— Which is more popular, Yao Ming and Liu Xiang?

— I think            them are popular with us. [ ]

A. either of

B. none of

C. both of

D. all of

X线在医学上应用的原理中不包括()

A．利用其穿透作用进行X线检查 

B．利用其荧光作用进行透视检查 

C．利用其摄片作用进行照片检查 

D．利用其电离作用进行CT扫描 

E．利用其生物效用进行肿瘤治疗