单项选择题

By 1929, two years after the start of the "talkies", motion picture theaters in the United States were attracting 100 million patrons every week.

A．owners
B．actors
C．customers
D．critics
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单项选择题
According to some biologists, the instinct to care for the young is perhaps the most interesting characteristic of animals.
A．actually
B．surprisingly
C．seldom
D．possibly
单项选择题
The history of the exploration of Antarctica recounts many tales of perseverance and suffering.
A．endurance
B．skill
C．generosity
D．disturbance
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