油镜观察骨髓象，要求连续观察并分类计数多少个有核细胞（）

A.100个或300个

B.800个

C.1000个

D.100个

E.200个～500个

The Grammar-Translation Method was at one time called ______ since it was first used in the teaching of the classical languages of Latin and Greek.

A．aural-oral method

B．mim-men method

C．Audiolingual Method

D．Classical Method