人教版高一英语必修四Unit 2 Working the land Using language 课件（共17张PPT）

Unit2 working the land
Using language
Revision of words and expressions
1.化学的 chemical 2.生产 production
3.细菌 bacteria 4.害虫；害兽 pest
5..营养 nutrition 6.矿物 mineral
7.发现；发觉 discovery 8.土壤 soil
9.减少 reduce 10.根；根源 root
11.浏览 skim 12.画底线标 underline
13.总结；概要 summary 14.评论 comment
1.逐渐增强；建立 build up
2.导致；造成（后果）lead to
3.集中（注意力、精力等）于
focus on
4.使·····免受（影响、伤害等）；使······不含（有害物）
keep...free from/of

chemical fertilizers
natural fertilizers
Reading
Chemical or Organic Farming
Skimming
1. What is organic farming?





Organic farming is simply farming without using any chemicals.
The goal is to grow good food and avoid damaging the envirnment or people’s health.
2. What is the goal of using organic farming methods?
Scanning(Match each paragraph and its main idea)
P.1 Other methods to keep the soil fertile.
P.2 Farmers and customers turn to organic
farming.
P.3 Problems caused by chemical fertilizers.
P.4 Long-term use of chemical fertilizers can
cause damage to the land and people’s
health.
What’s main idea of the passage?
Use one sentence to discribe it.

It talks about chemical farming
can cause many problems, so organic farming is becoming more popular.
Careful reading
Choose the best answer
1.Chemical fertilizers has become very common in farming.Which following reason is WRONG? ( )
A.Chemical fertilizers can stop crop disease.
B.Chemical fertilizers can increase production.
C.Chemical fertilizers can stay in the ground.
D.The crops with chemical fertilizers can grow fast.
2.The problems can be caused by chemical fertilizers EXCEPT which one? ( )
A.They damage the land .
B. They kill the harmful pests.
C. There is more water than vitamins and minerals.
D.Many of these chemicals can lead to cancer or other illness.
C
B
Organic farming
methods
advantages
use natural waste
make the soil rich
in minerals
change the crop
put minerals back
into soil,making…
plant crops with
different roots
use different levels
of land
plant grass between
crops
prevent…from…,
a natural fertilizer
True or False
1.Chemical fertilizers only kill harmful bacteria and pests. ( )
2.Chemicals get inside the crops and cann’t be washed off. ( )
3.Organic farmers seldom change the kind of crop in each feild for years. ( )
4.Fruit ,vegetables and other food grown with chemical fertilizers usually grow too fast ,but they are full of much nutrition. ( ).
5.Organic farmers have many methods to keep the soil fertile. ( )
F
T
F
F
T
Writing a summary
Step1.Skim the passage to find its main idea.Write it
down in your own words.
Step2.Find and underline the topic sentence of each
paragraph . Rewrite each topic sentence using
your own words.
Step3.Write your summary.First state the main idea of
the passage and then the topics covered by
each paragraph .
Step4.Swap summaries with your partner and give each
other comments.
.
One possible version
In recent days, scientists have discovered that using chemical fertilizers can damage to the land and people’s health.There are several problems caused by chemical fertilizers.They damage the land , stay in the water for a long time and get into people’s bodies through their food.Organic farming is becoming popular with some farmers and many customers . Organic farming does not use any chemicals.There are many methods for making the land healthy. All of these methods try to produce good food and keep the environment or people healthy.
Homework
Writing
现如今人们越来越关注饮食问题。假如你
是一位农民，你打算怎样进行农业耕作。把
你的想法写成 一篇小文章。（开头已给出。）
If I were a farmer, I would ...
Thank you
Bye bye
chemical fertilizers
natural fertilizers
chemical fertilizers
natural fertilizers
Choose the best answer
1.Chemical fertilizers has become very common in farming.Which following reason is WRONG? ( )
A.Chemical fertilizers can stop crop disease.
B.Chemical fertilizers can increase production.
C.Chemical fertilizers can stay in the ground.
D.The crops with chemical fertilizers can grow fast.
2.The problems can be caused by chemical fertilizers EXCEPT which one? ( )
A.They damage the land .
B. They kill the harmful pests.
C. There is more water than vitamins and minerals.
D.Many of these chemicals can lead to cancer or other illness.
C
B
hybrid corn
seedless watermelon
What do farmers put into the soil to
make crops grow ?

It’s fertilizer.
What do farmers put into the soil to
make crops grow ?

It’s fertilizer.
What do farmers put into the soil to
make crops grow ?

It’s fertilizer.
There are two kinds of fertilizers.
natural fertilizers
chemical fertilizers
What do farmers put into the soil to
make crops grow ?

It’s fertilizer.