老师：Hello, welcome to my class. Today we are going to learn Unit 2, topic 2. All these problems are are very serious. Section A. I hope by the end of this class you will be able to 1st, use new expressions such as sandstone, desert, change into etc to describe how sand stones come into being. 2Nd, talk about the importance of trees. Third, realize why and how to protect trees.
老师：通过本节课的学习，希望你能运用所学表达描述沙尘暴是如何形成的，并谈论树的重要性，同时领会树的价值和保护的方法。
老师：look at the pic。 Chair, who is she? That's right. She is Officer Judy from the movie Zootopia. One day she receives some photos and a letter. Now let's listen to see what the letter is about. Dear Officer Judy.
学生：We're citizens of Zootopia. As you can see in photos, the weather is becoming worse and worse in our city, especially when the wind is strong. The sand hurts our faces. Why do we have the sandstorm? Could you help us find out the reason? We really hope our city will be clean and beautiful.
老师：原来，朱迪警官收到的是一封求助信。一位市民反映，近期动物城的天气越来越差，沙尘暴也日益增多，希望朱迪警官能帮忙找到原因。 the prob。 Then there's cereals. Judy decides to investigate at once what causes these sandstorms. Judy turns to Mister Redwood, one of the oldest trees in the world.
老师：朱迪警官马善展开的调查，他首先求助并采访了红木先生。
老师：Now please listen to the conversation between Judy and Mr Redwood and help her number the pictures. Hello, Mister Redwood, may I ask you some questions?
学生：Of course.
学生：Were there sandstorms in the past?
学生：No, there were not. There were many trees in the city.
老师：But why do we have sandstorms now?
学生：Because people cut down too many trees and the forest have gone.
老师：What happened then?
学生：Without forests, the water washes the earth away, and a lot of rich land has changed into desert. As a result, the sandstorms come into being.
老师：Let's check the answer. At first, there were many trees, Balam. People cut down many trees, so the forests have gone and the water can wash the earth away.
老师：这里 wash away 的意思是把什么冲走？ wash the earth away 意为把泥土冲走。 so a lot of land has changed into desert， desert 意为沙漠。 change into desert 的意思是变成了沙漠。
老师：finally sandstorms come into beam， have you got the correct order now its your turn to describe how sandstones come into being。
老师：请你按下暂停键，根据图片和短语的提示，描述一下沙尘暴是如何形成的。 Let's describe together. In the past, there were many trees. People cut down too many trees. As a result, forests have gone. So the water can wash the earth away easily. A lot of rich land has changed into desert. At last Saint storms come into being. After the interview, on Judy's way back to the office, she hears some students talking. Now, let's listen and find out what they are talking about.
学生：What's a strong wind?
学生：Yes, but it's better than the last few years. There were sandstorms before. While I was walking down the street, I c
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