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【单选题】
辅助性T细胞不能诱导A.
B细胞增殖
B.
B细胞分化成浆细胞
C.
记忆性B细胞库的扩增
D.
轻链V、J的连接
E.
B细胞产生抗体的类别转换
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反馈参考答案：
举一反三
【简答题】A．She must learn to understand John's humor better. B．She enjoys John's humor a great deal. C．She doesn't appreciate John's humor. D．She thinks John is not funny enough.
【单选题】Why does Helen look great?
A.
She’s come back from a Vacation．
B.
She’s rested for two days．
C.
She’s been exercising．
【单选题】The ______ look on Miss Wang’s face suggested that she______ great danger.
A.
worrying, is in
B.
worried ,was in
C.
worrying, was
D.
worried, is with
【多选题】按照《故都的秋》一文，江南的秋天，为何总是看不饱、尝不透，赏玩不到十足。（ ）
A.
草木凋零得太慢
B.
空气来得太润
C.
天的颜色显得太淡c
D.
天的颜色显得太淡
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