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1、Welcome to our classAir pollution WATER POLLUTIONNoise pollutionPOLLUTION FIGHTERSList some things we get from trees that we use,eat or drink.New words fighter战斗；斗士 notebook 笔记本 produce 产生 as well as 而且 release释放；放出 underground 地下 oxygen 氧气 one another 互相 warn 警告 hardly 几乎不 nasty令人作呕的 breathe 呼吸 com
2、municate交流；交际 replace 取代；代替 chemistry化学 alive 活力 chemical化学物资 pure 洁净的；纯净的 gas 气体 sip 抿着嘴喝；小口喝 natural 天然的 suppose 猜想1.The pollution fighters are probably scientists()2.A few useful products come from trees.()3.Trees produce harmful gases.()4.Trees can pass information to one another.()Think about t
3、he questions and then choose T or F.FFFTWhat good are trees?Answer the following questions1.We got some useful things from trees,dont we?_2.What useful things can we get from trees?Give some examples_3.Do trees make streets more beautiful and less noisy?_Yes,we do.Wood and rubber.Yes,they do.JUDY Wh
4、y are you so interested in trees,Doctor Ray?DR RAY Theyre the biggest and oldest living things on earth,Judy.JUDY Yes,but what good are trees?They make streets more beautiful and less noisy,but what else can they do?DR RAY Well,theres wood in your pencil and the bench,rubber on the end of your penci
5、l and paper in your notebook-all from trees.And while youre studying at home,do you like to eat an orange,or sip a Coke or a coffee?JUDY Sometimes.POLLUTION FIGHTERS播放暂停 According to the text,choose T or F.1.Trees take oxygen from the air.()2.Trees cool the air and clean the air.()3.Trees are like a
6、ir conditioners.()4.It is wrong that trees do two main things to the air.()F T TF15 air conditionersThree trees|DR Well,the fruit,the nuts for the Coke,and the beans for the coffee all come from trees.And I suppose you also enjoy breathing Pure,cool air.JUDY Of course.DR RAY Then you must thank tree
7、s for that,too.Trees are natural air conditioners.They take harmful gas from the air,and release oxygen into the air.How many people are there in your class,Judy?JUDY Forty six.DR RAY Well,one and a half hectares of trees could produce enough oxygen to keep your whole class alive and healthy for a y
8、ear.JUDY Thats wonderful!DR RAY Trees cool the air as well as clean it.Three trees can do the job of 15 air conditioners running almost all day.播放暂停 1.Do scientists know a lot about trees?_ 2.Can trees really communicate with one another?_ 3.How can trees help one another?_ 4.Can trees share food an
9、d water with one another?_Answer the following questionsNo,they dont.They are only now beginning to understand them.Yes,they can.They can join their roots together underground,and pass food Yes,they can.and water around.Judy You certainly know a lot about trees,Doctor Ray.DR DR Thank you,Judy,but I
10、dont,really.Scientists are only now beginning to understand them.For example,did you know that when insects attack a tree,it can warn its neighbours?The trees can then protect themselves by producing a chemical that makes their leaves taste nasty.And some trees can join their roots together undergro
11、und and pass food and water around.Trees are communicating with one another,but we dont know how.JUDY Are trees in danger?DR RAY In great danger.We cut down and burn millions every year but we replace hardly any of them.We are.destroying our best fighters against pollution.播放暂停Fill in the blanks wit
12、h:danger,beautiful,cooler,healthy,noisy,purer,oxygen,useful,pollution,fruit,paper.1.Trees make streets more _.2.Trees make streets less_.3.Trees make our air _.4.Trees make our air _.5.Trees make _ to keep us alive and_.6.Trees provide us with _things like _and_.7.Trees help us to fight _.8.Trees are in _.beautifulnoisypurercooleroxygen healthyusefulfruitpaperpollutiondanger