As a Chinese, I was proud of       Zhang Yimou had done in the Opening Ceremony of the

Beijing Olympic Games.

A．what

B．where

C．that

D．which

临床上检测IgM抗体常用以下哪种ELISA方法

A．双抗体夹心法
B．间接法
C．竞争法
D．双抗原夹心法
E．捕获法