单项选择题

It can be inferred from the passage that before 1910 the normal running time of a film was ______.

A．15 minutes or less
B．between 30 and 45 minutes
C．between 15 and 30 minutes
D．one hour or more
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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
单项选择题
The author's attitude toward photography in the cinema before Griffith can be best described as ______.
A．sympathetic
B．amused
C．nostalgic
D．condescending
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