人教版英语必修4unit2Using language.ppt

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1、人教版英语必修4unit2UsinglanguageReading on P14 ORGANIC FARMING Organic farming is simply farming without using any chemicals.1.Why are chemical fertilizers so popular in farming today?I.Read the passage and answer the following questions.They are a great way to stop crop disease and increase production.2.

2、What problems can be caused by using chemical fertilizers?They can damage the land by killing helpful bacteria and pests and by staying in the ground and underground water for a long time.They damage peoples health by building up in their bodies and leading to cancer or other illnesses.3.What is org

3、anic farming?Organic farming means growing crops without using any chemicals.4.What is the main reason for using organic farming methods?The main reason for using organic farming methods is to grow good food and to avoid damaging the environment or peoples health.II.Read the text again and fill in t

4、he blanks.Chemical FarmingAdvantages Stopping crop disease and increase _productionChemical FarmingDisadvantagesDamaging the land:killing the helpful _ Damaging peoples health:Many chemicals in the food supply can lead to cancer or other illnesses.Food grows too fast to be full of much _.bacteria an

5、d pestsnutritionOrganic farming_To grow good food and avoid damaging the environment or peoples healthGoalOrganic farmingMethods Using _ waste from animals as fertilizerChanging _ in each field every few years Using _ of soil to plant crops Planting _ between cropsgrassnaturalthe kind of cropdiffere

6、nt levelsIn what condition do you think green food grow?The advantages of green fooddirty air dirty water supplies in industrial areas many chemical fertilizersclean,fresh air clean water supplies away from industrial areas free of chemical fertilizersMain idea of the passageChemical fertilizers can

7、 cause many problems,so organic farming is becoming more popular.ORGANIC FARMINGStructure of the textI using chemical fertilizers for a long time can hurt the land and also peoples healthII Problem caused by chemical fertilizers1.Damage the land by killing the helpful bacteria and pests as well as t

8、he harmful ones2.Lead to cancer or other illness.3.Food grown with chemical fertilizers look beautiful,but inside there is usually more water than vitamins and minerals.Organic farming is becoming more popular with some farmers and many customers after these discoveries came out.IV Other methods to

9、keep the soil fertile.ProjectPersuade the farmers in our county to grow the crops by organic farming with the knowledge learnt.What is organic farming?What fertilizer should they use?Why?How to plant the different crops?Language points1.lead to用法用法寓词于境寓词于境 阅读下列句子，注意阅读下列句子，注意lead to的意的意思和用法。思和用法。1.Hi

10、s carelessness led to the accident.2.This test is obviously bad because it leads to incorrect learning.3.Too much work and too little rest often leads to illness.自我归纳自我归纳 lead to意为意为“_”,后多跟名词或代词。后多跟名词或代词。导致、造成导致、造成(后果后果)联想联想 result in引起引起(某种结果某种结果)、使获得、使获得(某种成某种成果果)、结果、结果。如：。如：The accident resulted

11、in two deaths.result from由由造成、因造成、因而产生。如：而产生。如：Sickness sometimes results from eating too much.即学即练即学即练 用用lead to的适当形式完成句子。的适当形式完成句子。1.Students should always remember that hard work is the main way which _ success.2.The bad weather _ a terrible accident a few days ago.led toleads to2.focus用法用法 猜一猜猜一

12、猜 根据语境推断根据语境推断focus在下列在下列句子中的含义句子中的含义,并从并从a-d中找出与每中找出与每句话中的句话中的focus相符合的英文释义。相符合的英文释义。1.The focus of the meeting changed from population growth to the education of women.2.Bring the object into focus if you want a clear photograph.3.She tried to focus her mind on her work.4.She turned the camera and

13、 focused on Martins face.a.the thing,person,situation,etc.that people pay special attention tob.a point or distance at which the outline of an object is clearly seen by the eye or through a lensc.to point a camera at something,and change the controls slightly so that you can see that thing clearly d

14、.to give special attention to one particular person or thing,or to make people do thisc abd归纳总结归纳总结 focus作名词作名词,意为意为“焦点、中焦点、中心点心点”;作动词作动词,意为意为“集中、聚焦集中、聚焦”,常构常构成短语成短语focus on,意为意为“集中集中(注意力、精注意力、精力等力等)于于”。即学即练即学即练 翻译下列句子。翻译下列句子。1.Because of his strange clothes,he immediately became the focus of attent

15、ion when he entered the office.由于他的奇装异服由于他的奇装异服,所以一走进办所以一走进办公室他便成了大家注意的焦点。公室他便成了大家注意的焦点。2.Focus your camera on those trees.3.Im so tired that I cant focus on anything today.把照相机的焦点集中在那些树上。把照相机的焦点集中在那些树上。今天我太累了今天我太累了,精神集中不起来。精神集中不起来。3.keep free from “远离远离”或或“避免避免”keep free from emotional reactions 避免

16、激动的反应避免激动的反应 keep free from restrictions 避免受到限制避免受到限制 4.Crops such as peas or soybeans put important minerals back into the soil,making it ready for crops such as wheat or corn that need rich and fertile soil.分析分析 本句结构比较复杂。其主干结构为本句结构比较复杂。其主干结构为:主句主句(Crops put important minerals back into the soil)+状

17、语状语(making it ready for crops)。状语中又包含状语中又包含“make+it+形容词形容词”结构和由结构和由that引导的定语从句引导的定语从句(that need rich and fertile soil)。5.Some organic farmers prefer planting grass between crops to prevent wind or water from carrying away the soil,and then leaving it in the ground to become a natural fertilizer for

18、the next years crop.分析分析本句的主干结构是一个简单句本句的主干结构是一个简单句,其结构其结构是是:主语主语(farmers)+谓语谓语(prefer)+并并列宾语列宾语(planting.+leaving.)。其中其中between crops和和in the ground作作地点状语。地点状语。两个宾语后面又分别带有一个不定式两个宾语后面又分别带有一个不定式作目的状语（作目的状语（to prevent wind or water from carrying away the soil和和to become a natural fertilizer for the nex

19、t years crop）。）。I.根据下列各句句意及所给单词的首字根据下列各句句意及所给单词的首字母或汉语提示，写出所缺单词的正确母或汉语提示，写出所缺单词的正确形式。形式。1.The new model will go into p_ next year.2.Because of his poor n_,he has grown weaker and weaker.nutritionproduction3.Those countries are rich in _(矿物的矿物的)resources.4.New scientific d_ are being made every day.5

20、.The group produces a monthly _(摘要摘要)of their research.summarymineraldiscoveries II.用适当的介词填空。用适当的介词填空。1.Costs have been reduced _ 20%over the past year.2.You can focus your telescope _ that distant television tower.3.I hope I havent kept you _ your work.byonfrom4.He made no comments _ what I said at

21、 the meeting.5.“Green food”is grown away _ industrial areas and dirty water supplies.from on/aboutIII.根据括号内的汉语提示根据括号内的汉语提示,完成下列句子。完成下列句子。1.He has _(建立建立)a good business over the years.2.More and more farmers are beginning to _(转向有机耕转向有机耕作作).3.The forest prevents wind and water from _(带走土壤带走土壤).carrying away the soilbuilt upturn to organic farmingHomework Collect some information about the safety and importance of green food.此此课件下件下载可自行可自行编辑修改，修改，仅供参考！供参考！感感谢您的支持，我您的支持，我们努力做得更好！努力做得更好！谢谢!