人教版 (2019)选择性必修 第一册Unit 5 Working the Land一等奖ppt课件

这是一份人教版 (2019)选择性必修 第一册Unit 5 Working the Land一等奖ppt课件，共39页。PPT课件主要包含了benefits，problems，problem，solution，specific，general，advantages，Contrast，Therefore ，chemical等内容，欢迎下载使用。
In this perid, we willunderstand the differences between chemical and rganic farming and their advantages and disadvantages;learn abut the authr’s writing techniques;learn abut the structure f an argumentative essay；write an argumentative essay t express ur views n chemical farming r rganic farming.
Learning Objectives
01.Pre-reading
Hw much d yu knw abut chemical farming and rganic farming?
pesticides杀虫剂
physical insecticides物理杀虫
Leading in
chemical fertilisers
rganic fertilisers/animals’ waste
If yu are ging t buy sme tmates, which wuld yu chse? Why?
chemical prducts
rganic prducts
Warming up
If yu had a piece f land, which kind f farming wuld yu apply, chemical farming r rganic farming? Share yur reasns.
Warming up Free Talk(Pair Wrk)
Chemical versus Organic Farming
Predict by analyzing the title and bserving the pictures.
1. What is the farmer in the picture ding?2.What is the farmer wearing? Why?
Spraying chemical pesticides n the crps.
A mask and a hat.Maybe the chemical pesticides are harmful t health.
Predictin
What will the passage mainly tell us abut?
The passage will mainly intrduce the , ,and f chemical farming and rganic farming.
characteristics
disadvantages
Match the main idea with each paragraph.
Para 1 Para 2 Para 3 Para 4 Para 5
What rganic farming is.
The prblems with chemical farming.
Sme examples fr the disadvantages f chemical farming.
Organic methds t prduce rich sil.
Why man-made chemical fertilisers are still used in farming.
Read fr the structure Task 1
Divide the text int several parts accrding t the main idea f each paragraph.
Part 1 (para 1-2)
Part 2 (para 3-4)
Part 3 (para 5)
The _______ and _________ f chemical farming.
What rganic farming is and .
hw it keeps the sil rich
The _______and __________f rganic farming.
Read fr the structure Task 2
The benefits and prblems f chemical farming.
Chemical pesticides and artificial fertilisers have been in wide spread 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 peples’ health.Fr example, pesticides can damage the land by killing nt nly harmful bacteria and insects, but als helpful nes. In additin, 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 turn, the animals and humans wh digest them.Many peple wrry that these chemicals may make them ill and even cause cancer.In fact, sme pesticides like DDT have been prhibited in mst cuntries because f the damage they cause t peple and the envirnment. As fr chemical fertilisers, crps grwn with them usually grw t fast t be rich in nutritin. 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.
Read fr the cntent Task 1 Read and answer
Chemical pesticides and artificial fertilisers have been in wide spread 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 peples’ health.Fr example, pesticides can damage the land by killing nt nly harmful bacteria and insects, but als helpful nes. In additin, 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 turn, the animals and humans wh digest them. Many peple wrry that these chemicals may make them ill and even cause cancer. In fact, sme pesticides like DDT have been prhibited in mst cuntries because f the damage they cause t peple and the envirnment. As fr chemical fertilisers, crps grwn with them usually grw t fast t be rich in nutritin. 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.
3. What is ne prblem with the use f chemical fertilisers?
1. Why did many farmers welcme the intrductin f chemical farming?
2. What cncerns many peple abut the use f pesticides?
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. Organic farming is simply farming withut using any chemicals. Organic farmers fcus n keeping their sil rich and free f disease thrugh natural means. 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 instance, they may grw crn r wheat in a field ne year, and then grw beans there the next. Why different crps are grwn is because they put imprtant minerals back int the grund, making it ready again fr the next batch f crps. 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, but many ther vegetables put dwn deep rts. The gal f using different rganic farming methds is t grw gd fd while aviding damage t the envirnment r t peple’s health.
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?
What rganic farming is and hw it keeps the sil rich
Sme peple wuld prefer t stp the use f man-made chemicals in agriculture entirely. 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.
6. What is the gal f using rganic farming methds? D yu think it can be reached? Why r why nt?
The gal f using rganic farming methds is t grw gd fd while aviding damage t the envirnment r t peple’s health. 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.
The prblem and slutin f rganic farming.
rganicfarming
fight crp diseaseincrease prductinlwer cstcrps lk beautiful
healthy fd avid damage t the envirnment r t peple's
harm the land harm peple’s healthharm the envirnmentcrps are less in nutritinless
cannt meet the demand fr fdmre effrts and higher cstsmelly
chemical farming
Read fr the cntent Task 2 Read and fill
There are abundant transitinal wrds used in the text, please circle them and put them int different categries.
hwever, but
fr example, fr instance, in fact
bth…and…, nt nly…but als, in additin, and, als, as well,
why… is because…, therefre
as fr, as an alternative
Read fr the language features
02.While-writing
Write an argumentative essay giving yur pinins n chemical r rganic farming.
Is the authr f the passage fr r against rganic farming? Hw d yu knw? Find ut the evidence in the passage.
high utput but harm bth the land and peple’s health, less flavur, less nutritius
ExamplesDefinitin
gd fd avid damage t the envirnment r t peple’s health
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.
nt fr r against
Discussin Task 1 Grup Wrk
What ther advantages and disadvantages f chemical and rganic farming the authr did nt list? Please add mre.
mature technlgy
eclgical balance
eclgical damage
fd safetyrisks
high technlgy demands
Discussin Task 2 Brainstrm
Which d yu prefer? Share yur reasns.
Discussin Task 3 Thinking
假如你是李华，你班就化学农业和有机农业进行了分组讨论，请写一篇议论文阐述一下你们组的观点。内容包括：1. 你们小组推崇的农业耕种方式；2. 列举至少三个你们小组推崇该农业耕种方式的理由。 注意：1. 词数120左右；2. 可适当增加细节，以使行文连贯。
Hw t write an argumentative essay?
An argumentative essay
Supprting pint2
Supprting pint3
Supprting pint1
Organizatin
Para.1 state yur pinin
Currently, there is a widespread cncern ver the issue that…As is ften the case, … As far as I am cncerned, hwever, …It can be said with certainty that ... S in my pinin, …Nwadays, it has t be nticed that… S I’m cnvinced that…
Useful Expressins
Para.2 supprting pints and details
First f all, there is n denying/dubt the ne hand, … On the ther hand, …Mrever, …. Fr ne thing, … Fr anther,…Lastly,… A case in pint is ... Similarly, we shuld pay mre attentin has been mentined abve, ...
Para.3 give a summary
Persnally, I will cnclude by , I have the reasn t believe that... Frm what has been discussed abve, we may safely draw the cnclusin that…
An argumentative essay
Tpic sentence: In my pinin, ________ farming is preferable t _______ farming because ____________.
Argument 1 (Tpic sentence) +detail: Pint 1: T begin with, ______________.(Detail)_______.Pint 2: What’s mre, _______________.(Detail)_______.Pint 3: Finally,_______________.(Detail)_______.
Cnclusin:In clsing, I am fully cnvinced that__________________.
Outline making
... farming is preferable t... farming because...
Pint 1+ Detail
Pint 2+ Detail
Pint 3+ Detail
Use yur utline and cntent learned in the reading part t write a shrt essay giving yur pinin n the tpic.
Make sure in yur writing, yu
apply subject clauses;
clearly and directly present yur pinins and reasns;
have ne main idea in each paragraph;
have at least ne detail t supprt each f yur pint;
try yur best t persuade the readers t accept yur pinin.
sequence the pints in a lgical rder;
Draft making
Exchange yur draft with a partner, and evaluate fr each ther.
Presentatin
In 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.In additin, , rganic fd is generally mre nutritius than fd grwn with man- made chemicals. 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.
03.Pst-writing
Evaluate chemical farming r rganic farming
Evaluatin
1. Further plish yur writing after the evaluatin.
2. 假如你是李华，最近你居住在美国的朋友Tm打算来中国定居，但他不知道该在城市还是农村安家，就此向你征求意见。请根据以下提示给他回一封电子邮件。
注意：1. 词数100左右； 2. 不要逐字翻译，并适当补充内容； 3. 开头和结尾已给出，不计入总词数。
Assignment