单项选择题

下列关于免疫细胞的叙述，错误的是______。

A．效应T细胞可以释放淋巴因子
B．T淋巴细胞可以产生多种抗体
C．吞噬细胞和淋巴细胞均属于免疫细胞
D．一个效应B淋巴细胞只能产生一种抗体

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单项选择题

A．You must have wronged me.
B．Oh! I’m so sorry about this.
C．Please stop just a second.
D．Are you Mr. Smith
E．But may I ask you something first
F．Is there anything I can do for you
G．Now, sit down please.

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A:You’ve cooked such a delicious dinner,Mrs. White. B:().

A．Sure. What is it
B．It’s very nice of you to say so.
C．It’s nothing.
D．Have a nice trip!
E．Certainly, Here you are.