题目内容

--- These are certainly beautiful flowers. Thank you so much --- __________ .

A. No, no. It’s nothing
B. You are welcome
C. Yes, I agree
D. Yes, I think so, too

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选择素(seleetins)

--- Hi, Sam, I think you did a good job --- __________ .

A. Thank you
B. Don’t mention it
C. Not at all
D. I did it quite badly

细胞连接包括三种类型，分别是_______、_和_______。

构成锚定连接的蛋白可分为两类：和___。