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【单选题】
下列关于TI-Ag的描述错误的是（）。A.
LPS属于TI-1 Ag
B.
成熟或未成熟 B细胞均可对TI-1 Ag产生应答
C.
TI-2 Ag表面含多个重复B表位
D.
婴儿的B细胞对TI-1Ag不应答或低应答，但对TI-2Ag仍能应答
E.
TI-Ag不需要T细胞的辅助
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A.
正确
B.
错误
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A.
正确
B.
错误
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A.
that
B.
when
C.
since
D.
as
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A.
市场主导者
B.
市场追随者
C.
市场挑战者
D.
市场补缺者
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