老师：Hello, everyone. Welcome to my English class. Today we are going to review Unit 5 and Unit 6. So are you ready for the class? Let's begin. Okay, first, let's do the brainstorming. Boys and girls in Unit 5, we have Learned a lot about science. Now, can you tell me what signs do you know? I'll give you 30 seconds. You just think and say, are you ready? Let's begin.
老师：Great. A good job. Well, as you know, in different public places, you can see different signs. Look at this picture. Where is it? That's right. It's a library. So what science can you see in the library? I'll give you some time. You just think and say, great, in the library, maybe we can see these signs. For example, no shouting, no running, no eating or drinking, no smoking. So are your answers right? Great, let's go on. Okay, look at this place. Yes, it's our classroom. So what signs can you see in the classroom? Just think and say, alright, in the classroom, maybe you can see these signs. For example, no talking, no running, no fighting, no pushing, no littering. Now look, we are in the street. What size can you see in the street?
老师：A good job, actually. We can see a lot of signs in the street. For example, stop, no parking, please slow down, no turning around, speed limit. And what about this place? Now we are in the park. So what size can you see in the park? Just think and say, excellent. So maybe you can see these signs in the park. For example, no climbing, keep off the grass. No fishing, don't pick the flowers, no swimming. So are your answers right? Great. Send girls, please read after me. No eating or drinking, no fishing, no smoking, no littering, no swimming, no parking. Wet floor, danger school.
老师：In Unit 5, we have Learned something about prohibitory science. Prohibitory sign is a large sign with a diagonal line in the middle of it. And this kind of science can tell you the things that you cannot do. There are two ways to describe a prohibitory sign. For example, what sign is it? No eating or drinking. Don't eat or drink. What about this sign? No touching, don't touch. Follow me. No doing, don't do. Okay, now, boys and girls, can you try to describe these signs in two different ways? Have a try. Excellent. Let's say them together. No smoking, don't smoke. No parking, don't park. No littering, don't litter.
老师：Actually, there are many different kinds of signs, traffic signs. You can see many different traffic signs in the streets. Have you ever seen these traffic signs, for example? What does it mean? It means you can't ride your bicycle here. So boys and girls, it's your turn to practice. You just choose one and talk about it.
老师：Excellent. A good job. Safety science. Safety science are very important in our daily life. These signs can give you safety inst
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