单项选择题

Questions 27—30 are based on the passage about sign language. You now have 20 seconds to read Questions 27—30. Which of the following was NOT used by Native Americans to make a signal

A．A small horse.
B．Cigarettes.
C．A mirror.
D．Fire arrows.
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单项选择题
At the ancient Olympic Games, all competitors had to be ______.
A．slaves
B．males
C．females
D．prisoners
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