填空题

Why is yellow chosen as one of the traffic lights in many countries

【参考答案】

Yellow is sign of caution.
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A．It would be normal if the car took just four seconds.B．It would be normal if the car took six seconds.C．It would be normal if the car took less than three seconds,D．It would be normal if the car took less than six minutes,
A．It would be normal if the car took just four seconds.
B．It would be normal if the car took six seconds.
C．It would be normal if the car took less than three seconds,
D．It would be normal if the car took less than six minutes,
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