单项选择题

In Kuskoy, whistling as a way of talking started ______.

A．recently
B．hundreds of years ago
C．fifty years ago
D．ten years ago
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单项选择题
In the story, Kuskoy is the name of ______.
A．a man
B．a country
C．a town
D．a village
单项选择题
The high-pitched whistle can heard at a distance of ______.
A．10km
B．5km
C．15km
D．8km
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