The accused woman _______ himself by saying that he killed the man totally out of self-defense and

it was completely an accident.    [ ]

A. guarded    

B. protected    

C. defended    

D. prevented

称肾为“气之根”的主要依据是( )

A．肾藏精

B．肾主水

C．肾主纳气

D．肾精化生元气

E．肾主化气行水