人教版高中英语必修4 Unit2 Unit 2 Working the land Using language reading 课件（共42张PPT）
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| 名称 | 人教版高中英语必修4 Unit2 Unit 2 Working the land Using language reading 课件（共42张PPT） |
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| 格式 | zip | ||
| 文件大小 | 1.7MB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 人教版（新课程标准） | ||
| 科目 | 英语 | ||
| 更新时间 | 2016-01-31 00:00:00 | ||
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课件42张PPT。Unit2 Working the land
Using language ——readingchemical
production
bacteria
pest
nutrition
mineral
discoveryadj. 化学的; 关于化学的
n. 生产; 制造
n. 细菌
n. 害虫; 害兽; 害鸟
n. 营养; 滋养; 食物
n. 矿物; 矿石
n. 发现; 发觉focus
soil
reduce
root
skim
underline
summary
commentn. 焦点; 中心点
vt. 集中; 聚焦
n. 土壤
vt. 减少; 减缩
n. 根; 根源
vt. 浏览; 略读
vt. 画底线标出; 强调
n. 总结; 摘要; 概要
n. 评论; 议论
vi.& vt. 表达意见;
做出评论 build up
lead to
focus on
keep… free
from/of逐渐增强; 建立; 开发
导致; 造成 (后果)
集中 (注意力, 精力等) 于
使…免受(影响, 伤害等)；
使…不含(有害物)It is fertilizer. What is the substance we put on the
soil to make crops grow?How many kinds of fertilizers do farmers use?
There are two kinds. They are chemical
fertilizers and natural ones. Organic Farmingchemical fertilizer cow dung用化学肥料和有机肥料的区别:ReadingCHEMICAL OR ORGANIC FARMING?Chemical fertilizers can cause many
problems, so organic farming is
becoming more popular. Organic
farming means growing crops with
natural fertilizer. The organic
farmers keep the soil rich and healthy. The main idea of the text:Fast ReadingLong-term use of chemical fertilizers can
cause damage to the land and people’s health.Problems caused by chemical fertilizers.The main idea of each paragraphP1.P2.Farmers and customers turn to organic
farming.Other methods to keep the soil fertile. P3.P4.Chemical fertilizer Not good for the soil or the water supplyThe soil gets exhausted.Kill both helpful and harmful bacteria and pestsCareful ReadingChemical farmingstop crop
disease
increase
productiondamage the
landby killing…affect cropsby staying…lead to cancer
/illnessesby building up…have less
nutritionby growing
too fastOrganic farming Natural waste from animalsMake the soil richer in minerals and
more fertileA healthy soilReduce diseases in cropsHelp crops grow strong and healthyOrganic farminguse natural wastemake the soil rich
in mineralschange the cropput minerals back
into soil, making…plant crops with
different rootsuse different levels
of land plant grass between cropsprevent…from…,
a natural fertilizerOther methods: Change crops
every two or three yearsCorn, wheatPeas, soybeansPut the minerals back into the soil, making it rich and healthyCrops that use the surface of the soil (peanuts)Crops that need a deeper level of soil (root vegetable)Make sure that what is left in the ground after
harvesting becomes a natural fertilizer for the
next year’s crop1. Which statement is WRONG
according to the text?
A. All crops are organic.
B. Recently, the term “organic farming”
has gained another meaning.
C. All farmers use fertilizers.
D. Scientists believe some chemical
fertilizers are better for people.Choose the best answer. D2. Which is not the reason why organic
farmers prefer natural waste from
animals?
A. It can keep the food free from
chemicals.
B. It can keep the air, soil and water
free from chemicals.
C. It can kill harmful pests.
D. It can make the soil richer in
mineral.C3. What is the advantage of using
chemical fertilizers?
A. Leaving chemicals in the ground
for a long time is good for water supply.
B. They can get the soil exhausted.
C. They can kill helpful bacteria.
D. They can kill harmful pest. D 4. The organic farmers do the followings
except ______.
A. adding fertilizers which is rich in mineral
B. changing crops every two or three years
C. planting seeds in different layers of the soil
D. planting grass between crops to prevent
the soil from being blown awayA 1. What is “organic farming”? Answer the questions.It refers to crops growing with natural rather than chemical fertilizers.2. What do organic farmers prefer to
use as fertilizer? The fertilizer that organic farmers prefer is natural waste from animals.Farmers grow peas or soybeans after
corn or wheat so that peas and beans
can put minerals back into the soil,
making it rich and healthy and ready
to grow more wheat or corn.3. Why do organic farmers grow peas or soybeans after corn or wheat?4. What is the advantage of using natural
fertilizer? Make the soil richer in minerals and so more fertile. Reduce diseases in crops and help them grow strong and healthy. Besides, keep the air, soil and water as well as the food supply free from chemical.They are a great way to stop crop disease and increase production.5. Why are chemical fertilizers so
popular in farming today?6. What problems are caused by using
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. 7. What is the main reason for using
organic farming methods?The main reason for using organic
farming methods is to grow good food
and to avoid damaging the environment
or people’s health. Fill in the chart.Farmers often
change the kind of
crop in each field
every few years.Changing the crops
renews the minerals in
the soil and helps it
become rich and healthy.This uses different
levels of soil.This prevents wind
or water from
carrying away soil
and acts as a natural
fertilizer. It is important to explain this again or
we will confuse the students.
confuse 动词, 表示“把(某人)弄糊涂;
使迷惑”, “搞乱; 混淆”。如:
They asked me so many questions that
they confused me.
他们问我那么多问题把我都弄糊涂了。Language PointsMy Chinese and English books are
confused together.
我的中英文的书籍混在一起了。
He was confused by a strange idea.
他被奇怪的念头弄糊涂了。
Please don’t confuse Australia with
Austria. 别把澳大利亚和奥地利混淆了。【拓展】
confusion n. 混乱; 慌乱; 混淆
confusing和confused辨析:
这两个词都是由confuse转化而来的形容词。
confusing意思是“莫名其妙的; 难以理解的
(difficult to understand; puzzling)”,
强调事物本身所具有的性质;
confused意思是“糊涂的; 迷乱的(unable to
think clearly)”, 强调人对某事物的感受。2. His father says that he has never regretted
sending his son to study abroad. (Page 13)
regret在句中作动词, 意为“为……感到遗憾;
后悔; 惋惜”。如：
I didn’t regret the choice I had made.
我做了这个选择并不后悔。
I regret to say that we can’t stay here any longer.
我很遗憾, 我们不能再在这儿多呆了。
She regretted having missed the film.
她懊悔没能看上那场电影。 【拓展】
1) regret还可用作名词, 意为“遗憾; 后悔”。
I felt a great regret at having spent my time
in this way. 我对这样浪费光阴深感懊悔。
2) regret to do sth 表示“遗憾地要……”，
后面的动词常是say, tell, speak, inform等;
regret doing sth 表示“后悔做过……”;
to one’s regret 令人遗憾的是3. These chemicals in the food supply
build up in people’s bodies over time.
build up ?增强; 建立; 开发
Hard working conditions build up
character.
艰苦的工作条件能磨练人的性格。4. Many of these chemicals can lead to
cancer or other illnesses.
lead to: 导致; 造成
Too much work and too little rest
often lead to illness.?
过量的工作和过少的休息会引起疾病。
All roads lead to Rome.?
条条大道通罗马。5. They focus on keeping their soil rich
and free of disease.
focus on: 集中(注意力, 精力等)于
You should focus your attention on
your work.
把注意力集中在你的工作上。
Olympus: Focus on life.
奥林巴斯: 瞄准生活。6. reduce v. 减少, 降低
e.g. 公司尽力通过减少花销来提高利润。
The company tries to increase profits by
_______________ .
今年我们已经减少了业务开支。
We ______________ expenses this year. reducing costshave reduced7. This also keeps the air, soil, water and
crops free from chemicals.
keeps… free from /of: 使……免受
(影响, 伤害等); 使不含(有害物)
We put our books in bookcase to keep
them free from dust.
You must take care to keep the wound
free from the dirt.【拓展】
1)keep … from: 隐瞒, 不把……告诉(某人)
阻止, 避免” 如：
He won’t be able to keep the truth from his
father.
You can’t keep him from doing that thing.
2)free from: 使解除, 使摆脱 如：
They aim to free the students from too
much homework.
3)be free of sb/sth: 摆脱某人/某物
I’m free of that job at last.Expressions 1. 化肥
2. 对…造成损害
3. 洗掉某物
4. 导致; 造成(后果); 通往
5. 逐渐增强, 建立
6. 另外(还有)
7. 使…免受(影响);
8. 集中(注意力、精力)于
9. 每隔几年
10. 避免做…chemical fertilizers
cause/do damage to
wash off
lead to
bulid up
in addition (to)
keep…free from/of
focus on
every few years
avoid doingExercises cause/do damage to, wash off, lead to, bulid up,
in addition(to), keep…free from/of, focus on,
avoid doing1. His mistakes ______ his failure.
2. These chemicals in the food supply________
in people’s bodies over time.
3. All roads _______ Rome.
4. Please _____ your mind ___ the following
problem.
5. Children should ________________ violence.led tobulid upfocusonlead tobe kept free from6. He likes basketball. ___________, he likes
football. He likes basketball _____________
football.
7. Little Tom stuck to ________ the mud ____
his shoes by himself before he came in.
8. I tried to ______________ (meet) him because
he always bores me.
9. The storm on May 3 ___________ great
__________ people in Burma so far.cause/do damage to, wash off, lead to, bulid up,
in addition(to), keep…free from/of, focus on,
avoid doingIn additionin addition to washingoffavoid meetinghas causeddamage to
Using language ——readingchemical
production
bacteria
pest
nutrition
mineral
discoveryadj. 化学的; 关于化学的
n. 生产; 制造
n. 细菌
n. 害虫; 害兽; 害鸟
n. 营养; 滋养; 食物
n. 矿物; 矿石
n. 发现; 发觉focus
soil
reduce
root
skim
underline
summary
commentn. 焦点; 中心点
vt. 集中; 聚焦
n. 土壤
vt. 减少; 减缩
n. 根; 根源
vt. 浏览; 略读
vt. 画底线标出; 强调
n. 总结; 摘要; 概要
n. 评论; 议论
vi.& vt. 表达意见;
做出评论 build up
lead to
focus on
keep… free
from/of逐渐增强; 建立; 开发
导致; 造成 (后果)
集中 (注意力, 精力等) 于
使…免受(影响, 伤害等)；
使…不含(有害物)It is fertilizer. What is the substance we put on the
soil to make crops grow?How many kinds of fertilizers do farmers use?
There are two kinds. They are chemical
fertilizers and natural ones. Organic Farmingchemical fertilizer cow dung用化学肥料和有机肥料的区别:ReadingCHEMICAL OR ORGANIC FARMING?Chemical fertilizers can cause many
problems, so organic farming is
becoming more popular. Organic
farming means growing crops with
natural fertilizer. The organic
farmers keep the soil rich and healthy. The main idea of the text:Fast ReadingLong-term use of chemical fertilizers can
cause damage to the land and people’s health.Problems caused by chemical fertilizers.The main idea of each paragraphP1.P2.Farmers and customers turn to organic
farming.Other methods to keep the soil fertile. P3.P4.Chemical fertilizer Not good for the soil or the water supplyThe soil gets exhausted.Kill both helpful and harmful bacteria and pestsCareful ReadingChemical farmingstop crop
disease
increase
productiondamage the
landby killing…affect cropsby staying…lead to cancer
/illnessesby building up…have less
nutritionby growing
too fastOrganic farming Natural waste from animalsMake the soil richer in minerals and
more fertileA healthy soilReduce diseases in cropsHelp crops grow strong and healthyOrganic farminguse natural wastemake the soil rich
in mineralschange the cropput minerals back
into soil, making…plant crops with
different rootsuse different levels
of land plant grass between cropsprevent…from…,
a natural fertilizerOther methods: Change crops
every two or three yearsCorn, wheatPeas, soybeansPut the minerals back into the soil, making it rich and healthyCrops that use the surface of the soil (peanuts)Crops that need a deeper level of soil (root vegetable)Make sure that what is left in the ground after
harvesting becomes a natural fertilizer for the
next year’s crop1. Which statement is WRONG
according to the text?
A. All crops are organic.
B. Recently, the term “organic farming”
has gained another meaning.
C. All farmers use fertilizers.
D. Scientists believe some chemical
fertilizers are better for people.Choose the best answer. D2. Which is not the reason why organic
farmers prefer natural waste from
animals?
A. It can keep the food free from
chemicals.
B. It can keep the air, soil and water
free from chemicals.
C. It can kill harmful pests.
D. It can make the soil richer in
mineral.C3. What is the advantage of using
chemical fertilizers?
A. Leaving chemicals in the ground
for a long time is good for water supply.
B. They can get the soil exhausted.
C. They can kill helpful bacteria.
D. They can kill harmful pest. D 4. The organic farmers do the followings
except ______.
A. adding fertilizers which is rich in mineral
B. changing crops every two or three years
C. planting seeds in different layers of the soil
D. planting grass between crops to prevent
the soil from being blown awayA 1. What is “organic farming”? Answer the questions.It refers to crops growing with natural rather than chemical fertilizers.2. What do organic farmers prefer to
use as fertilizer? The fertilizer that organic farmers prefer is natural waste from animals.Farmers grow peas or soybeans after
corn or wheat so that peas and beans
can put minerals back into the soil,
making it rich and healthy and ready
to grow more wheat or corn.3. Why do organic farmers grow peas or soybeans after corn or wheat?4. What is the advantage of using natural
fertilizer? Make the soil richer in minerals and so more fertile. Reduce diseases in crops and help them grow strong and healthy. Besides, keep the air, soil and water as well as the food supply free from chemical.They are a great way to stop crop disease and increase production.5. Why are chemical fertilizers so
popular in farming today?6. What problems are caused by using
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. 7. What is the main reason for using
organic farming methods?The main reason for using organic
farming methods is to grow good food
and to avoid damaging the environment
or people’s health. Fill in the chart.Farmers often
change the kind of
crop in each field
every few years.Changing the crops
renews the minerals in
the soil and helps it
become rich and healthy.This uses different
levels of soil.This prevents wind
or water from
carrying away soil
and acts as a natural
fertilizer. It is important to explain this again or
we will confuse the students.
confuse 动词, 表示“把(某人)弄糊涂;
使迷惑”, “搞乱; 混淆”。如:
They asked me so many questions that
they confused me.
他们问我那么多问题把我都弄糊涂了。Language PointsMy Chinese and English books are
confused together.
我的中英文的书籍混在一起了。
He was confused by a strange idea.
他被奇怪的念头弄糊涂了。
Please don’t confuse Australia with
Austria. 别把澳大利亚和奥地利混淆了。【拓展】
confusion n. 混乱; 慌乱; 混淆
confusing和confused辨析:
这两个词都是由confuse转化而来的形容词。
confusing意思是“莫名其妙的; 难以理解的
(difficult to understand; puzzling)”,
强调事物本身所具有的性质;
confused意思是“糊涂的; 迷乱的(unable to
think clearly)”, 强调人对某事物的感受。2. His father says that he has never regretted
sending his son to study abroad. (Page 13)
regret在句中作动词, 意为“为……感到遗憾;
后悔; 惋惜”。如：
I didn’t regret the choice I had made.
我做了这个选择并不后悔。
I regret to say that we can’t stay here any longer.
我很遗憾, 我们不能再在这儿多呆了。
She regretted having missed the film.
她懊悔没能看上那场电影。 【拓展】
1) regret还可用作名词, 意为“遗憾; 后悔”。
I felt a great regret at having spent my time
in this way. 我对这样浪费光阴深感懊悔。
2) regret to do sth 表示“遗憾地要……”，
后面的动词常是say, tell, speak, inform等;
regret doing sth 表示“后悔做过……”;
to one’s regret 令人遗憾的是3. These chemicals in the food supply
build up in people’s bodies over time.
build up ?增强; 建立; 开发
Hard working conditions build up
character.
艰苦的工作条件能磨练人的性格。4. Many of these chemicals can lead to
cancer or other illnesses.
lead to: 导致; 造成
Too much work and too little rest
often lead to illness.?
过量的工作和过少的休息会引起疾病。
All roads lead to Rome.?
条条大道通罗马。5. They focus on keeping their soil rich
and free of disease.
focus on: 集中(注意力, 精力等)于
You should focus your attention on
your work.
把注意力集中在你的工作上。
Olympus: Focus on life.
奥林巴斯: 瞄准生活。6. reduce v. 减少, 降低
e.g. 公司尽力通过减少花销来提高利润。
The company tries to increase profits by
_______________ .
今年我们已经减少了业务开支。
We ______________ expenses this year. reducing costshave reduced7. This also keeps the air, soil, water and
crops free from chemicals.
keeps… free from /of: 使……免受
(影响, 伤害等); 使不含(有害物)
We put our books in bookcase to keep
them free from dust.
You must take care to keep the wound
free from the dirt.【拓展】
1)keep … from: 隐瞒, 不把……告诉(某人)
阻止, 避免” 如：
He won’t be able to keep the truth from his
father.
You can’t keep him from doing that thing.
2)free from: 使解除, 使摆脱 如：
They aim to free the students from too
much homework.
3)be free of sb/sth: 摆脱某人/某物
I’m free of that job at last.Expressions 1. 化肥
2. 对…造成损害
3. 洗掉某物
4. 导致; 造成(后果); 通往
5. 逐渐增强, 建立
6. 另外(还有)
7. 使…免受(影响);
8. 集中(注意力、精力)于
9. 每隔几年
10. 避免做…chemical fertilizers
cause/do damage to
wash off
lead to
bulid up
in addition (to)
keep…free from/of
focus on
every few years
avoid doingExercises cause/do damage to, wash off, lead to, bulid up,
in addition(to), keep…free from/of, focus on,
avoid doing1. His mistakes ______ his failure.
2. These chemicals in the food supply________
in people’s bodies over time.
3. All roads _______ Rome.
4. Please _____ your mind ___ the following
problem.
5. Children should ________________ violence.led tobulid upfocusonlead tobe kept free from6. He likes basketball. ___________, he likes
football. He likes basketball _____________
football.
7. Little Tom stuck to ________ the mud ____
his shoes by himself before he came in.
8. I tried to ______________ (meet) him because
he always bores me.
9. The storm on May 3 ___________ great
__________ people in Burma so far.cause/do damage to, wash off, lead to, bulid up,
in addition(to), keep…free from/of, focus on,
avoid doingIn additionin addition to washingoffavoid meetinghas causeddamage to
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