外研版（2019）选择性必修 第二册 Unit 5 A delicate world Undersdanding ideas课件（共36张，内嵌视频）
文档属性
| 名称 | 外研版（2019）选择性必修 第二册 Unit 5 A delicate world Undersdanding ideas课件（共36张，内嵌视频） |  | |
| 格式 | pptx | ||
| 文件大小 | 89.0MB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 外研版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2024-10-26 18:13:00 | ||
图片预览
文档简介
(共36张PPT)
Unit 5
A delicate world
Watch the video and answer the questions.
Watch the video and answer the questions.
1 Are humans part of Earth’s ecosystems Why
2 In what ways can humans affect ecosystems
Yes. Humans are part of Earth's ecosystems.
Because all living things live in ecosystems and people are living things.
Positive: people can plant trees, feed and protect animals, recycle things and so on.
Negative: The air and water pollution and excessive waste.
Look at the satellite images and add some information of Aral Sea.
1 What is happening to the area according to the satellite images
Aral Sea is becoming smaller and smaller/shrinking.
2 What do you think a later satellite image would
show
3 What do you think caused these changes
Look at the picture and answer the questions.
1 What animals can you see in the picture
2 What kind of changes would take place if cats, rats and rabbits were introduced to an environment like this
Penguins and bird.
They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance.
Predict the main idea of the text according to the picture and the title.
Read the passage and find out what happened to Macquarie Island.
Watch the video and learn more about macquarie island.
Macquarie Island
Vocabulary
1. chaos
rcause chaos 导致混乱
in chaos 处于混乱之中
leconomic/political/domestic chaos 经济/政治/国内的混乱
Heavy snow has caused total chaos on the roads.
大雪导致道路上一片混乱。
练习：地震后这座城市陷入了一片混乱。
__________________________________________________________
The city was in chaos after the earthquake.
Vocabulary
2. appetite
haveagood/poor/no appetite 胃口好/胃口不好/没有胃口
develop an appetite for... 对…产生食欲
give sb.an appetite 使某人胃口大开
loss of appetite 食欲不振
have an appetite for... 渴望…(appetite 前可用形容词修饰)
Lhave no appetite for... 不喜欢…
练习：
The young man has no appetite ____________ meat because he has eaten too muc
recently.
for
Vocabulary
3. multiply
(使)繁殖
These creatures can multiply quickly.这些生物能迅速大量繁殖。
成倍增加,迅速增加
>The amount of information available has multiplied.可获得的信息大大增加了。
乘，乘以
Multiply 5 and 6 ( together) and you get 30. 5乘以6等于 30。
练习：吸烟大大增加了患心脏病和其他疾病的风险。
Smoking ____________ the risk of heart attacks and other health problems.
multiplies
Vocabulary
4. reserve
reserve sth.for sb. 为某人预订某物
reserve sth.for sb. 为某人保留某物
reservation n.[C]预订,预约;保留地;[C,U]保留意见
make areservation 预订,预约
without reservation 毫无保留地
练习：我以琼斯的名字预订了一个房间。
I've ___________ a room in the name of Jones.
reserved
Vocabulary
5. out of control
control n.[U,C]管理,管制;[U]管理权,控制权 v.指挥,控制
(in control(of sth.) 掌管(某物/事),控制(某物/事)
in the control of... 受……控制
lose control of... 失去对……的控制
beyond one'scontrol 某人无法掌握,某人无法控制
be under control 被控制住,处于控制之下
bring/keep/get sth.under control 控制得住,抑制得住(从而不造成损害)
练习：一辆卡车在山上失去了控制。
A truck ran _________________ on the hill
out of control
Vocabulary
6. decrease
decrease by… 减少了……(表示减少的量)
decrease(fom...)to... (从……)减少到…(表示减少后的量)
decrease in.. 在……方面减少
a decrease in... 在…方面减少
on the decrease 在减少
inerease to.. 增加到……(表示增加后的量)
increase by…. 增加了…(表示增加的盘)
lon the increase 在增加
练习：失业青年人数已经有所下降。
The demand for corn is __________________ each year in this country.
on the decrease
Vocabulary
7. departure
departure fom...从……离开
arrivals and departures 到站和离站班次
the departure time/gate 离站时间;登机(或上车)口
the departures board 离站时刻牌
depart v. 离开,离去,起程,出发
练习：
All the __________________ ( depart ) have been canceled due to the heavy snow.
departures
Read the passage and find out what happened to Macquarie Island.
Non-native species introduced to Macquarie Island attacked native birds, and led to a substantial reduction of bird population and even the extinction of parakeets. In addition, nonnative species ate and devastated the native vegetation. All of this played a part in upsetting the natural harmony of the island.But now the island's ecology is on the road to recovery with human efforts.
The rabbit problem resulted in parakeets' dying out.
The rat, mouse and rabbit problem made people realise that problems should be solved once and for all.
I participated in a programme to tackle this very problem.
Native inhabitants on Macquarie Island were once in perfect harmony with their natural habitat.
People released a virus to kill rabbits and used traps and dogs to catch the cats.
Rats and mice brought to the island caused harm.
Match the paragraphs with the main ideas.
para. 1
para. 2
para. 3
para. 4
para. 5
para. 6
Read the passage quickly and answer the following
questions.
① Why is Macquarie Island a UNESCO World HeritageSite
A. Because it is halfway between Australia and Antarctica.
B. Because it is in the South-west Pacific Ocean.
C. Because many visitors like to go there.
D. Because there are many precious native inhabitants.
Read the passage quickly and answer the following
questions.
②What is the purpose of the island's introduction of cats
A. To kill rats and mice.
B. To take over the island.
C. To be food for the birds.
D. To bring the island colourful.
Read the passage quickly and answer the following
questions.
③ What was the cause of the parakeets‘ dying out
A. Their number was too large.
B. The rabbits liked to eat them.
C. Too many cats hunted the parakeets.
D. The parakeets were eaten up by visitors.
Read the passage quickly and answer the following
questions.
④ When did the island have no cats
A. in the 1970s.
B. In the 1980s.
C. in 2000.
D.In 2006.
Read the passage quickly and answer the following
questions.
⑤ Where does this passage probably come from
A. A TV interview.
B. A biologic report.
C. A food advertisement.
D. A book review..
Choose the author’s purpose in writing the passage and give your reasons.
1 To analyse how Macquarie Island was saved from destruction.
2 To inform readers of the chaos caused on Macquarie Island by humans.
3 To entertain readers with a funny story about what happened on Macquarie Island.
4 To suggest ways in which an ecosystem can be protected.
Organise information from the passage and complete the flow chart.
1810
After 1810
1810-1891
In the 1970s
In the 1980s
At present
Cats were brought to the island.
Rabbits were introduced to the island.
To provide food for humans.
they took over the island, eating the birds’ eggs and attacking baby birds
The cats developed an appetite for the birds.
the exploding rabbit population provided plentiful food for the cats. More cats hunted the birds and parakeets died out.
A virus was released onto the island.
Traps and dogs were used.
Poison and dogs were used.
To remove all the rabbits from the island.
To catch the cats.
To remove all the remaining invading species.
The island is pest-free and its ecology is on the road to recovery.
Substantial reduction of rabbit population led to cats killing more native birds.
The population of rats and mice increased. And the rabbit population exploded once again.
The end result was that parakeets, once large in number and native to the island,died out in 1891.
that引导表语从句,
that 引导表语从句时,只起连接作用,既不充当句子成分,本身也没有词义。
The good news is that there're really only three kinds of decisions you need to make about the colour in your home.
好消息是,关于你家里的颜色,你只需要作三种决定。
Nor would they fail to imagine how its native inhabitants... existed in perfect harmony with their natural habitat for thousands of years.
否定词（组）置于句首引起的部分倒装
在否定句中如果要强调该句中的否定概念时，可以将否定词提前放在句首，这时句子的结构要发生部分倒装的转变，即将句中原来谓语动词中的助动词、情态动词或连系动词be放在该句主语的前面。
本句中的否定词Nor与所在课文中上一句的No遥相呼应，表示“也不……”，并且其位置位于本句句首，故将谓语动词中的情态动词would提至主语前，形成部分倒装。
另外nor还常用于日常会话当中，表示前面所陈述的事实也适合于另一主语，意为“……也不”，也可以用neither。如果表达肯定概念，即“……也是”，则用so。这两种用法皆使用部分倒装，如：
—I have never seen so beautiful a place.我从未见过如此美丽的地方。
—Neither/Nor have I.我也没有。
—I will stay here without going anywhere.我会待在这里哪儿也不去。
—So will I.我也是。
rarely, hardly, seldom, never, barely, little, few等一系列能够表示否定意义或半否定意义的副词，及具有否定含义的介词短语on no account, in no case, in no way, by no means, under no circumstances等。
Seldom did he concentrate on anything other than study. 他儿乎不关注除学习以外的事情。
By no means should a child play with fire. 小孩决不能玩火。
Think & share
What is your understanding of “… we humans owe it to the island to give it a happy ending”
Do you think it was right to eradicate the “pests” from Macquarie Island Give your reasons.
Think & share
How could similar situations be avoided in the future
What language can you use to talk about cause and effect How would you apply it to your reading and writing
To avoid similar situations in the future, we should protect the natural ecosystem and be aware of the potential impact that human activities can have on ecosystems.
Exercise
1．A rescue worker risked his life saving two tourists who ________in the mountains for two days.
A．have been trapped B．had been trapped C．were trapping D．are trapping
2．She sliced her finger _______ when cutting vegetables.
A．in accident B．incident
C．by accident D．accident
3．The lockdown hobbled India's economy and its GDP recorded the sharpest ________ in its history.
A．motion B．dissatisfaction C．conservation D．contraction
Exercise
4．The population has reduced ______ because of the war.
A．dramatically B．objectively C．urgently D．steadily
5．The official is preparing documents for a four-nation regional meeting on elephant ________.
A．constitution B．affection C．conservation D．production
6．Two survivors were cut free after ________for twenty minutes.
A．trapped B．Trapping
C．being trapped D．to be trapped
Exercise
7．With the popularity of smart phones, people gradually lose the ________ for watching television, which makes TV a decoration of the house.
A．potential B．appetite C．tolerance D．intelligence
8．It is easy to get into the _____ of taking drugs, but it’s very difficult to get rid of it.
A．practice B．custom C．habit D．habitat
9．The hospital has purchased some new facilities to ________ the treatment for cancer patients.
A．decrease B．optimize C．mimic D．chase
10．You’d better give up smoking, for cigarette smoking the risk of cancer.
A．multiplies B．narrows C．reduces D．misses
Review the language points and complete the exercises.
Homework
See you next class!
Unit 5
A delicate world
Watch the video and answer the questions.
Watch the video and answer the questions.
1 Are humans part of Earth’s ecosystems Why
2 In what ways can humans affect ecosystems
Yes. Humans are part of Earth's ecosystems.
Because all living things live in ecosystems and people are living things.
Positive: people can plant trees, feed and protect animals, recycle things and so on.
Negative: The air and water pollution and excessive waste.
Look at the satellite images and add some information of Aral Sea.
1 What is happening to the area according to the satellite images
Aral Sea is becoming smaller and smaller/shrinking.
2 What do you think a later satellite image would
show
3 What do you think caused these changes
Look at the picture and answer the questions.
1 What animals can you see in the picture
2 What kind of changes would take place if cats, rats and rabbits were introduced to an environment like this
Penguins and bird.
They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance.
Predict the main idea of the text according to the picture and the title.
Read the passage and find out what happened to Macquarie Island.
Watch the video and learn more about macquarie island.
Macquarie Island
Vocabulary
1. chaos
rcause chaos 导致混乱
in chaos 处于混乱之中
leconomic/political/domestic chaos 经济/政治/国内的混乱
Heavy snow has caused total chaos on the roads.
大雪导致道路上一片混乱。
练习：地震后这座城市陷入了一片混乱。
__________________________________________________________
The city was in chaos after the earthquake.
Vocabulary
2. appetite
haveagood/poor/no appetite 胃口好/胃口不好/没有胃口
develop an appetite for... 对…产生食欲
give sb.an appetite 使某人胃口大开
loss of appetite 食欲不振
have an appetite for... 渴望…(appetite 前可用形容词修饰)
Lhave no appetite for... 不喜欢…
练习：
The young man has no appetite ____________ meat because he has eaten too muc
recently.
for
Vocabulary
3. multiply
(使)繁殖
These creatures can multiply quickly.这些生物能迅速大量繁殖。
成倍增加,迅速增加
>The amount of information available has multiplied.可获得的信息大大增加了。
乘，乘以
Multiply 5 and 6 ( together) and you get 30. 5乘以6等于 30。
练习：吸烟大大增加了患心脏病和其他疾病的风险。
Smoking ____________ the risk of heart attacks and other health problems.
multiplies
Vocabulary
4. reserve
reserve sth.for sb. 为某人预订某物
reserve sth.for sb. 为某人保留某物
reservation n.[C]预订,预约;保留地;[C,U]保留意见
make areservation 预订,预约
without reservation 毫无保留地
练习：我以琼斯的名字预订了一个房间。
I've ___________ a room in the name of Jones.
reserved
Vocabulary
5. out of control
control n.[U,C]管理,管制;[U]管理权,控制权 v.指挥,控制
(in control(of sth.) 掌管(某物/事),控制(某物/事)
in the control of... 受……控制
lose control of... 失去对……的控制
beyond one'scontrol 某人无法掌握,某人无法控制
be under control 被控制住,处于控制之下
bring/keep/get sth.under control 控制得住,抑制得住(从而不造成损害)
练习：一辆卡车在山上失去了控制。
A truck ran _________________ on the hill
out of control
Vocabulary
6. decrease
decrease by… 减少了……(表示减少的量)
decrease(fom...)to... (从……)减少到…(表示减少后的量)
decrease in.. 在……方面减少
a decrease in... 在…方面减少
on the decrease 在减少
inerease to.. 增加到……(表示增加后的量)
increase by…. 增加了…(表示增加的盘)
lon the increase 在增加
练习：失业青年人数已经有所下降。
The demand for corn is __________________ each year in this country.
on the decrease
Vocabulary
7. departure
departure fom...从……离开
arrivals and departures 到站和离站班次
the departure time/gate 离站时间;登机(或上车)口
the departures board 离站时刻牌
depart v. 离开,离去,起程,出发
练习：
All the __________________ ( depart ) have been canceled due to the heavy snow.
departures
Read the passage and find out what happened to Macquarie Island.
Non-native species introduced to Macquarie Island attacked native birds, and led to a substantial reduction of bird population and even the extinction of parakeets. In addition, nonnative species ate and devastated the native vegetation. All of this played a part in upsetting the natural harmony of the island.But now the island's ecology is on the road to recovery with human efforts.
The rabbit problem resulted in parakeets' dying out.
The rat, mouse and rabbit problem made people realise that problems should be solved once and for all.
I participated in a programme to tackle this very problem.
Native inhabitants on Macquarie Island were once in perfect harmony with their natural habitat.
People released a virus to kill rabbits and used traps and dogs to catch the cats.
Rats and mice brought to the island caused harm.
Match the paragraphs with the main ideas.
para. 1
para. 2
para. 3
para. 4
para. 5
para. 6
Read the passage quickly and answer the following
questions.
① Why is Macquarie Island a UNESCO World HeritageSite
A. Because it is halfway between Australia and Antarctica.
B. Because it is in the South-west Pacific Ocean.
C. Because many visitors like to go there.
D. Because there are many precious native inhabitants.
Read the passage quickly and answer the following
questions.
②What is the purpose of the island's introduction of cats
A. To kill rats and mice.
B. To take over the island.
C. To be food for the birds.
D. To bring the island colourful.
Read the passage quickly and answer the following
questions.
③ What was the cause of the parakeets‘ dying out
A. Their number was too large.
B. The rabbits liked to eat them.
C. Too many cats hunted the parakeets.
D. The parakeets were eaten up by visitors.
Read the passage quickly and answer the following
questions.
④ When did the island have no cats
A. in the 1970s.
B. In the 1980s.
C. in 2000.
D.In 2006.
Read the passage quickly and answer the following
questions.
⑤ Where does this passage probably come from
A. A TV interview.
B. A biologic report.
C. A food advertisement.
D. A book review..
Choose the author’s purpose in writing the passage and give your reasons.
1 To analyse how Macquarie Island was saved from destruction.
2 To inform readers of the chaos caused on Macquarie Island by humans.
3 To entertain readers with a funny story about what happened on Macquarie Island.
4 To suggest ways in which an ecosystem can be protected.
Organise information from the passage and complete the flow chart.
1810
After 1810
1810-1891
In the 1970s
In the 1980s
At present
Cats were brought to the island.
Rabbits were introduced to the island.
To provide food for humans.
they took over the island, eating the birds’ eggs and attacking baby birds
The cats developed an appetite for the birds.
the exploding rabbit population provided plentiful food for the cats. More cats hunted the birds and parakeets died out.
A virus was released onto the island.
Traps and dogs were used.
Poison and dogs were used.
To remove all the rabbits from the island.
To catch the cats.
To remove all the remaining invading species.
The island is pest-free and its ecology is on the road to recovery.
Substantial reduction of rabbit population led to cats killing more native birds.
The population of rats and mice increased. And the rabbit population exploded once again.
The end result was that parakeets, once large in number and native to the island,died out in 1891.
that引导表语从句,
that 引导表语从句时,只起连接作用,既不充当句子成分,本身也没有词义。
The good news is that there're really only three kinds of decisions you need to make about the colour in your home.
好消息是,关于你家里的颜色,你只需要作三种决定。
Nor would they fail to imagine how its native inhabitants... existed in perfect harmony with their natural habitat for thousands of years.
否定词（组）置于句首引起的部分倒装
在否定句中如果要强调该句中的否定概念时，可以将否定词提前放在句首，这时句子的结构要发生部分倒装的转变，即将句中原来谓语动词中的助动词、情态动词或连系动词be放在该句主语的前面。
本句中的否定词Nor与所在课文中上一句的No遥相呼应，表示“也不……”，并且其位置位于本句句首，故将谓语动词中的情态动词would提至主语前，形成部分倒装。
另外nor还常用于日常会话当中，表示前面所陈述的事实也适合于另一主语，意为“……也不”，也可以用neither。如果表达肯定概念，即“……也是”，则用so。这两种用法皆使用部分倒装，如：
—I have never seen so beautiful a place.我从未见过如此美丽的地方。
—Neither/Nor have I.我也没有。
—I will stay here without going anywhere.我会待在这里哪儿也不去。
—So will I.我也是。
rarely, hardly, seldom, never, barely, little, few等一系列能够表示否定意义或半否定意义的副词，及具有否定含义的介词短语on no account, in no case, in no way, by no means, under no circumstances等。
Seldom did he concentrate on anything other than study. 他儿乎不关注除学习以外的事情。
By no means should a child play with fire. 小孩决不能玩火。
Think & share
What is your understanding of “… we humans owe it to the island to give it a happy ending”
Do you think it was right to eradicate the “pests” from Macquarie Island Give your reasons.
Think & share
How could similar situations be avoided in the future
What language can you use to talk about cause and effect How would you apply it to your reading and writing
To avoid similar situations in the future, we should protect the natural ecosystem and be aware of the potential impact that human activities can have on ecosystems.
Exercise
1．A rescue worker risked his life saving two tourists who ________in the mountains for two days.
A．have been trapped B．had been trapped C．were trapping D．are trapping
2．She sliced her finger _______ when cutting vegetables.
A．in accident B．incident
C．by accident D．accident
3．The lockdown hobbled India's economy and its GDP recorded the sharpest ________ in its history.
A．motion B．dissatisfaction C．conservation D．contraction
Exercise
4．The population has reduced ______ because of the war.
A．dramatically B．objectively C．urgently D．steadily
5．The official is preparing documents for a four-nation regional meeting on elephant ________.
A．constitution B．affection C．conservation D．production
6．Two survivors were cut free after ________for twenty minutes.
A．trapped B．Trapping
C．being trapped D．to be trapped
Exercise
7．With the popularity of smart phones, people gradually lose the ________ for watching television, which makes TV a decoration of the house.
A．potential B．appetite C．tolerance D．intelligence
8．It is easy to get into the _____ of taking drugs, but it’s very difficult to get rid of it.
A．practice B．custom C．habit D．habitat
9．The hospital has purchased some new facilities to ________ the treatment for cancer patients.
A．decrease B．optimize C．mimic D．chase
10．You’d better give up smoking, for cigarette smoking the risk of cancer.
A．multiplies B．narrows C．reduces D．misses
Review the language points and complete the exercises.
Homework
See you next class!