-Your mum is very kind.

-Yeah, My mum is pretty considerate, you know what_____  ,she always arranges everything around me.

A．she means

B．you mean

C．I mean

D．we mean

钩状效应是指用ELISA一步法测定肿瘤标志物时，标本浓度过（），实测值偏（）的现象，极易造成假阴性

A.低，高

B.高，高

C.高，低

D.低，低

E.高，不变