吴茱萸具有的功效是（）。

A.散寒止痛，降逆止呕，助阳止泻

B.祛风止痛，温肺化饮，助阳止泻

C.回阳救逆，温肾助阳，降逆止呕

D.温中止痛，祛风杀虫，降逆止呕

E.温中降逆，理气和胃，助阳止泻

We went through a period_______ communications were very difficult in the countryside.

A．which

B．in which

C．whose

D．with which