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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A seed planted in the sensitive lining of an oyster begins a perpetual coating process that forms a pearl.
A. total
B. annual
C. continual
D. habitual
单项选择题
The anhinga is a black water bird that frequents the perimeters of the everglades.
A. waters
B. swamps
C. forests
D. edges
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