单项选择题

There is a ______ of three men to one woman in this factory.

A．ratio
B．percentage
C．portion
D．rate
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单项选择题
The primary purpose of the passage is to ______.
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
单项选择题
The author suggests that Griffith's film innovations had a direct effect on all of the following except ______.
A．film editing
B．scene composing
C．camera work
D．sound editing
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