Traffic Lights

责任编辑:Winnie 发表时间:2013年10月26日 10:22 浏览次数:2642
No.A17748

There are traffic lights at many crossroads.Traffic lights are important.They tell you when to go and when to stop.When the green light is on, you can go.When the red light is on ,you must not go.You must stop .You watch the lights .Now the green light is on again.You can go.

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