本书主要呈现孩子在道路上的安全知识，比如说红绿灯、斑马线、护栏、窨井、骑自行车的安全等等。淘气的小德跑到马路上踢足球，多危险啊！来了一辆车，刹车不及时，把小德撞飞了！兰老师来给小德讲解红绿灯的知识，并告诉小德马路上很危险，有很多安全常识要学习！那我们就和小德一起来看一看吧！
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