Unit 2 Saving the Earth,Topic2 All these problems are very serious.,Section B,（歌曲1）,Which color do you like best? Why?,Which color can make you the most relaxed?,What can trees do for us?,What can trees do for us?,Our life,Our environment,What will our world be like without trees?,What will our world be like without trees?,sandstorm,desert,human beings,What should we do ?,We should stop,from cutting down trees.,We should prevent people from cutting down trees.,Listen to 1a, answer the questions.,What are they talking about?,What causes this kind of bad weather?,They are talking about sandstorms.,People have cut down too many trees. A lot of rich land has changed into desert.,（录音1）,Read 1a, answer the question.,What are trees functions?,Trees can stop the wind from blowing the earth away.,A lot of water can be saved by forests.,Trees can also prevent the water from washing the earth away.,A.,（影片）,B.,C.,Look at the picture, describe them using the words given.,wash the earth away,Look at the picture, describe them using the words given.,many trees,Look at the picture, describe them using the words given.,change into desert,Look at the picture, describe them using the words given.,forests gone,Look at the picture, describe them using the words given.,sandstorms come into being,Look at the pictures, describe them using the words given.,cut down trees,Number the pictures and then talk about them in groups.,( ),( ),( ),( ),( ),( ),Do you know how sandstorms come into being?,4,1,5,3,6,2,Trees are very useful to us. They can help us p_ the wind from blowing the earth away and stop the s_ from moving towards the rich land. Trees also s_ water from running away. They can keep a great d_ of water. So we must stop people from c_ down too many trees. Otherwise a lot of rich land will change into d_, l_ only sand. We must get rid of (摆脱) this kind of bad b_.,根据句意及首字母提示完成句子。,revent,and,ave,eal,utting,esert,eaving,ehavior,Trees are important to us, what can we do to protect them? We should prevent people from ,Protecting and Saving Water Water is very important to human beings, but not everybody knows how to protect and save it. Here are some ways:,1. Pass laws against water pollution. 2. Stop factories pouring waste water into rivers. 3. Remember to turn the tap off when you leave. 4. Collect and reuse waste water. .,Group work,Read and discuss different ways of protecting and saving water.,Useful expressions,The wind is blowing strongly with lots of sand. People have cut down too many trees. A lot of rich land has changed into desert. And a lot of water can be saved by forests. They can also prevent the water from washing the earth away. Stop factories pouring waste water into rivers.,Bye-bye!,（歌曲2）,