桑螵蛸的功效是（）。
白矾的功效是（）。

A.涩肠温胃

B.燥湿止痒

C.涩肠杀虫

D.固精缩尿，补肾助阳

E.涩肠利咽

Although _____ my opinion, the old professor didn't come up with his own. [ ]

A. against

B. on

C. for

D. in