It is often _____ that  human beings are naturally equipped tospeak.    [ ]

A. said                          

B. to say    

C. saying                      

D. being said

张力性气胸常见于（）

A、肋骨骨折

B、胸壁挫伤

C、胸壁贯通伤

D、肺裂伤

E、支气管损伤