—Do you think yesterday's math problem was difficult?

—Yes. I could _____ work it out. [ ]

A. hardly

B. finally

C. already

D. easily

以幻灯，电影、录像等多媒体教学设备为主要手段的培训方法为（）。

A.游戏法

B.视听法

C.讲授法

D.角色扮演法