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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单项选择题
The children of Kuskoy learn to whistle because ______.
A．it is fun
B．it is an important way to communicate
C．it helps them learn to sing
D．it is like the Turkish language
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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