单项选择题

The Moon and most artificial satellites travel around the Earth in elliptical paths.

A. waves
B. orbits
C. voyages
D. flights
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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
单项选择题
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
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