—Can you tell me _____ it takes us to get there?        

—Of course I do.             [ ]

A. how many

B. how much

C. how long

胸外伤中多根多处肋骨骨折导致的胸壁软化常导致（）

A.单纯性肋骨骨折

B.Ⅱ型呼吸衰竭

C.矛盾呼吸

D.单纯性气胸

E.单纯性血胸