there were too many stones on the roads, the soldiers (战士) walked to Lushan County in Ya’an Earthquake.

A．If

B．And

C．So

D．Although

山药的功效是（）

A.补气升阳，益卫固表

B.大补元气，补脾益肺

C.补气健脾，燥湿利水

D.益气养阴，补脾肺肾

E.补气养阴，清火生津