人教版 (2019)选择性必修 第一册Unit 5 Working the Land背景图ppt课件

这是一份人教版 (2019)选择性必修 第一册Unit 5 Working the Land背景图ppt课件，共41页。PPT课件主要包含了课前预习设计，课堂提升素养，chemical，organic，widespread，digest，essential，aspects，root，mineral等内容，欢迎下载使用。

每/日/金/句：Yuan Lngping is an agricultural scientist wh keeps as many as ne billin peple free frm hunger.袁隆平是一位农业科学家，他使多达十亿人免于饥饿。
自读课文　疏通文脉大意Read the text n Pages 55～56 carefully and then chse the best answer.1．Why did many farmers welcme chemical pesticides and artificial fertilisers invlved in farming?A．They can fight crp disease and increase prductin.B．They harm bth the land and peple's health.C．They can help prduce rich sil.D．They are nt expensive.
2．What cncerns many peple abut the use f pesticides?A．Pesticides can damage the land.B．Chemicals can stay in the sil fr a lng time.C．Pesticides can kill harmful bacteria and insects.D．Chemicals may make peple ill and even cause cancer.
3．Why d rganic farmers change the kind f crp grwn in each field every year?A．It can help put imprtant minerals back int the grund.B．It can avid damage t the envirnment.C．It can help increase utput.D．The writer desn't tell us.
4．What is the authr's purpse f writing the text?A．T call n farmers t turn t rganic farming.B．T intrduce sme gd ways t make the sil rich.C．T urge the gvernment t stp using pesticides.D．T give sme advice n hw t increase the utput f crps.
精读课文　疏通理解障碍[读文清障]①chemical/'kemɪkl/adj.与化学有关的；化学的　n．化学制品；化学品②rganic/ɔː'ɡænɪk/adj.有机的；不使用化肥的；有机物的③pesticide/'pestɪsaɪd/n.杀虫剂；除害药物④widespread/'waɪdspred/adj.分布广的；普遍的；广泛的⑤ver time 随着时间的推移⑥bacterium/bæk'tɪəriəm/n.(pl.-ria/-riə/)细菌⑦nt (als)．..不仅……而且……(连接并列成分)⑧in additin 另外，此外in additin t 除……之外(还有，也)
⑨in turn 相应地；转而；依次；轮流⑩digest/daɪ'dʒest/vt.& vi.消化　vt.领会；领悟⑪DDT n．滴滴涕(旧时尤用作农业杀虫剂)⑫as fr 至于，关于⑬ 太……而不能……⑭nutritin/nju'trɪʃn/n.营养；滋养⑮essential/ɪ'senʃl/adj.完全必要的；极其重要的be essential t/fr 对……来说必不可少⑯mineral/'mɪnərəl/n.矿物；矿物质⑰flavur(NAmE-vr)/'fleɪvə/n.味道；特点；特色⑱as well 也，又，同样
⑲alternative/ɔːl'tɜːnətɪv/n．可供选择的事物　adj.可供替代的；非传统的⑳switch t 转变；转向switch ff (用开关)关掉；切断(电源)㉑turn t 转向；求助于；致力于㉒grcery/'ɡrəʊsəri/n.食品杂货店；[pl.]食品杂货㉓fcus n 关注；聚焦于㉔free f 无……的；摆脱了㉕means n．手段；方法㉖instance/'ɪnstəns/n.例子；实例；事例fr instance 例如；比如
㉗wheat/wiːt/n.小麦；小麦籽㉘batch/bætʃ/n.一批a batch f 一批㉙diverse adj.不同的；多种多样的㉚depth/depθ/n.向下(或向里)的距离；深(度)㉛rt/ruːt/n.根；根茎；根部；根源㉜entirely/ɪn'taɪəli/adv.全部地；完整地；完全地entire adj.全部的；整个的，完全的㉝serve the demand 满足要求㉞nwhere near 远不及；离……很远㉟meet the need 满足要求㊱sufficient adj.足够的；充分的
[原文呈现]CHEMICAL① VERSUS ORGANIC② FARMINGChemical pesticides③ and artificial fertilisers have been in widespread④ 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. 1Over time⑤， hwever, what sme scientists have fund is that their lng-term use can smetimes harm bth the land and peple's health．Fr example, pesticides can damage the land by killing nt nly harmful bacteria⑥ and insects, but als⑦ helpful nes.In additin⑧， these chemicals can stay in the sil and undergrund water surces fr a lng time.
This affects the crps grwn n the land and, in turn⑨， the animals and humans wh digest⑩ them.Many peple wrry that these chemicals may make them ill and even cause cancer.In fact, sme pesticides like DDT⑪ have been prhibited in mst cuntries because f the damage they cause t peple and the envirnment.As fr⑫ chemical fertilisers, crps grwn with them usually grw t fast t⑬ be rich in nutritin⑭.They may lk beautiful n the utside, but inside there is usually mre water than essential⑮ minerals⑯， and they ften have less flavur⑰ as well⑱.
As an alternative⑲， sme farmers have switched t⑳ rganic farming, and many custmers have turned t㉑rganic fd when they shp at the lcal grcery㉒.Organic farming is simply farming withut using any chemicals.Organic farmers fcus n㉓keeping their sil rich and free f㉔disease thrugh natural means㉕.Fr example, many rganic farmers use natural waste frm animals as fertiliser.This makes the sil in their fields richer in minerals.It als keeps the air, sil, water, and crps free f chemicals.
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 instance㉖, they may grw crn r wheat㉗in a field ne year, and then grw beans there the next. 2Why different crps are grwn is because they put imprtant minerals back int the grund, making it ready fr the next batch㉘ f crps. Organic farmers als plant diverse㉙crps that use different depths㉚ f sil t help keep it rich. Fr example, peanuts grw n the grund's surface, but many ther vegetables put dwn deep rts㉛. 3The gal f using different rganic farming methds is t grw gd fd while aviding damage t the envirnment r t peple's health.
Sme peple wuld prefer t stp the use f man-made chemicals in agriculture entirely㉜. 4What keeps them frm ding s is the fact that chemical farming serves the high demand㉝ fr fd arund the wrld. Organic farming is nwhere near㉞able t meet that need㉟. 5Therefre, there is still a lng way t find a suitable slutin that puts sufficient㊱ fd n the dinner table while keeping peple and the envirnment as healthy as pssible.
[课文翻译]化学耕作和有机耕作自20世纪中期以来，化学农药和人工化肥在农业中得到了广泛使用。当它们第一次被引进时，许多农民欢迎它们作为一种对抗作物病害和增加产量的好方法。1.然而，随着时间的推移，一些科学家发现，长期使用它们有时会损害土地和人们的健康。例如，农药不仅可以杀死有害的细菌和昆虫，还可以杀死有益的细菌和昆虫，从而破坏土地。此外，这些化学物质会在土壤和地下水源中长期存在。这影响到在土地上生长的作物，进而影响到消化它们的动物和人类。许多人担心这些化学物质会使他们生病甚至致癌。事实上，像滴滴涕这样的杀虫剂在大多数国家已经被禁止了，因为它们对人类和环境造成了破坏。至于化肥，通常施了化肥的农作物生长得太快，无法提供丰富的营养。它们可能外表看起来很漂亮，但里面的水通常比必需的矿物质多，而且味道也不太好。
作为一种选择，一些农民转向有机农业，许多顾客在当地杂货店购物时转向有机食品。有机农业就是不使用任何化学物质的简单农业。有机农场主注重通过自然的方式保持土壤的肥沃和免受病害。例如，许多有机农场主使用来自动物的天然粪便作为肥料。这使得他们地里的土壤矿物质更丰富。它还使空气、土壤、水和农作物不受化学物质的污染。
有机农场主也使用许多其他方法来使土壤肥沃。他们经常每年改变每一块地的作物种类。例如，他们可能一年在一块地里种玉米或小麦，第二年在那里种豆子。2.种植不同的作物是因为它们把重要的矿物质释放回土壤，使其为下一批作物生长做好准备。有机农场主还种植多种作物，利用不同深度的土壤来帮助保持土壤肥沃。例如，花生长在地面上，但许多其他蔬菜扎根很深。3.使用不同的有机耕作方法的目的是种植好的食物，同时避免对环境或人的健康造成损害。有些人宁愿完全停止在农业中使用人造化学品。4.阻止他们这样做的原因是化学农业满足了世界各地对粮食的巨大需求。有机农业远不能满足那样的需求。5.因此，要找到一个合适的解决方案，使人们的餐桌上有足够的食物，同时保持人们和环境尽可能地健康仍然有很长的路要走。
自查语基　落实基本知能Ⅰ.核心词汇根据语境写出正确的单词1．the ________ industry 化学工业2．________ farming 有机耕作3．enjy _________ respect 受到广泛尊重4．need time t ________ infrmatin 需要一些时间来消化信息
5．Experience is ________ fr this jb. 对于这个工作， 经验是非常重要的。6．________ energy 替代能源7．cver all ________ f city life 涵盖城市生活的各个方面8．the ________ f the prblem 问题的根源9．a bttle f ________ water 一瓶矿泉水10．chemical ________ 化学农药
alternative
Ⅱ.拓展词汇根据语境写出相应的派生词1．①prvide ________ fr yu 为你提供营养②________ fd 营养食品2．①at a ________ f 30 metres 在30米深处②take a ________ breath 深深地吸了一口气3．①an ________ different matter 一件完全不同的事情②the ________ village 整个村庄
Ⅲ.重点短语1．____________ 相应地；转而；依次；轮流2．____________ 例如；比如3．____________ 做笔记4．____________ 对……造成损害5．____________ 至于6．____________ 关注7．____________ 富于；有丰富的……8．____________ 免受(影响、伤害等)9．____________ 随着时间的推移10．_______________ 转向有机食品
fr instance
turn t rganic fd
Ⅳ.重点句型1．[句型]现在分词短语作状语[教材]Why different crps are grwn is because they put imprtant minerals back int the grund, _______________________________．种植不同的作物是因为它们把重要的矿物质带回土壤，从而使之适宜于种植下一批作物。2．[句型]状语从句的省略[教材]The gal f using different rganic farming methds is t grw gd fd ____________________ the envirnment r t peple's health.使用不同的有机耕作方法的目的是种植好的粮食，避免损害环境或者人们的健康。
making it ready fr the next batch f crps
while aviding damage t
3．[句型]that引导的同位语从句[教材]What keeps them frm ding s is the fact _________________ ____________________________________．阻止他们这样做的原因是化学农业满足了世界各地对粮食的巨大需求。4．[句型]keep sb./sth.＋adj.(宾补) 意为“使某人/某物……”[教材]Organic farmers fcus n _________________ and free f disease thrugh natural means. 有机农民注重通过自然手段保持土壤肥沃和无病害。
that chemical farming serves the high demand fr fd arund the wrld
keeping their sil rich
探究新知　发展语言知识1.(教材P55)Fr example, pesticides can damage the land by killing nt nly harmful bacteria and insects, but als helpful nes.例如，农药不仅可以杀死有害的细菌和昆虫，还可以杀死有益的细菌和昆虫，从而破坏土地。◎句型公式： nt (als)．..不仅……而且……(1)句中“nt als...”结构意为“不仅……而且……”，其中als可以省略。(2)“nt (als)．..”连接的两个并列成分作主语时，谓语动词的人称与数遵循“就近原则”。
[佳句]　As we all knw, reading classics can nt nly imprve ur study but als enrich ur everyday life.众所周知，阅读古典文学不仅提高我们的学习，也丰富了我们的日常生活。[练通]——补全句子/单句语法填空①Beijing is _______________________________________________ _______ (不仅是我国的政治中心，而且是我国的经济中心)．②Nt nly the students but als the teacher ________ (be) against the plan.[写美]——微写作③它不仅让我们放松，而且给了我们一个更接近大自然的机会。Nt nly __________________ but it als gave us a chance t get clser t nature.
nt nly the plitical centre but als the ecnmic centre f ur cuntry
did it give us relaxatin
2．(教材P55)This affects the crps grwn n the land and, in turn, the animals and humans wh digest them.这影响到在土地上种植的作物，进而影响到消化它们的动物和人类。◎in turn 相应地；转而；依次；轮流(1)by turns 轮流；交替地(2)take turns t d sth. 轮流做某事It is ne's turn t d sth. 轮到某人做某事[佳句]　Thery is based n practice and in turn serves practice.理论以实践为基础，反过来又为实践服务。
[练通]——单句语法填空①He spends t much time n maths, which ________ turn affects the prgress f his ther subjects.②When it was my turn ________ (give) a speech, I was t excited t speak.③When my mther was ill, my brther tk turns ________ (take) care f her.[写美]——微写作④一方面，它不仅有助于强身健体，还相应地帮助我们更有效地学习。Fr ne thing, nt nly des it help t build up ur health, but it als helps us ________________________．
t learn mre effectively in turn
◎digest vt.& vi.消化　vt.领会；领悟　n．文摘(1)digest fd 消化食物digest the infrmatin 领会信息(2)a mnthly news digest 每月新闻摘要[佳句]　Yu shuld allw a little time after a meal fr the fd t digest.饭后你应该留点时间让食物消化。
[练通]——写出下列句中digest的词性和含义⑤Yu shuldn't g swimming until yur fd has had a chance t digest. ________⑥Digested rapidly by the bdy, sugar prvides a quick energy surce. ________⑦The magazine she gave me is Reader's Digest. ________⑧It tk me a lng time t digest the thery put frward at the meeting. ________
3．(教材P55)They may lk beautiful n the utside, but inside there is usually mre water than essential minerals, and they ften have less flavur as well.它们可能外表看起来很漂亮，但里面通常有更多的水分，而不是基本的矿物质，而且它们通常也没有那么多的味道。◎essential adj.完全必要的；极其重要的(1)be essential t 对……不可缺少的(2)It is essential fr sb. t d sth. 对某人来说做某事是必要的It is essential d sth. 做某事是必不可少的
[佳句]　As far as I'm cncerned, mney is nt essential t happiness.就我个人而言，金钱对于幸福并非必不可少。[写美]——补全句子①有必要把这些申请表尽早寄回。It is essential that these applicatin frms ______________________________．②丰富多样的文化生活对这对夫妇而言是至关重要的。A rich and varied cultural life ____________ this cuple.
(shuld) be sent back as early as pssible
is essential fr
4．(教材P55)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.作为一种选择，一些农民转向有机农业，许多顾客在当地杂货店购物时转向有机食品。◎alternative n．可供选择的事物　adj.可供替代的；非传统的(1)have n alternative but t d sth. 别无选择只好做某事an alternative t... ……的替代品(2)alternatively adv. 可供选择地[佳句]　If yu dn't like the schl lunch, yu have the alternative f bringing yur wn.要是你不喜欢学校的午餐， 你可以自己带饭。
[练通]——单句语法填空①In rder t reduce pllutin，we have n alternative but ________ (chse) sme clean resurces.②The Internet als prvides us with a cheap alternative t ___________ (cmmunicate) with thers.[写美]——词汇升级③Faced with COVID-19, we have n chice but t stay at hme t alleviate the serius situatin.→Faced with COVID-19, we have n ________ but t stay at hme t alleviate the serius situatin.
cmmunicating
5．(教材P56)Why different crps are grwn is because they put imprtant minerals back int the grund, making it ready fr the next batch f crps.种植不同的作物是因为他们把重要的矿物质带回土壤，使其为下一批作物生长做好准备。◎句型公式：现在分词短语作结果状语现在分词短语作结果状语，表示自然而然的、意料之中的结果；不定式短语作结果状语表示偶然的、意料之外的结果，且前面常有nly修饰。[佳句]　Nature has prvided ur cuntry with wealthy natural treasures, making it a happy hme fr us.大自然为我们的国家提供了丰富的自然宝藏，使之成为我们幸福的家园。
[练通]——单句语法填空①Unfrtunately his father died, ________ (leave) the family even wrse ff.②He rushed t the airprt, nly ________ (find) that the plane had taken ff.[写美]——应用文佳句③越野比赛使得我们可以临时从学业中走出来，使得我们更加精力充沛、更加高兴。The Crss-Cuntry Running Race allwed us t escape frm ur lessns fr a while, _____________________________．
leaving us mre energetic and happier
6．(教材P56)Organic farmers als plant diverse crps that use different depths f sil t help keep it rich.有机农场主种植多种作物，利用不同深度的土壤来帮助保持土壤肥沃。◎depth n．向下(或向里)的距离；深(度)