单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit,2,Sav,ing,the,Earth,Section C,Topic2 All these problems are very serious.,底圩乡初级中学 王 江,Words and Expressions,on earth,在地球上；究竟，到底,ozone layer,uzun,lei,(r),臭氧层,carbon k:(r)bn,碳,carbon dioxide,k:bn da,ksad,二氧化碳,period p()rid,时期，时代,millions of,无数的，大量的，数以万计的,take away,拿走,pollute plu:t,污染,oxygen ksdn,氧气,radiation redien,放射，放射物,blanket blkt,毛毯，毯子,escape skep,逃跑，逃脱,rise raz,上升，上涨,the greenhouse effect,温室效应,level,levl,水平线，水平,Marsm:z,火星,referrf:(r)to,提到，涉及，有关,Words and Expressions,In our daily life,we should face more environmental problems.,Can you say something about them?,cities,pollute,health problems,factories,the land and the air,dead,cut down,millions of,take away the earth,become desert,What other kinds of environmental problems,can you think of?,What do you know of the following picture,oxygen,a special kind of oxygen,called“ozone”(O,3,),a very big hole in the ozone layer,too much harmful radiation from the sun,CO,2,carbon dioxide,increase a lot,form a“blanket”,the heat from the sun cant escape,cause the level of the sea to rise,called“the greenhouse effect”,or“globe warming”,fewer trees,factory pollution,traffic pollution,the ozone layer,more carbon dioxide,Can you match them?,Can you choose a suitable title for each paragraph from the phrases below?,The earth is 4 600 million years old.We humans have lived on earth for only 35 000 years,but during this period we have changed,our planet,a lot in many ways.,Some things we,ve done are very good for the earth while some are bad,.,_,All over the world,people have cut down millions of trees.When it rains or when the wind blows,the earth is taken away.Forests have,become deserts,so more and more sorts of animals and plants are disappearing.,Fewer Trees,1a,链接资源,p37-1a.mp3,Read and understand,_,In big cities,cars and buses have polluted the air.Many people in cities now have health problems.,_,Factories have also polluted the land and the water.As a result,many rivers and lakes are now dead.,_,Around the earth,theres a special kind of oxygen called“ozone”(,O,3,).It is important to the earth.But now air pollution is destroying,it,and that has made a very big hole in the ozone layer.Too much harmful radiation from the sun passes through the hole and reaches the earth directly.This is very dangerous because this kind of radiation can cause cancer.,Traffic Pollution,Factory Pollution,The Ozone Layer,_,Carbon dioxide(CO,2,)in the air has increased a lot.It mainly comes from burning oil,coal and wood.This has formed a“,blanket,”around the earth.The heat from the sun cant escape so the temperature is rising.This is called“the greenhouse effect”.It causes the level of the oceans to rise and the climate of the earth to change.,All these problems are very serious,so we must do something now.,More Carbon Dioxide,Read 1a again and choose the best answers.,1,、,What does,our planet,mean here?,A.The sun,.,B.Mars,.,C.The moon,.,D.The earth,.,Read 1a again and choose the best answers.,2,、,Which is,NOT,true?,A.Cars can pollute the air.,B.Factories can pollute the water.,C,.The fewer trees,the better.,D,.Not all the things we have done are good for the earth.,3,、,The word,it,in the passage refers to _.,A.CO,2,B.O,3,C.O,2,D.H,2,O,Read 1a again and choose the best answers.,4,、,In the passage,“,blanket,”,refers to,_.,A.carbon dioxide around the earth,B.the ozone layer in the sky,C.the forest,s,around the world,D.pollution all over the world,5,、,The level of the,oceans,is rising because of _.,A.pollution,B.few trees,C.the greenhouse effect D.changes in the climate,Read 1a again and choose the best answers.,6,、,What is the best title for this passage?,A.Environmental Problems,B.Pollution on the Earth,C.Hope for the Future,D.The Greenhouse Effect,（影片）,Summary,1.Words and expressions,1)Be good for,2)rise,2.lets retell 1a,the following expressions,may help you.,4 600 million years old,only 35 000 years,Fewer Trees Traffic Pollution,Factory Pollution The Ozone Layer,more carbon dioxide,Ozone is very important to the earth.,O,3,:,Homework Written work,Discuss the meanings of the following expressions and then write down how they affect the environment.,CO,2,:,the greenhouse effect:,More and more carbon dioxide forms a“blanket”around the earth.,Written work,Discuss the meanings of the following,e,xpressions and then write down how they affect the environment.,Bye-bye!,Thank you for listening,