高中Unit 5 Working the Land优质课课件ppt

这是一份高中Unit 5 Working the Land优质课课件ppt，共60页。PPT课件主要包含了Signposts等内容，欢迎下载使用。
In this class, yu will1.wrk ut the cntent, structure and language features f the text；2.write yur pinin in an essay abut chemical farming r rganic farming.
What des the picture shw?
Where?What?Why?…
CHEMICAL VERSUS ORGANIC FARMING
Pre-reading: predictin
Read the text, check yur predictin and answer the questins:What is chemical farming?What is rganic farming?
While-reading: Activity 1
What is chemical farming?Chemical farming is farming using chemical pesticides and artificial fertilizers.
Chemical pesticides and artificial fertilizers have been in widespread use in farming since the middle f the 20th century. (Para1)
What is rganic farming?Organic farming is simply farming withut using any chemicals.
Read the text, and then answer the questins n page 56.1　Why did many farmers welcme the intrductin f chemical farming? 2　What cncerns many peple abut the use f pesticides? 3　What is ne prblem with the use f chemical fertilisers? 4　Hw is rganic farming different frm chemical farming? 5　Why d rganic farmers change the kind f crp grwn in a field every year? 6　 What is the gal f using rganic farming methds? D yu think it can be reached? Why r why nt?
While-reading: Activity 2
Read the text, and then answer the questins n page 56.1　Why did many farmers welcme the intrductin f chemical farming?Many farmers welcmed them as a great way t fight crp diseases and increase prductin. 2　What cncerns many peple abut the use f pesticides? Their lng-term use can smetimes harm bth the land and peple’shealth.
Over time, hwever, what sme scientists have fund is that their lng-term use can smetimes harm bth the land and peple’s health.（Paragraph 1）
Read the text, and then answer the questins n page 56.3　What is ne prblem with the use f chemical fertilisers? Crps grwn with them usually grw t fast t be rich in nutritin.4　Hw is rganic farming different frm chemical farming?Organic farming is simply farming withut using any chemicals. Organicfarmers fcus n keeping their sil rich and free f diseases thrugh natural means.
Read the text, and then answer the questins n page 56.5　Why d rganic farmers change the kind f crp grwn in a field every year? Different crps are grwn because they put imprtant minerals back int the grund，making it ready fr the next batch f crps.6 （1）What is the gal f using rganic farming methds? （2）D yu think it can be reached? Why r why nt? （1）The gal f using rganic farming methds is t grw gd fd while aviding damage t the envirnment r t peple’s health.（2）Yes，I think this gal can be reached. Farmers wrked fr centuries withut using any kinds f chemicals and withut harming the envirnment，and the fd they prduced was just fine.
Match the main ideas (A-D) belw with the paragraphs. Then cmplete the sentences in the table. (P56)
While-reading: Activity 3
Chemical pesticides and artificial fertilizers have been in widespread use in farming … Over time, hwever, what sme scientists have fund is that their lng-term use can smetimes harm bth the land and peple’s health. Fr example, … they ften have less flavr as well.
Paragraph 1-2
D The prblems with chemical farming
Pesticides can kill helpful bacteria and insects.Sme pesticides have been prhibited because f the damage they cause.Crps grwn with chemical fertilizers usually grw t fast t be full f nutritin.
Paragraph 3
A What rganic farming is
Many rganic farmers use natural waste frm animals as fertiliser.
Paragraph 4
C Organic methds fr prducing rich sil
They ften change the kind f crp grwn in each field every year.They als plant crps that use different depths f the sil t help keep it rich.
Paragraph 5
B Why man-made chemicals are still used in farming
Organic farming is nwhere near able t meet the high demand fr fd arund the wrld.
Read the text again and cmplete the table belw with the help f the signpsts in it.
While-reading: Activity 4
Intrduce tw cntrasting pints r facts: n the ne hand…; n the ther hand…;Add mre infrmatin: mrever…; Explain r supprt a pint: fr example…;State a cnclusin: hence...;Say smething that cntrasts with what has just been said: nevertheless...;Give yur wn pinin: persnally…;
They are used t intrduce the prs and cns，and t intrduce the authr’s wn pinin.
Chemical farming
fight crp diseasesincrease prductin (serve the high demand fr fd arund the wrld)
1. pesticide—smetimes harm land and peple’s healthkill helpful bacteria and insectsstay fr a lng time and affect crps, animals and peple 2. chemical fertilizer—nt rich in nutritin and have less flavur
switch t rganic farming
Chemical pesticides and artificial fertilizers have been in widespread use in farming since the middle f the 20th century. When they were first intrduced, many farmers welcmed them as a great way t fight crp disease and increase prductin. Over time, hwever, what sme scientists have fund is that their lng-term use can smetimes harm bth the land and peple’s health.
Paragraph 1
Paragraph 2
Fr example, pesticides can damage… but als helpful nes. In additin, these chemicals … fr a lng time. This affects the crps … and, in turn, the animals and humans wh digest them... In fact, sme pesticides like DDT … As fr chemical fertilizers, … They may lk beautiful n the utside, but inside … and they ften have less flavur as well.
Organic farming
keep sil rich and free frm disease thrugh natural means
natural waste frm animals as fertilizerchange the kind f crp in each field every yearplant diverse crps using different depths f sil
Organic farmingPrblem:unable t serve the high demand fr fd arund the wrldSlutin:There is still a lng way t find a suitable slutin.
As an alternative, sme farmers have switched t rganic farming, and many custmers have turned t rganic fd when they shp at the lcal grcery. … Fr example, many rganic farmers use natural waste frm animals as fertilizer. This makes the sil in their fields richer in minerals. It als keeps the air, sil, water and crps free f chemicals.
smething ffering the pssibility f different chices
Organic farmers als use many ther methds t prduce rich sil. They ften change the kind f crp grwn in each field every year. Fr instance, they may grw crn r wheat … Organic farmers als plant diverse crps that use different depths f sil t help keep it rich. Fr example, peanuts …
Sme peple … What keeps them frm ding s is the fact that chemical farming serves the high demand fr fd arund the wrld. Organic farming is nwhere near able t meet that need. Therefre, there is still a lng way t find a suitable slutin that puts sufficient fd n the dinner table while keeping peple and the envirnment as healthy as pssible.
1. Add mre infrmatin: …, but als… ; …, and …as well; In additin, …; als; Mrever…2. Explain r supprt a pint: Fr example, …; Fr instance, …3. State a cnclusin: Therefre, …; Hence...
4. Say smething that cntrasts with what has just been said: …, but…; …, hwever, …; nevertheless... 5. Sequencing: In turn, …6. Emphasizing: In fact, …7. Intrducing a new tpic/thing: As fr…; As an alternative, …
DiscussinIs the authr f the passage fr r against rganic farming? Hw d yu knw? 2. What ther disadvantages f rganic farming can yu think f?
Pst-reading: Activity 1
Is the authr f the passage fr r against rganic farming? Hw d yu knw?
Sme peple wuld prefer t stp the use f man-made chemicals in agriculture entirely. … Organic farming is nwhere near able t meet that need. Therefre, there is still a lng way t find a suitable slutin that puts sufficient fd n the dinner table while keeping peple and the envirnment as healthy as pssible. (The last paragraph)
2. What ther disadvantages f rganic farming can yu think f?higher cst f prducing fdgreater effrt required t farming …
Write an essay shwing whether yu supprt chemical farming r rganic farming. Cmplete the utline first.(P57)
Pst-reading: Activity 2
Tpic sentence: In my pinin, _____farming is preferable t _____ farming because________.
Pint 1: _________________________ (Detail ) _________________________
Supprting details/evidence
Argument 1 (Tpic sentence)
Organic farmers als use many ther methds t prduce rich sil. They ften change the kind f crp grwn in each field every year. Fr instance, they may grw crn r wheat in a field ne year,and then grw beans there the next. … Organic farmers als plant diverse crps that use different depths f sil t help keep it rich. Fr example, peanuts grw n the grund’s surface, …
Cnclusin: __________________
Cnclusin: In clsing, explring space prvides the wrld with many different benefits.
Opinin: Hwever, thers feel this is a shallw view which fails t realise hw explring space helps us.
Rephrase the pinin
Bdy * argument /tpic sentence * supprting details
Sample writingIn my pinin，rganic farming is preferable t chemical farming because f the benefits t the envirnment and t peple，and because rganic fd is mre nutritius. T begin with，chemical farming harms the envirnment. Since chemical pesticides are nt fund in nature，nrmal natural prcesses cannt get rid f them. Instead， the chemicals tend t accumulate in the sil and water，and are absrbed in the fd chain，where they pisn wildlife and dmestic animals.
This affects us directly，because we end up eating plants，dairy prducts，eggs，and meat that have high levels f pesticides. Think abut it：The purpse f the pesticides is t kill“pests”，that is，t kill insects. Smething that can kill an insect prbably is nt healthy fr a persn t eat. While it may be true that the fd we eat des nt have enugh pesticide in it t kill us immediately，ver the years this pesticide may cause us health prblems r give us diseases such as cancer.
Finally，rganic fd is generally mre nutritius than fd grwn with man-made chemicals. If yu remember a few years ag，there was the case f watermelns literally explding in the fields because they had been given chemicals t make them grw faster. The reasn why they explded was that they cntained t much water，because the farmers had used t many chemicals and the weather was unusually wet. As it turns ut，such chemicals are cmmnly used in farming t grw larger crps mre quickly. D yu really want t eat watered-dwn fruit and vegetables which have been rushed t market? They cannt pssibly taste as gd as rganic vegetables，nr can they be as nutritius. In clsing，I wuld like t suggest buying rganic fd. Yes，the price is a little higher，but the small price we pay extra will bring us huge rewards in the end.
D yu d a gd jb f expressing yur pinin?Des each paragraph have ne main idea?Des each paragraph have at least ne detail t supprt its main idea?D yu sequence the pints in a lgical rder? D yu d a gd jb persuading thers t accept yur pinin?
Use the checklist t review yur draft.
Language pints
教材原句p.55This affects the crps grwn n the land and，in turn，the animals and humans wh digest them.这会影响土里种植的作物，继而影响消化这些作物的人畜。
1 in turn 相应地；转而；依次；轮流The change f the climate makes the earth warmer. In turn，the warmth f the earth changes the climate，t. 气候的变化导致全球变暖。相应地，地球的升温也在改变气候。We will examine each f these methds in turn.我们将依次逐个分析这些方法。【归纳拓展】take turns t d/in ding sth. 轮流做某事It’s ne’s turn t d sth. 轮到某人做某事了。by turns 轮流地，交替地
单句语法填空（1）The children called ut their names ______________turn.（2）［词汇复现］It’s my turn ______________（make）inferences.（3）Thery is based n practice and ______________turn serves practice.（4）The bk is，______________ turns，funny and sad.（5）Tw days after the peratin，the patient tk a turn ______________ the wrse.
句意：这本书时而妙趣横生，时而悲悲戚戚。
take a turn fr the wrse/better（情况）恶化/ 好转。
教材原句p.55As an alternative，sme farmers have switched t rganic farming... 作为一种替代方法，有些农民已经转向有机耕作……2 alternative n. & adj.（1）n. 可供选择的事物There is an alternative that shuld be welcme t all.有一个替代方案，应该所有人都会接受。【归纳拓展】have n alternative/chice but t ’t chse/help but d...除做……之外别无选择an alternative t... 是……的替代物（t 是介词）I had n alternative but t accept the ffer.我除了接受该项提议之外，别无选择。New ways t treat arthritis may prvide an alternative t painkillers.治疗关节炎的新方法可能会提供一种止痛药的替代品。（2）adj.（仅用于名词前）可供替代的；非传统的alternative energy 可替代能源alternative ways/appraches/methds其他的方法alternative suggestins可供选择的建议
单句语法填空（1）The plice had n alternative but ______________（set）the man free withut enugh evidence.（2）Yu can be paid in cash weekly r by cheque mnthly；thse are the tw ______________（alternative）.（3）There must be an alternative ______________peple sleeping n the streets.完成句子（４）I ____________________________________________（除了放弃别无选择）.（5）［词汇复现］____________________________（我们别无选择）but t clarify ur psitin.
alternatives
句意：你的工资可以按周以现金支取，或按月以支票支取；二者可选其一。
句意：一定要想办法解决街头露宿者的问题。
have n alternative/chice but t give it up
We have n alternative/chice
教材原句p.55Organic farmers fcus n keeping their sil rich and free f disease thrugh natural means.有机耕作的农民注重通过天然的方法保持土壤肥沃，没有病害。3 fcus n 关注，聚焦于搭配：fcus ne’s attentin/mind n 集中某人的注意力/ 心思于……This seasn’s fashins fcus n warm tnes and sft lines.本季时装主要流行暖色调和柔和线条。［词汇复现］I regret nt having fcused my mind n my study.我后悔没把心思放在学习上。When smene delivers a speech，yu must fcus n understanding his main ideas. 当有人发表演讲时，你必须集中注意力理解他的主要思想。【归纳拓展】fix ne’s attentin n 把某人的注意力集中于cncentrate n 集中（注意力、精力）于　　　pay attentin t 注意put ne’s heart int 全神贯注于
单句语法填空（1）［词汇复现］When yu nly fcus ______________a big gal，it’s easy t get burned ut by the daily grind（令人疲劳的工作）.（2）With all his attentin fcused ______________ his study，n wnder he has made great achievements.（3）He lay in bed with his eyes ______________（fcus）n the ceiling.（4）The nise made it hard fr me ______________（fcus）n the wrk.（5）There is t much nise. I can’t cncentrate my attentin ______________ the wrk.
句意：当你只将注意力放在一个大目标的时候，你很容易就被日常琐事弄得筋疲力尽。
教材原句p.56Organic farmers als plant diverse crps that use different depths f sil t help keep it rich. 有机耕作的农民也种植土壤深度要求不同的多样化作物，以保持土壤肥沃。4 depth n. 向下（或向里）的距离；深（度）搭配：in depth 全面地；深入地；详细地at a depth f 30 metres在 30 米的深处a metre/ft in depth一米 / 一英尺深I haven’t read the reprt in depth yet. 我还没仔细阅读这份报告。【词语积累】
单句语法填空（1）He was in the ______________（deep） f despair.（2）Sailrs measure the depth ______________the water in fathms（英寻）.（3）In this experiment the brave persn had spent 130 days in a cave，30 feet ______________ depth.（4）It is nt ______________（lng） f life，but depth f life.完成句子（5）Within a mment r tw，its bdy was dragged swiftly by the killers dwn int ____________________________（大海的深处）.（6）The yung man dived t ______________（深度）40 feet.
the depths f the sea
教材原句p.56Organic farming is nwhere near able t meet that need. 有机耕作还远远不能满足这一需求。5 nwhere near 完全没有；远不及He shuld be let nwhere near the jb.不能让他有机会接近这个职位。【词语积累】nwhere adv. 无处；哪里都不 n. 无处；任何地方；无名之地get/g nwhere 没有结果，没有进展get sb. nwhere 让某人毫无进展in the middle f nwhere 在遥远偏僻处ut f/frm nwhere 突然发生，突然出现
完成句子（1）It was ______________ （远不如） as painful as David had expected.（2）Huses had sprung up ___________________（突然出现）n the hills.（3）A negative attitude will ______________（让你毫无进展）.
nwhere near
ut f/frm nwhere
get yu nwhere
教材原句p.56What keeps them frm ding s is the fact that chemical farming serves the high demand fr fd arund the wrld. 他们不能如愿的原因是化学耕作满足了全世界对食物的高需求。【句式分析】本句中 that引导同位语从句，对 fact 的具体内容进行解释说明。同位语从句（1）可以跟同位语从句的名词通常有 news，idea，fact，prmise，questin，dubt，thught，hpe，message，suggestin，wrd（消息），pssibility 等。（2）引导同位语从句的词有连词：that，whether，连接副词：hw，when，where 等。（注：if，which 不能引导同位语从句）I heard the news that ur team had wn.我听到了我们队获胜的消息。I have n idea whether he agrees t the plan r nt.我不知道他是否同意这项计划。
单句语法填空（1）［词汇复现］When the news came ______________her students attained their dreams，she jumped with jy.（2）D yu have evidence ______________ this treatment wrks?（3）The nly way t succeed at the highest level is t have ttal belief ______________ yu are better than anyne else n the sprts field.
空后的内容是对news 的说明，而且从句不缺少成分，故用that 引导同位语从句。
同位语从句中主谓成分完整，故用只起连接作用的that。
that 引导同位语从句，解释说明belief 的具体内容。