单选题The duration of a prolonged blast of the whistle is（）.A2 to 4 secondsB4 to 6 secondsC6 to 8 secondsD8 to 10 seconds
单选题
The duration of a prolonged blast of the whistle is（）.
A
2 to 4 seconds
B
4 to 6 seconds
C
6 to 8 seconds
D
8 to 10 seconds
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