人教版高中英语必修四 unit2 working the land Using language(共21张PPT)

Unit 2 Using language
Reading
First reading ( 3ms )
Read the passage , then find out the main idea of each paragraph.
Para 1:
Para 2:
Para 3:
Para 4:
Long-term use of fertilizers can cause damage to the land and people ‘s health.
The problem caused by chemical fertilizers .
Some farmers and many customers are beginning to turn to organic farming.
Organic farmers also use many other methods to keep the soil fertile.
Second reading ( 5ms )
Read the text again and answer the following questions:
1 Why are chemical fertilizers so popular in farming today?
2 What problems can be caused by using chemical fertilizers ?
3 What is organic farming ?
4 What is the main reason for using organic farming methods ?
1.Why are chemical fertilizers so popular in farming today ?
They can stop crop disease and increase production.
2 What problems can be caused by chemical fertilizers ?
There are three problems. First, chemical fertilizers affect the soil and the water supply badly. Second, they allow farmers to grow the same crop year after year and exhaust the soil. Third, they kill both helpful and harmful pests.
Organic farming is simply farming without using any chemicals .
3 What is organic farming ?
4 . What is the main reason for using organic farming methods ?
A healthy soil reduces disease and helps crops grow strong and healthy .
Third reading ( 8ms )
Read the text again, and fill in the following forms.
2.The soil is not exhausted.
2.Peas and soybeans renew the minerals in the soil becomes rich and healthy.
3.They use the soil to best advantage.
3.They plant crops that need surface soil and next crops that grow at a deeper level. So the wind and water doesn’t carry away the soil. All the richness of the soil is used.
Advantages of organic farming
Reasons
1.This makes the soil richer in minerals and so more fertile.
1.Farmers use natural waste from animals.
What is the disadvantage of using chemical fertilizers?
1.Leaving chemicals in the ground for a long time is not good for the soil or the water supply.
2.Farmer often grow the same crop year after.As a result, the soil gets exhausted.
3.Chemical fertilizers kill both helpful and harmful bacteria and pests.
Retelling ( 8ms )
Retell the text according to the chart: Organic farming
I. Crops growing with natural fertilizers.
II. Farmers prefer natural waste from animals.
Natural fertilizer
Chemical fertilizer
1.make…richer and more fertile
2.reduce…and help …strong
3.the fertilizers kill…and healthy
4.keep free…from chemicals
1.leaving…is not good
2.grow…year after year
III. Farmers change crops every two or three years.
…to make sure what is left …
Recently ,however , scientists have been finding that long-term use of these fertilizers can cause damage to the land and , even more dangerous , to people’s health
然而最近,科学家们发现长期使用化肥会给土地造成损害,甚至更危险的是会给人类的健康造成损害.
1 (1)however为副词, 意为”然而，可是 ”，表转折，可用于句首,句末,句中,如在句中,起前后都要加逗号.
例如:
He , however ,couldn’t pay for the education that young Albert needed .
然而,他无法支付小艾伯特的教育费用
(2)however为连词,引导让步状语从句,相当于no matter how ,修饰形容词或副词.
例如:
However hot it is , he will never take off his coat .
=No matter how hot it is , he will never take off his coat . 无论多么热,他都不会把外套脱掉.
However fast you run , you can’t catch up with a car .
=No matter how fast you run , you can’t catch up with a car . 无论你跑得多快,你也赶不上一辆小汽车.
2. have been finding 是现在完成进行时,现在完成进行时的特点是强调”动作的连续性”,但有可能已经终止.
例如:
He is very tired , he has been working hard all day .
他很累,他整天都在努力工作.
He has been writing a letter.
他一直在写信.
They often change the kind of crop in each field every few years ,…他们通常每隔几年就改变一块田地里作物的种类,……
every 或 “every other+时间”表示”每隔……每”,表示时间或空间的间隔. 具体用法是 : “every+基数词+复数名词”;”every +序数词+ 单数名词”.
例如:
every year 每年
every two years / every second year / every other year每两年(每隔一年)
every three years / every third year /every other two years .每三年(每隔两年)
every four years / every fourth year / every other three years 每四年(每隔三年)
Why are chemical fertilizers so popular in farming today ?
为什么花费在现在的耕作中如此受欢迎?
popular 的用法:
(1)popular 为形容词,意为”受喜爱的，受欢迎的，当红的”. 常用短语: be popular with sb 受某人欢迎. 例如:
This is one of our most popular designs .
这是我们是受欢迎的设计之一.
Skiing has become very popular recently .
滑雪运动最近盛行起来.
I’m not very popular with my parents at the moment . 眼下爸妈对我很不高兴.
(2)popular 为形容词,意为”通俗的,大众化的”.
例如:
popular music / culture / fiction
流行音乐/文化/小说
popular 为形容词,意为”(概念,信仰,意见)普遍的，大众的，流行的”. 例如:
Contrary to popular belief, women cause fewer road accidents than men .
与普遍的看法相反,妇女交通肇事比男人少.
1. What made Jia Sixie become interested in improving Chinese farming?
He saw how some farms produced good crops and healthy animals and others did not.
Reading task on Page 52 ( 15ms)
Read the passage on Page 52, then finish the exercises on Page 53.
2. How did he think he could help farmers?
He thought that when he found the best agricultural methods he would write them down so all farmers could read about them and benefit.
Advice for farmers
Keeping seeds
Choosing seeds to plant
hang seed-heads up to dry all winter, knock seeds out when they are sown
choose ones with the best colour
3. What advice did he give farmers? Make notes in the chart.
Advice for farmers
Way to get rid of weeds(1)
Way to get rid of weeds(2)
let animals eat them before planting
turn the soil over and cover the weeds so they die.
Advice for farmers
Autumn planting
Spring ploughing
Crops
deep ploughing
less deep ploughing
change crops grown in the same field every year.
Unit 2 Using language
Chemical or organic farming?
First reading ( 3ms )
Read the passage , then find out the main idea of each paragraph.
Para 1:
Para 2:
Para 3:
Para 4:
Long-term use of fertilizers can cause damage to the land and people ‘s health.
The problem caused by chemical fertilizers .
Some farmers and many customers are beginning to turn to organic farming.
Organic farmers also use many other methods to keep the soil fertile.
Second reading ( 5ms )
Read the text again and answer the following questions:
1 Why are chemical fertilizers so popular in farming today?
2 What problems can be caused by using chemical fertilizers ?
3 What is organic farming ?
4 What is the main reason for using organic farming methods ?
1.Why are chemical fertilizers so popular in farming today ?
They can stop crop disease and increase production.
2 What problems can be caused by chemical fertilizers ?
There are three problems. First, chemical fertilizers affect the soil and the water supply badly. Second, they allow farmers to grow the same crop year after year and exhaust the soil. Third, they kill both helpful and harmful pests.
Organic farming is simply farming without using any chemicals .
3 What is organic farming ?
4 . What is the main reason for using organic farming methods ?
A healthy soil reduces disease and helps crops grow strong and healthy .
Third reading ( 8ms )
Read the text again, and fill in the following forms.
2.The soil is not exhausted.
2.Peas and soybeans renew the minerals in the soil becomes rich and healthy.
3.They use the soil to best advantage.
3.They plant crops that need surface soil and next crops that grow at a deeper level. So the wind and water doesn’t carry away the soil. All the richness of the soil is used.
Advantages of organic farming
Reasons
1.This makes the soil richer in minerals and so more fertile.
1.Farmers use natural waste from animals.
What is the disadvantage of using chemical fertilizers?
1.Leaving chemicals in the ground for a long time is not good for the soil or the water supply.
2.Farmer often grow the same crop year after.As a result, the soil gets exhausted.
3.Chemical fertilizers kill both helpful and harmful bacteria and pests.
Retelling ( 8ms )
Retell the text according to the chart: Organic farming
I. Crops growing with natural fertilizers.
II. Farmers prefer natural waste from animals.
Natural fertilizer
Chemical fertilizer
1.make…richer and more fertile
2.reduce…and help …strong
3.the fertilizers kill…and healthy
4.keep free…from chemicals
1.leaving…is not good
2.grow…year after year
III. Farmers change crops every two or three years.
…to make sure what is left …
Recently ,however , scientists have been finding that long-term use of these fertilizers can cause damage to the land and , even more dangerous , to people’s health
然而最近,科学家们发现长期使用化肥会给土地造成损害,甚至更危险的是会给人类的健康造成损害.
1 (1)however为副词, 意为”然而，可是 ”，表转折，可用于句首,句末,句中,如在句中,起前后都要加逗号.
例如:
He , however ,couldn’t pay for the education that young Albert needed .
然而,他无法支付小艾伯特的教育费用
(2)however为连词,引导让步状语从句,相当于no matter how ,修饰形容词或副词.
例如:
However hot it is , he will never take off his coat .
=No matter how hot it is , he will never take off his coat . 无论多么热,他都不会把外套脱掉.
However fast you run , you can’t catch up with a car .
=No matter how fast you run , you can’t catch up with a car . 无论你跑得多快,你也赶不上一辆小汽车.
2. have been finding 是现在完成进行时,现在完成进行时的特点是强调”动作的连续性”,但有可能已经终止.
例如:
He is very tired , he has been working hard all day .
他很累,他整天都在努力工作.
He has been writing a letter.
他一直在写信.
They often change the kind of crop in each field every few years ,…他们通常每隔几年就改变一块田地里作物的种类,……
every 或 “every other+时间”表示”每隔……每”,表示时间或空间的间隔. 具体用法是 : “every+基数词+复数名词”;”every +序数词+ 单数名词”.
例如:
every year 每年
every two years / every second year / every other year每两年(每隔一年)
every three years / every third year /every other two years .每三年(每隔两年)
every four years / every fourth year / every other three years 每四年(每隔三年)
Why are chemical fertilizers so popular in farming today ?
为什么花费在现在的耕作中如此受欢迎?
popular 的用法:
(1)popular 为形容词,意为”受喜爱的，受欢迎的，当红的”. 常用短语: be popular with sb 受某人欢迎. 例如:
This is one of our most popular designs .
这是我们是受欢迎的设计之一.
Skiing has become very popular recently .
滑雪运动最近盛行起来.
I’m not very popular with my parents at the moment . 眼下爸妈对我很不高兴.
(2)popular 为形容词,意为”通俗的,大众化的”.
例如:
popular music / culture / fiction
流行音乐/文化/小说
popular 为形容词,意为”(概念,信仰,意见)普遍的，大众的，流行的”. 例如:
Contrary to popular belief, women cause fewer road accidents than men .
与普遍的看法相反,妇女交通肇事比男人少.
1. What made Jia Sixie become interested in improving Chinese farming?
He saw how some farms produced good crops and healthy animals and others did not.
Reading task on Page 52 ( 15ms)
Read the passage on Page 52, then finish the exercises on Page 53.
2. How did he think he could help farmers?
He thought that when he found the best agricultural methods he would write them down so all farmers could read about them and benefit.
Advice for farmers
Keeping seeds
Choosing seeds to plant
hang seed-heads up to dry all winter, knock seeds out when they are sown
choose ones with the best colour
3. What advice did he give farmers? Make notes in the chart.
Advice for farmers
Way to get rid of weeds(1)
Way to get rid of weeds(2)
let animals eat them before planting
turn the soil over and cover the weeds so they die.
Advice for farmers
Autumn planting
Spring ploughing
Crops
deep ploughing
less deep ploughing
change crops grown in the same field every year.
First reading ( 3ms )
Read the passage , then find out the main idea of each paragraph.
Para 1:
Para 2:
Para 3:
Para 4:
Long-term use of fertilizers can cause damage to the land and people’s health.
The problem caused by chemical fertilizers .
What is organic farming.
The methods of organic farming.
Second reading ( 5ms )
Read the text again and answer the following questions:
1 Why are chemical fertilizers so popular in farming today?
2 What problems can be caused by using chemical fertilizers ?
3 What is organic farming ?
4 What is the main reason for using organic farming methods ?