Our Math teacher often gives us __________ on how to learn Math.

A．some good advices

B．some good advice

C．an advice

D．some pieces of good advices

治疗滴虫病宜选用（）

A.甲硝唑

B.甲苯咪唑

C.吡喹酮

D.氯喹

E.乙胺嘧啶