新人教版高中英语必修4-unit2-Using-language课件.ppt-(纯ppt课件,无音视频素材)

1、Unit 2Working the landUsing languageWords previewchemicalproductionbacteriapestnutritionmineraldiscoveryadj.化学的化学的;关于化学的关于化学的n.生产生产;制造制造n.细菌细菌n.害虫害虫;害兽害兽;害鸟害鸟n.营养营养;滋养滋养;食物食物n.矿物矿物;矿石矿石n.发现发现;发觉发觉focussoilreducerootskim underlinesummarycommentn.焦点焦点;中心点中心点vt.集中集中;聚焦聚焦n.土壤土壤vt.减少减少;减缩减缩n.根根;根源根源vt.浏览

2、浏览;略读略读vt.画底线标出画底线标出;强调强调n.总结总结;摘要摘要;概要概要n.评论评论;议论议论vi.&vt.表达意见表达意见;做出评论做出评论 Expressions preview build up lead to focus on keep free from/of逐渐增强逐渐增强;建立建立;开发开发导致导致;造成造成(后果后果)集中集中(注意力注意力,精力等精力等)于于使使免受免受(影响影响,伤害等伤害等)；使使不含不含(有害物有害物)It is fertilizer.What is the substance we put on the soil to make crops

3、grow?How many kinds of fertilizers do farmers use?Two kinds.They are chemical fertilizers and natural ones.Organic Farmingchemical fertilizer cow dung用化学肥料和有机肥料的区别用化学肥料和有机肥料的区别:ReadingCHEMICAL OR ORGANIC FARMING?B.Long-term use of chemical fertilizers can cause damage to the land and peoples health.

4、A.Problems caused by chemical fertilizers.The main idea of each paragraphP1.P2.D.Farmers and customers turn to organic farming.C.Other methods to keep the soil fertile.P3.P4.Chemical farming advantages problems cause stop crop diseaseincreaseproductiondamage thelandby killingaffect cropsby stayingle

5、ad to cancer/illnessesby building uphave lessnutritionby growingtoo fastOrganic farming methods advantagesuse natural wastemake the soil richin mineralschange the cropput minerals back into soil,makingplant crops with different rootsuse different levels of land plant grass between cropspreventfrom,a

6、 natural fertilizer1.Which statement is WRONG according to the text?A.All crops are organic.B.Recently,the term“organic farming”has gained another meaning.C.All farmers use fertilizers.D.Scientists believe some chemical fertilizers are better for people.Choose the best answer.D2.Which is not the rea

7、son why organic farmers prefer natural waste from animals?A.It can keep the food free from chemicals.B.It can keep the air,soil and water free from chemicals.C.It can kill harmful pests.D.It can make the soil richer in mineral.C3.What is the advantage of using chemical fertilizers?A.Leaving chemical

8、s in the ground for a long time is good for water supply.B.They can get the soil exhausted.C.They can kill helpful bacteria.D.They can kill harmful pest.D 4.The organic farmers do the followings except _.A.adding fertilizers which is rich in mineralB.changing crops every two or three yearsC.planting

9、 seeds in different layers of the soilD.planting grass between crops to prevent the soil from being blown awayA 1.These chemicals in the food supply build up in peoples bodies over time.build up 增强增强;建立建立;开发开发 Hard working conditions build upcharacter.艰苦的工作条件能磨练人的性格。艰苦的工作条件能磨练人的性格。2.Many of these ch

10、emicals can lead to cancer or other illnesses.lead to:导致导致;造成造成Too much work and too little restoften lead to illness.过量的工作和过少的休息会引起疾病。过量的工作和过少的休息会引起疾病。All roads lead to Rome.条条大道通罗马。条条大道通罗马。3.They focus on keeping their soil rich and free of disease.focus on:集中集中(注意力注意力,精力等精力等)于于You should focus yo

11、ur attention onyour work.把注意力集中在你的工作上。把注意力集中在你的工作上。Olympus:Focus on life.奥林巴斯奥林巴斯:瞄准生活。瞄准生活。4.reduce v.减少减少,降低降低e.g.公司尽力通过减少花销来提高利润。公司尽力通过减少花销来提高利润。The company tries to increase profits by_.今年我们已经减少了业务开支。今年我们已经减少了业务开支。We _ expenses this year.reducing costshave reduced5.This also keeps the air,soil,w

12、ater and crops free from chemicals.keeps free from/of:使使免受免受(影响影响,伤害等伤害等);使不含使不含(有害物有害物)We put our books in bookcase to keep them free from dust.You must take care to keep the wound free from the dirt.拓展拓展1)keep from:隐瞒隐瞒,不把不把告诉告诉(某人某人)阻止阻止,避免避免”如：如：He wont be able to keep the truth from his father.

13、You cant keep him from doing that thing.2)free from:使解除使解除,使摆脱使摆脱 如：如：They aim to free the students from too much homework.3)be free of sb/sth:摆脱某人摆脱某人/某物某物Im free of that job at last.Expressions 1.化肥化肥2.对对造成损害造成损害3.洗掉某物洗掉某物4.导致导致;造成造成(后果后果);通往通往5.逐渐增强逐渐增强,建立建立6.另外另外(还有还有)7.使使免受免受(影响影响);8.集中集中(注意力、精

14、力注意力、精力)于于9.每隔几年每隔几年10.避免做避免做chemical fertilizerscause/do damage towash offlead tobulid upin addition(to)keepfree from/offocus onevery few yearsavoid doingExercises cause/do damage to,wash off,lead to,bulid up,in addition(to),keepfree from/of,focus on,avoid doing1.His mistakes _ his failure.2.These

15、chemicals in the food supply_ in peoples bodies over time.3.All roads _ Rome.4.Please _ your mind _ the following problem.5.Children should _ violence.led tobulid upfocusonlead tobe kept free from6.He likes basketball._,he likes football.He likes basketball _ football.7.Little Tom stuck to _ the mud

16、 _ his shoes by himself before he came in.8.I tried to _(meet)him because he always bores me.9.The storm on May 3 _ great _ people in Burma so far.cause/do damage to,wash off,lead to,bulid up,in addition(to),keepfree from/of,focus on,avoid doingIn additionin addition towashingoffavoid meetinghas cau

17、seddamage toThe possible bad effects of chemical fertilizers on the fruit and vegetablesthat we eat today.1 As you listen to this dialogue,keep in mind what you have just read about chemical fertilizers.What is the main topic of the conversation?Listening 1.Paul thinks that Carrie is not telling him

18、 the truth.2.Using chemical fertilizers always makes vegetables empty inside.TrueFalse2 Listen to the dialogue a second time.Decide if the following statements are true or false,according to theconversation.Give your reasons.3.Todays fruit is not as healthy for people as fruit fifty years ago.4.Eati

19、ng more vegetables might not always be good for us.5.All of todays vegetables look healthy but in fact are not.FalseTrueTrueWHATS WRONG WITH THEVEGETABLES?Girl:Hey,Paul,listen to this a magazine article about a farmer who used too much chemical fertilizer on his fields.When his vegetables were picke

20、d,they were all found to be empty!Listening textBOY:Empty?Youre joking,Carrie that cant be true!Girl:I didnt believe it either!This article says this can happen sometimes with vegetables like cucumbers,carrots and pumpkins.This chemical fertilizer makes the vegetables grow fast to look big and beaut

21、iful,but theyre empty inside!BOY:You know,Ive noticed that sometimes my mum buys carrots from the supermarket that have big holes down the center.I guess that must be from using chemical fertilizers!GIRL:Yeah,thats what the magazine says!The main point of the article,though,isnt about holes in our v

22、egetables.Its talking about why the fruit and vegetables we eat today arent as nutritious as the ones our grandparents ate.BOY:What?My mum is always telling me to eat more vegetables,because theyre good for me!GIRL:Yeah,I know my mother says that same thing!And its true-they are good for us but the

23、problem is that they arent healthy enough!All these chemical fertilizers they kill off both the bad and the good things in the ground.The ground doesnt have enough vitamins and minerals any more to help crops grow healthy.BOY:So if our fruit and vegetables were grown with chemical fertilizers,they m

24、ight look healthy,but probably arent really healthy?I guess weve got to stop using so many chemical fertilizers to grow our food!F=Farmer C=CustomerF:Good morning!Would you like some organic carrots this morning?C:Hmm Theyre a little expensive!What is the advantage of?Reading,Speaking and writingSam

25、ple dialogueF:The advantage of these vegetables is that they are green food so they are safe to eat and good for your family.C:But what is the advantage of having green food?I know all vegetables are good for you and those down the road look green too.And I can buy them at half price there.F:Well,le

26、t me explain.Id rather feed my family on green food than other vegetables because they are grown without chemical fertilizers.C:But the price is too expensive!Id prefer to buy good food if I can afford it.F:This is good value for money because youll have healthier children.They wont have to go to th

27、e doctor so often and you wont have to take time off work.In the long run youll be benefit.C:Certainly Id like to buy what is safe and healthy.Perhaps Ill try some of your vegetables and if they are as good as you say,Ill be back next week.WritingBuy the best fruits here We only sell green food in t

28、his shop!Best choice at best price!Safe,healthy,clean,fresh.Far away from any pollution.Main heading This explains that you sell green food.1.No chemical fertilizer,all organic fertilizers 2.Clean air,clean water 3.No poison,no pesticides 4.Home in heavenReasons to buyHealthy food means healthy life

29、.Far away from diseases,without worries,full of happiness.(one reason)Why it is good value.Some English farming proverbsHe who does not rise early never does a good days work.起床不早起床不早,一天的工作干不好。一天的工作干不好。Go to bed with the lamb and rise with the lark.随羔羊就寝随羔羊就寝,与云雀同起。与云雀同起。A barley-corn is better than

30、 a diamond to a cock.对一只公鸡来说对一只公鸡来说,一颗麦粒优于一颗钻石。一颗麦粒优于一颗钻石。The cuckoo comes in April,and stays the month of May;sings a song at Midsummer,and then goes away.布谷鸟布谷鸟,四月来四月来,五月一直在五月一直在,仲夏唱歌，仲夏唱歌，然后就离开。然后就离开。Always take out the meal-tub,and never putting in,soon comes to the bottom.取粮不储粮取粮不储粮,桶底粮光光。桶底粮光光。No mill,no meal.不磨面就没有饭吃。不磨面就没有饭吃。Sow nothing,reap nothing.春不播春不播,秋不收。秋不收。Homework1.Write a summary of the advantages of organic farming and the disadvantages of chemical farming.2.Collect some information about the safety and importance of green food.