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1、教师寄语：I hope all the students in our class will be brave to act in this class.lets have fun learning English together!Trees are useful to man in three very important ways.The first important way is that they provide man with food,wood and other products.Trees provide man and animals with food to live
2、 on the earth.Its not easy for man to live on the earth without trees.The second important way is that trees give us shade.On a hot summer day,people are eager to(急于急于)have a rest under the shade of a tree after they have walked a long way.You can imagine how important the shade of a tree is to man
3、and animals.The third important way is that trees help to prevent droughts and floods.However,in many parts of the world,man has not realized the third important way.Read silently and understand.What can trees do for us?Trees are _and _ to human beings.useful importantUnit 2 Saving the EarthTopic2 A
4、ll these problems are very serious.Topic2 All these problems are very serious.Section BSection BSection BSection BTrees are important to us主讲人：主讲人：故县一中故县一中 李慧苹李慧苹New words:sand,sandstorm,desert,prevent,although,law,tapUseful sentences:What bad weather!Trees can prevent the wind fromTrees can stop th
5、e water fromA lot of water can be saved byA lot of rich land has changed intoPeople have cut down too many trees.Topic 2Section B树树和和水水的的重重要要性性Key phrases:Cut down,change intoprevent/stop/keepfrom doing e into being,human being,turn off/on/up/down知识目标 sand sandstorm desert tap turn off theAlthough h
6、e was tired,he didnt stop cutting down trees until he finished.But his action has broken the law.We should prevent people from cutting down trees.sandstorms1c Number the pictures.()()()()()()()()()()()()Do you know how sandstorms come into being?415362Look at the picture,describe how sandstorms come
7、 into being using the words given.many trees cut down treesLook at the picture,describe how sandstorms come into being using the words given.forests goneLook at the picture,describe how sandstorms come into being using the words given.wash the earth awayLook at the picture,describe how sandstorms co
8、me into being using the words given.change into desertLook at the picture,describe how sandstorms come into being using the words given.sandstorms come into beingLook at the picture,describe how sandstorms come into being using the words given.Tell us how sandstorms come into being.many trees cut do
9、wn trees forests gone wash the earth away change into desert sandstorms come into being1a Kangkang,Maria and Jane are talking in a room.The wind outside is blowing strongly with a lot of sand.Listen to 1a again,answer the questions.1.What are they talking about?2.What causes this kind of bad weather
10、?They are talking about sandstorms.People have cut down too many trees.A lot of rich land has changed into desert.Trees can stop the wind from blowing the earth away.Read 1a,answer the question.Trees can also prevent the water from washing the earth away.What are trees functions(作用作用)?A lot of water
11、 can be saved by forests.1.1.砍倒砍倒 2.2.转换成，变成转换成，变成 3.3.防止防止做做（3 3个）个）4.4.多糟糕的天气呀！多糟糕的天气呀！5.5.树能防风固土。树能防风固土。6.6.森林可以储存大量的水分森林可以储存大量的水分 /大量大量的水分可以被森林储存。的水分可以被森林储存。7.7.树木也能防止水土流失。树木也能防止水土流失。8.8.许多良田已经变成了沙漠。许多良田已经变成了沙漠。9.9.人们已经砍掉了太多的树。人们已经砍掉了太多的树。Group work:Read 1a again and find out the following key p
12、oints.keep/stop/preventfrom doing sth.Eg:Nothing can keep/stop/prevent him from realizing his dream.Try to retell 1aWhat bad weather!The wind is.I couldnt seeand my face hurt whilecut down.As a result,changed intostop the wind from can be saved by prevent the water from.is harmful to.Although,we sti
13、ll1234 Trees are very useful to us.They can help us p_ the wind from b_ the earth away and stop the s_ from moving towards the rich land.Trees also save water from running away.They can keep a great deal of water.So we must stop people from c_ down too many trees.Otherwise a lot of rich land will ch
14、ange into d_,leaving only sand.We must get rid of(摆脱摆脱)this kind of bad b_.根据句意及首字母提示完成句子。根据句意及首字母提示完成句子。revent andutting esert ehavior lowing 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
15、 water pollution.2.Stop factories pouring waste water into rivers.3.Remember to turn the tap offoff when you leave.4.Collect and reuse waste water.The earth is short of water now,if we dont save water from now on,The last drop of water will be.What else can we do to protect and save water?What else can we do to protect and save water?What else can we do to protect and save water?What else can we do to protect and save water?What else can we do to protect and save water?What else can we do to protect and save water?What else can we do to protect and save water?Bye-bye!Bye-bye!