Certain actions, especially _____ the hands and feet, can cause offense in many countries because of the various cultures.

A．in

B．by

C．on

D．with

继发性腰椎管狭窄症发病的主要原因（）。

A.急性腰部扭挫伤

B.腰椎退行性变

C.慢性积累性损伤

D.直接暴力损伤

E.风寒湿邪侵袭