—What do you think of the performance today?

—Great! __________ but a musical genius could perform so successfully.

A．All

B．None

C．Anybody

D．Everybody

关于心包积液的CT检查，不正确的是（）

A．心包积液存在于心包的脏、壁层之间 

B．心包积液可能是淋巴液 

C．出血性心包积液的CT密度较低 

D．心包包裹性积液压迫心脏使之变形 

E．心包填塞出现于大量积液的时候