----Meng Fei had his arm broken while recording If You Are The One in Beijing.

----Really? Then perhaps he ______________ host TV programs for some time.

A．needn’t

B．mustn’t

C．shouldn’t

D．can’t

目前临床用得最多，既方便又准确的反映肾小球滤过率的测定方法为（）

A.非蛋白氮

B.血尿素氮

C.血肌酐测定

D.对氨马尿酸清除试验

E.以上都不是