When a gladiator(角斗士) was defeated in the games arena, he might be ______ or he might be killed on the spot.

A．ratio
B．percentage
C．portion
D．rate

A．discuss the importance of Griffith to the development of cinema
B．describe the impact on cinema of the flashbacks and other editing innovations
C．show Griffith's impact on the choice of subject mat ter in American films
D．criticize the state of American cinema before the Griffith