膜抗感染的Ig是( )

A. sIgA
B. IgG
C. IgD
D. IgE
E. IgM