人教高中英语必修4Unit2 Working the land Using language （共15张PPT）

(共15张PPT)
Chemical Or Organic Farming?
(P14)
Book4 Unit2 Using Language
New words and expressions:
1. fertile
2. fertilize
3. fertilizer
4. chemical fertilizer
5. farmyard manure
6. chemical farming
7. organic farming
8. crop disease
9. bacteria
10. pest
11. build up
12. long-term use
13. nutrition
14. mineral
15. natural waste from animals

16. keep …free from…

17. different levels of land


肥沃的
施肥
肥料
化学肥料
农家肥
化学耕作
有机耕作
农作物病害
细菌
害虫，害鸟
逐渐增强，堆积
长期使用
营养
矿物，矿石
动物粪便
使…免受…，使 …不含
不同层次的土壤
The farmers are ____________.
The farmer in the first picture is using _______________, while the farmers in the second picture are using ____________.
fertilizing
chemical fertilizers
farmyard manure
Which kind of fertilizers do many farmers use more now?
Which kind of fertilizers do you think is better?
Chemical fertilizers farmyard manure
Chemical Or Organic Farming?

Can you predict(预测) what the writer will
talk about in the passage?

(If you were the writer, what will you
write in the passage?)

Para.1 A. Other methods to keep the soil fertile.
Para.2 B. Farmers and customers turn to
organic farming.
Para.3 C. Problems caused by chemical
fertilizers.
Para.4 D. Long-term use of chemical fertilizers
can cause damage to the land and
people's health.





Skimming（3mins）
Match the main idea with each paragraph.
Detailed reading
Read Para.1 and answer the following questions.
1. Why do many farmers use chemical fertilizers in farming?


2. Is it really a good way to use the chemical fertilizers? Why?



Because they think that chemical fertilizers can stop crop disease and increase production.
对…造成破坏或危害
Because the long-term use of the chemical fertilizers
can cause damage to the land and people's health.
No, it isn't.
Read Para.2 and answer the following questions.
1. How do the chemical fertilizers damage the land?


2. How do the chemical fertilizers damge people's health?


3. Is the food grown with chemical fertilizers full of much nutrition?



They damage the land by killing the helpful bacteria and pests as well as the harmful ones. …stay…. affects…
The chemicals in the food supply build up in people's bodies, many of which can lead to cancer and other illnesses.
No, it isn't.
In fact, inside the food there is more
______ than ______ and _______.
water
vitamins
minerals
Read Para.3 and answer the following questions.
1. What is organic farming?


2. What do the organic farmers use as fertilizer?



3. The natural waste from animals can not _________.
A. make the soil richer in minerals B. make the soil more fertile
C. keep the crops free from chemicals
D. kill the helpful bacteria.

Organic farming is simply farming without using any chemicals.
They often prefer using natural waste from animals as fertilizer.
D
Read Para.4 and answer the following questions.
1. What other methods are used to keep the soil fertile by the organic farmers?




2. What is the same goal of the organic farming methods?



(1)They often _____________________________
(2)Organic farmers also _______________________
(3)Some organic farmers prefer _________________
To grow good food and avoid damaging the environment or people's health.
change the kind of crop in each field every few years.
plant crops to use different levels of soil.
planting grass between crops.
Summary:
Over the past half century, many farmers use the ________________ to stop crop _______ and increase ______________. However, the ___________ use of these fertilizes can cause many problems.
Firstly, the chemical fertilizers ________ the land by ______ the helpful bacteria and pests. Secondly, these chemicals in the food supply _________ in people's bodies and then lead to ______ or other ________. In addition, fruit, vegetables and other food grown with chemical fertilizers usually grow _____ fast ______ be full of ___________. These food has more ______ than vitamins and __________.
chemical fertilizers
disease
production
long-term
damage
killing
build up
cancer
illnesses
too
to
nutrition
water
minerals

With these discoveries, farmers and customers turn to _________ farming, which is farming ________ using any chemicals. Instead, organic farmers prefer using ______________ from animals as fertilizer. The natural waste from animals not only makes the soil richer in __________ and more ________ but also keeps the air, soil, water and crops free from _________.


organic
without
natural waste
minerals
fertile
chemicals
Besides using the natural waste from animals, organic farmers also have other methods to keep the soil _______.
One of the methods is to ________ the kind of crop in each field every few _______. Another method is to plant crops to use different _______ of soil. What's more, planting _______ between crops will be helpful to prevent wind or water from carrying away the ______.
The same goal of these many different organic methods is to grow ________ food and avoid _________ the environment or people's _______.

rich
change
years
levels
grass
soil
good
damaging
health
Chemical or Organic Farming?
Your answer is?
organic farming!
Thank you for attention！