人教版（2019）选择性必修一 Unit 5 Working the land Reading and Writing课件(共19张PPT)

(共19张PPT)
Unit 5 Working the land : Using language
CHEMICAL VERSUS ORGANIC FARMING
Is keeping away from hunger is our ultimate goal
chemical
chemical pesticides
artificial fertilizers
Chemical farming is farming with_________________
especially _____________________and ____________________
while organic farming is farming without ___________.
chemicals
Learning objectives:
By the end of this class, students will be able to:
identify the structure of the text by skimming and scanning.
figure out the advantages and disadvantages of chemical farming and organic farming by analyzing the text.
write an argumentative essay through critical thinking and cooperation .
小标题
Para 1-2:
chemical farming
Para 3-4:
organic farming
Para 5
conclusion
5
1-2
3-4
1.What are the advantages of chemical farming
part 1(para1-2)
2.What are the advantages of chemical farming
Pre-reading:prediction
topic
point1.
point2.
point3.
detail 1
detail 2
detail 1
1
2
Writing tips: Try to use the structure General to Specific. We can use this method to give a general statement first, and then use specific information to support the main idea.
Pre-reading:prediction
topic
point1.
point2.
point3.
detail 1
detail 2
detail 1
1
2
Writing tips: try to use linking words to make your article logical.
1.What are the advantages of organic farming
2.What organic methods do farmers use to produce rich soil
part 2(para3-4)
3
4
part 2(para3-4)
topic sentence
method1
detail
method1
method1
detail
detail
5
advantages:
Fight crop disease and increase production.
disadvantages:
1.Kill not only harmful bacteria and insects, but also helpful ones.
2.Chemiacls can stay in the soil and underground water sources for a long time.
3.Crops grown with chemicals usually grow too fast to be rich in nutrition.
disadvantages:
Organic farming is nowhere near able to meet the need for food.
vs
Advantages:
advantages:1.Organic farmers focus on keeping their soil rich and free of disease through natural means.2.It makes the soil richer in minerals.3.It keeps the air, soil, water, and crops free of chemicals.
Does the writer do a good job of expressing his/her opinion
Does each paragraph have one main idea
Does each paragraph have at least one detail to support its main idea
Does the writer use the linking words
Does the writer do a good job persuading you to accept his/her opinion
Use this checklist to help you evaluate your partner's draft.
Chemical agriculture and organic agriculture play an important part in modern agriculture, about which I am in favour of organic farming.
It is obvious that using chemical fertilizers has many disadvantages. The chemicals staying inside the crops can lead to cancer or other illnesses. Besides, the crops grow so fast that they contain little nutrition. Organic foods are becoming increasingly popular with customers. There are many reasons for this. The first reason is that as people are richer, they attach great importance to health. Secondly, organic produce simply uses natural fertilizers, making vegetables and fruit tasty and nutritive. Moreover, the produce grows in clean water and never uses pesticides, which is beneficial to our health.
As a saying goes, health is the first wealth, so it is wiser to choose organic food.
topic
2
1
conclusion