老师：Hello boys and girls. I'm Miss Zhang. I come from Yinlong Garden Primary School. Today we are going to learn Unified Science review time. Boys and girls in Unit 5, we know many different and interesting signs. Do you remember them? Let's play a game. Quick response. If you see the sign, say its name as quickly as you can. Are you ready? Let's go. Swimming. Working floor, no smoking.
老师：Okay, boys and girls, do you know this sign? It's exit, exit. And we can see it everywhere. And in fact, it's the first sign in the world. Let me tell you some fun fact about it. You can often see this kind of signs everywhere, in the park, on the road and so on. But you may not know that this sign is actually invented by Japanese, because in 1972 and 73, two major fires happened in Osaka and Kumamoto, causing a huge loss. Therefore, Japan held an emergency exit logo design competition. Finally, a designer named oyamazko stood out for more than 3000 people and the green logo was improved by the professor of Art, Buuda. Then it began to be promoted in public places in Japan.
老师：As for how the little green man went to the world, that was in 1987. The little green man presented Japan to attend the ISO International Conference in Paris. Finally, warm.
老师：Now, the little green man has become the most common safety symbol in all the countries of the world, including our country, and has been used until today. But he seems embarked on the journey of accidental injuries. For example, sleep when walking, hit by a stone, hit by a car and so on.
老师：A man felt sorry for him. He decided to publish a book and build website for the little green man. He also gave him a cool name, Mister Pictogram. In order to thank the little green man for his contribution, the association submitted an application hoping that September 10th of each year would be the day of Mister Pictogram. And the application was approved.
老师：Wow, what a great little green man. He helps us in many places like supermarket, Park, shopping center and so on. We can see the little green man and other signs. Can we see in these public play boys and girls? I asked you this question the beginning of the unit. Now I hope you can tell me more answers. You can choose one or two thing to say. Okay, I think and say, okay, boys and girls, I think your answers must be amazing.
老师：But beside these places, there's another place. We can see many signs. Where is it? Follow me. Yes, we can see many signs in the school, but there's a new school in Sine Town. And let me show you around it. Let's go.
老师：On the first floor, there are many tidy classrooms, big library and a bright canteen. Let's go to the second floor. There's a big computer room, a beautiful music room and an art room. But can you see any signs? No, beca
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