人教版高中英语必修4Unit2Working the land Using Language 课件（共15张）

课件15张PPT。Chemical or organic farming?Using LanguageBook4 Unit2 Working the land What do you know about “farming”?farming steps
农耕步骤Step1: Review and leading-in What do you know about “farming”?farming steps
农耕步骤Q: What is the substance we put on the soil which makes crops grow?
It is fertilizer. Do you know about organic farming
？Para1
Para2
Para3
Para4Step2: Listening and matching.A. Other methods to keep the soil fertile.
B. Farmers and customers turn to organic farming.
C. Problems caused by chemical fertilizers.
D. Long-term use of chemical fertilizers can cause damage to the land and people’s health.2. There are two kinds. They are chemical fertilizers and natural ones. 3. Organic farming means growing crops without using any chemicals.Q2: How many kinds of fertilizers do farmers use? Step3: Scanning.Q1: Why are chemical fertilizers so popular in farming today?1. They are a great way to stop crop disease and increase production.Q3: What is organic farming? ②Damaging people’s health:①Damaging the land:Q: What problems can be caused by using chemical fertilizers?Step4: Detailed readingTask1: Para.2 ◆ killing the helpful bacteria and pests ◆ Many chemicals in the food supply can lead to cancer or other illnesses.
◆ Food grows too fast to be full of much nutrition.◆ To grow good food and avoid damaging the environment or people’s healthTask2: Para.3-4◆ Using natural waste from animals as fertilizer
◆ Changing the kind of crop in each field every few years
◆ Using different levels of soil to plant crops
◆ Planting grass between cropsclean, fresh air
clean water supplies
away from industrial areas
free of chemical fertilizers Chemical fertilizers can cause many problems, so organic farming is becoming more popular.Step5: Thinking about itIn what condition do you think green food grow?？dirty air
dirty water supplies
in industrial areas
many chemical fertilizersAB给…造成损害
将…洗掉
逐渐增强;建立
导致;通向
集中精力于
使…免受(影响)
另外;除此之外cause damage to
wash off
build up
lead to
focus on
keep...free from/of
in addition (to sth)Step6: Language pointsPhrases
每隔一年=
每两年
每(隔)几年
增强体质
强身健体
转向;向…求助
every two years
every other year
every second year
every few years
build up one's body=
improve one's health
build up a strong body
turn to
Patterns about v-ingIt is/was no good doing sth.
It is/was no use doing sth.
It is/was useless doing sth.
It is/was worthwhile doing sth.
It is a waste of time/money doing sth.
It is fun doing sth.
There is no point/sense (in) doing sth.
There is no pleasure doing sth.做…没有好处。
没有用处。
没有用处。
是值得的。
是浪费时间/金钱。
很有趣。
没有意义。
没有乐趣。1.It's no use ______ (cry) over spilt milk.
2.Thick black ink like that won't________ easily.
3.The oil spill has caused great damage__ the environment.
4.All roads ________ Rome.
5.____________ English, I also like maths.
6.It's no good ___________ (complain) without taking action.
7.All the pressure ________ and he was off work for weeks with stress.Practice1.Read the text more often.
2.Finish the matching test 4.
Step7: HomeworkGoodbye!