－­ ______ does your mother watch the Talk Show?

－ Once a week.

A. How long              B. How often             C. How soon

肾性骨病可有的表现是：()

A．纤维性骨炎

B．肾性骨软化症

C．骨质疏松症

D．肾性骨硬化症

E．以上都是