外研版（2019）选修 第二册Unit 5 A delicate world Staring out & Understanding ideas课件(共38张PPT 内嵌视频)
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| 名称 | 外研版（2019）选修 第二册Unit 5 A delicate world Staring out & Understanding ideas课件(共38张PPT 内嵌视频) |  | |
| 格式 | pptx | ||
| 文件大小 | 46.4MB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 外研版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2023-10-26 16:41:26 | ||
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(共38张PPT)
Unit 5
A delicate world
Starting out
The environment where different types of plants, animals and species live
Different kinds of animals and plants in a balanced environment
Ecosystem
Biodiversity
Match the definitions（定义）with the terms (术语)
生态系统
生物多样性
The _______ (more/less) different kinds of living things in the ____________, the more successful it is.
more
ecosystem
Biodiversity
Ecosystem
Non-living things
Living things
Biodiversity
determine
influence
Complete the mindmap
All the living things on the Earth live in ________
What are they on Earth
ecosystems
We can think of an ecosystem as this wooden puzzle game
Ecosystems are a little bit like this game of sticks(游戏棒)
Which figure of speech(修辞手法) is used here
类比
We can think of an ecosystem as this wooden puzzle game
Ecosystems are a little bit like this game of sticks(游戏棒)
What does the writer suggest
The things that live in ecosystems ____________ each other. They are ________
depend on
connected
The whole thing represents an ____________The woods stand for ________ including _________who fit all together and __________ each other to live. If a species go ________, it you disappear from the ecosystem. Losing few of them __________cause too much trouble.
ecosystem
species
humans
depend on
extinct
will not
But losing too many will make the ____________rickety(摇晃的).Humans have to manage the ecosystem extremely ___________. If not, it will _____and there won’t be any place for human beings
ecosystem
carefully
fall
Satellite Images of Aral Sea, Central Asia
What is happening to the area according to the satellite images
Aral Sea is becoming _________ and _________
smaller
smaller
Satellite Images of Aral Sea, Central Asia
2. What do you think a later satellite image would show
3. What do you think caused these changes
Global Warming
air pollution
deforestation
desertification
Understanding ideas
Activity 1 Watch the video and answer the questions.
1. Are humans part of Earth’s ecosystems Why
2. In what ways can humans affect ecosystems
1. Are humans part of Earth’s ecosystms Why
Yes, because all living things live in ecosystems and humans are living things.
2. In what ways can humans affect ecosystems
Humans affect ecosystems in positive and negative ways. On one hand, they plant trees, raise, protect animals, and recycle things, but on the other, deforestation, air and water pollution and excessive waste from humans harm ecosystems.
1 What animals can you see in the picture
Birds and penguin /'pe gw n/.
2 What kind of changes would take place if human arrived on the island
native vegetation the local ecological balance unknown problems
Activity 2
vegetation: plants in general in a place
Look at the title and predict the main idea of the passage.
MACQUARIE ISLAND:
from Chaos to Conservation
/'ke s/ n.
a state of complete confusion and lack of order
混乱；紊乱
/k ns 've n/ n.
the protection of the natural environment
（对自然环境的）保护
[m 'kw ri]
Read for main idea
What’s the main idea of the passage And what about the writing purpose
How Macquarie Island was saved from destruction.
Read for structure
Divide the passage into several parts and find out the main idea of each part.
Part 1
Part 2
Part 3
Para. 1
Para. 2-5
Para. 6
An introduction to the island
The tragic story of the native species
The programme to recover the ecology
How would you describe the current Macquarie Island
“a wild and natural beauty”
“surprising (UNESCO World Heritage Site)”
“harmony”
What happened to the island
Read for details
Organise information from the passage and complete the flow chart.
Activity 4
Time
1810
After 1810
1810-1891
In the 1970s
In the 1980s
At present
Read for details
Activity 4
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.
Read for details
Activity 4
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.
Think & share
1.What does this cause and effect(因果) tell us
How human interference led to such severe consequences for Macquarie island.
Think & share
2 What is your understanding of “… we humans owe it to the island to give it a happy ending”
Since it is we humans that are to blame for the ecological problem with the island, we must shoulder the responsibility to make efforts to recover the ecology of it.
Strong winds and stormy seas have helped sculpt its long, thin shape.
强风和汹涌的海浪雕刻/塑造了它细长的形状。
The green grass and bare rock of its landscape contrast ___________ (drama), ______ (give) it a wild and natural beauty.
绿色的草地和光秃秃的岩石形成了鲜明的对比，给了它一种野性和自然美。
No visitor would think ______ surprising ______ the island is UNESCO World Heritage Site.
没有游客会因为该岛被联合国教科文组织列为世界遗产而感到惊讶。
Language points – Para. 1
dramatically
giving
it
that
v. to give sth. a particular shape
使具有某种形状
Nor would they _________ (未能做成) imagine how its ________
___________ (当地栖居的动物), including royal penguins, king penguins, and elephant seals, existed ______________________ (与……完美和谐相处) their natural habitat for thousands of years.
他们也不会想象不到，这里的原住民，包括皇家企鹅、帝企鹅和象海豹，几千年来如何与它们的自然栖息地多么完美地和谐相处的。
Language points – Para. 1
fail to
in perfect harmony with
native
inhabitant
具有否定意义的副词放在句首时，句子要用部分倒装结构。
nor 为否定词，常见结构为：
Nor + 助动词/be动词/情态动词 + 主语 + 谓语 + 其它成分
句型变换
He didn’t quit his job, and he wasn’t fired either.
= He didn’t quit the job, and nor was he fired.
他们那时无法理解这件事，我们也理解不了。
They couldn’t understand it at the time, and nor/neither could we.
Sentence structure: nor + 部分倒装句
具有否定意义的副词：
never, seldom, little, few, rarely, nowhere, not until, hardly…when, no sooner… than, not only… but also, in no way, by no means, under no circumstances, etc.
I have never seen such a moving film.
Never before have I seen such a moving film.
We will by no means give up.
By no means will we give up.
I had hardly entered the classroom when the bell rang.
Hardly had I entered the classroom when the bell rang.
Sentence structure: nor + 部分倒装句
I failed to persuade him out of smoking.
He failed (in) the competition, feeling sad.
The examiners failed over half the candidates.
The brakes on my bike failed halfway down the hill.
Her eyesight is failing owing to using the Internet too much.
When he lost his job, he felt he had failed his family.
Words fail me to express my great gratitude.
The crops failed again last summer.
Many small companies have failed during the pandemic.
fail to do sth.
未能做成某事
不过关；不及格
判定不合格
出故障
健康衰退
使失望
无能为力
歉收
破产
Language points – Para. 2
a tragic story
arrive on the island
unknowingly
take over
subsequently
develop an appetite for…
develop a taste for…
develop an interest in…
develop a close friendship with…
develop the habit of…
develop (an) immunity to…
一个悲剧的故事
到达岛上
在不知情的情况下
接管
随后
对……产生兴趣
与……产生亲密的友谊
养成……的习惯
对……产生免疫力
Language points – Para. 3
be introduced to
a source of food
Translate: ______ (不受约束的) on the island, they did what rabbits do best – they ________________ (迅速繁殖) and began eating the native _________ (植被) and _______ (dig) holes, which caused _____________ (土壤侵蚀).
dig – dug – dug, digging
erode v. 侵蚀；腐蚀；风化
翻译：在岛上自由自在，它们做了兔子最擅长的事——它们迅速繁殖，开始吃当地的植被，挖洞，这导致了土壤侵蚀。
the exploding rabbit population
explode v. – explosion n. – explosive adj.
被介绍给
食物的来源
兔子数量激增
Loose
multiplied rapidly
vegetation
digging
soil erosion
Language points – Para. 3
provide plentiful food for
in turn
This in turn led to more cats _________ (hunt) the birds.
be native to
die out
为……提供丰富/充足的食物
反过来(as a result)；轮流
是土生土长的
消亡
hunting
Language points – Para. 4
an official nature reserve
remain out of control
feel _____ necessary to do
come up with
remove… from…
decrease from… to…
in consequence
turn one’s attention back to
官方自然保护区
保持失控状态
觉得有必要去做
想出，提出（计划、方法）
从……移除
从……减少到……
结果 = as a result/consequently
把注意力转回
it
Language points – Para. 5
While the cat’s away, the mice will play.
with the departure of
turn out
develop an immunity to
a substantial number of
Translate: This incident ________________ (使……明确/清楚) the rat, mouse and rabbit problem needed _________ (solve) _________________ .
翻译：这一事件表明，大鼠、老鼠和兔子的问题需要一劳永逸地解决。
猫儿不在，老鼠成精。
山中无老虎，猴子称大王。
随着……的离开
结果
对……产生免疫力
大量的
made it clear that
solving
once and
for all
= for good (and all)
Language points – Para. 6
tackle this very problem
the last remaining (adj.) species
Translate: We humans _________ (欠……) the island to give it a happy ending.
翻译：我们人类应该给这个岛一个美好的结局。
解决这个问题
最后存留的物种
owe it to
He owes the bank what is beyond what he can afford.
他欠银行的债务超出了他的承受能力。
我认为你得向我们道歉。
I think you owe us an apology.
他认为成功是完美合作的结果。
He owes the success to perfect collaboration.
句型 owe it to sb. to do
owe it to sb. that…
You owe it to your staff to give them better pay.
The survivors owed it to the MSF doctors that they could survive the deadly Ebola infection.
owe sb. sth. | owe sth. to sb.
应该为某人做某事
把......归功于
欠某人债务/人情；把......归功于
Language points
What expressions does the author use to describe the increase or decrease of numbers
… multiply rapidly.
the exploding rabbit population
… the number of cats increased.
… caused the population to decrease from… to…
… the numbers exploded.
… killed a substantial number of…
Unit 5
A delicate world
Starting out
The environment where different types of plants, animals and species live
Different kinds of animals and plants in a balanced environment
Ecosystem
Biodiversity
Match the definitions（定义）with the terms (术语)
生态系统
生物多样性
The _______ (more/less) different kinds of living things in the ____________, the more successful it is.
more
ecosystem
Biodiversity
Ecosystem
Non-living things
Living things
Biodiversity
determine
influence
Complete the mindmap
All the living things on the Earth live in ________
What are they on Earth
ecosystems
We can think of an ecosystem as this wooden puzzle game
Ecosystems are a little bit like this game of sticks(游戏棒)
Which figure of speech(修辞手法) is used here
类比
We can think of an ecosystem as this wooden puzzle game
Ecosystems are a little bit like this game of sticks(游戏棒)
What does the writer suggest
The things that live in ecosystems ____________ each other. They are ________
depend on
connected
The whole thing represents an ____________The woods stand for ________ including _________who fit all together and __________ each other to live. If a species go ________, it you disappear from the ecosystem. Losing few of them __________cause too much trouble.
ecosystem
species
humans
depend on
extinct
will not
But losing too many will make the ____________rickety(摇晃的).Humans have to manage the ecosystem extremely ___________. If not, it will _____and there won’t be any place for human beings
ecosystem
carefully
fall
Satellite Images of Aral Sea, Central Asia
What is happening to the area according to the satellite images
Aral Sea is becoming _________ and _________
smaller
smaller
Satellite Images of Aral Sea, Central Asia
2. What do you think a later satellite image would show
3. What do you think caused these changes
Global Warming
air pollution
deforestation
desertification
Understanding ideas
Activity 1 Watch the video and answer the questions.
1. Are humans part of Earth’s ecosystems Why
2. In what ways can humans affect ecosystems
1. Are humans part of Earth’s ecosystms Why
Yes, because all living things live in ecosystems and humans are living things.
2. In what ways can humans affect ecosystems
Humans affect ecosystems in positive and negative ways. On one hand, they plant trees, raise, protect animals, and recycle things, but on the other, deforestation, air and water pollution and excessive waste from humans harm ecosystems.
1 What animals can you see in the picture
Birds and penguin /'pe gw n/.
2 What kind of changes would take place if human arrived on the island
native vegetation the local ecological balance unknown problems
Activity 2
vegetation: plants in general in a place
Look at the title and predict the main idea of the passage.
MACQUARIE ISLAND:
from Chaos to Conservation
/'ke s/ n.
a state of complete confusion and lack of order
混乱；紊乱
/k ns 've n/ n.
the protection of the natural environment
（对自然环境的）保护
[m 'kw ri]
Read for main idea
What’s the main idea of the passage And what about the writing purpose
How Macquarie Island was saved from destruction.
Read for structure
Divide the passage into several parts and find out the main idea of each part.
Part 1
Part 2
Part 3
Para. 1
Para. 2-5
Para. 6
An introduction to the island
The tragic story of the native species
The programme to recover the ecology
How would you describe the current Macquarie Island
“a wild and natural beauty”
“surprising (UNESCO World Heritage Site)”
“harmony”
What happened to the island
Read for details
Organise information from the passage and complete the flow chart.
Activity 4
Time
1810
After 1810
1810-1891
In the 1970s
In the 1980s
At present
Read for details
Activity 4
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.
Read for details
Activity 4
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.
Think & share
1.What does this cause and effect(因果) tell us
How human interference led to such severe consequences for Macquarie island.
Think & share
2 What is your understanding of “… we humans owe it to the island to give it a happy ending”
Since it is we humans that are to blame for the ecological problem with the island, we must shoulder the responsibility to make efforts to recover the ecology of it.
Strong winds and stormy seas have helped sculpt its long, thin shape.
强风和汹涌的海浪雕刻/塑造了它细长的形状。
The green grass and bare rock of its landscape contrast ___________ (drama), ______ (give) it a wild and natural beauty.
绿色的草地和光秃秃的岩石形成了鲜明的对比，给了它一种野性和自然美。
No visitor would think ______ surprising ______ the island is UNESCO World Heritage Site.
没有游客会因为该岛被联合国教科文组织列为世界遗产而感到惊讶。
Language points – Para. 1
dramatically
giving
it
that
v. to give sth. a particular shape
使具有某种形状
Nor would they _________ (未能做成) imagine how its ________
___________ (当地栖居的动物), including royal penguins, king penguins, and elephant seals, existed ______________________ (与……完美和谐相处) their natural habitat for thousands of years.
他们也不会想象不到，这里的原住民，包括皇家企鹅、帝企鹅和象海豹，几千年来如何与它们的自然栖息地多么完美地和谐相处的。
Language points – Para. 1
fail to
in perfect harmony with
native
inhabitant
具有否定意义的副词放在句首时，句子要用部分倒装结构。
nor 为否定词，常见结构为：
Nor + 助动词/be动词/情态动词 + 主语 + 谓语 + 其它成分
句型变换
He didn’t quit his job, and he wasn’t fired either.
= He didn’t quit the job, and nor was he fired.
他们那时无法理解这件事，我们也理解不了。
They couldn’t understand it at the time, and nor/neither could we.
Sentence structure: nor + 部分倒装句
具有否定意义的副词：
never, seldom, little, few, rarely, nowhere, not until, hardly…when, no sooner… than, not only… but also, in no way, by no means, under no circumstances, etc.
I have never seen such a moving film.
Never before have I seen such a moving film.
We will by no means give up.
By no means will we give up.
I had hardly entered the classroom when the bell rang.
Hardly had I entered the classroom when the bell rang.
Sentence structure: nor + 部分倒装句
I failed to persuade him out of smoking.
He failed (in) the competition, feeling sad.
The examiners failed over half the candidates.
The brakes on my bike failed halfway down the hill.
Her eyesight is failing owing to using the Internet too much.
When he lost his job, he felt he had failed his family.
Words fail me to express my great gratitude.
The crops failed again last summer.
Many small companies have failed during the pandemic.
fail to do sth.
未能做成某事
不过关；不及格
判定不合格
出故障
健康衰退
使失望
无能为力
歉收
破产
Language points – Para. 2
a tragic story
arrive on the island
unknowingly
take over
subsequently
develop an appetite for…
develop a taste for…
develop an interest in…
develop a close friendship with…
develop the habit of…
develop (an) immunity to…
一个悲剧的故事
到达岛上
在不知情的情况下
接管
随后
对……产生兴趣
与……产生亲密的友谊
养成……的习惯
对……产生免疫力
Language points – Para. 3
be introduced to
a source of food
Translate: ______ (不受约束的) on the island, they did what rabbits do best – they ________________ (迅速繁殖) and began eating the native _________ (植被) and _______ (dig) holes, which caused _____________ (土壤侵蚀).
dig – dug – dug, digging
erode v. 侵蚀；腐蚀；风化
翻译：在岛上自由自在，它们做了兔子最擅长的事——它们迅速繁殖，开始吃当地的植被，挖洞，这导致了土壤侵蚀。
the exploding rabbit population
explode v. – explosion n. – explosive adj.
被介绍给
食物的来源
兔子数量激增
Loose
multiplied rapidly
vegetation
digging
soil erosion
Language points – Para. 3
provide plentiful food for
in turn
This in turn led to more cats _________ (hunt) the birds.
be native to
die out
为……提供丰富/充足的食物
反过来(as a result)；轮流
是土生土长的
消亡
hunting
Language points – Para. 4
an official nature reserve
remain out of control
feel _____ necessary to do
come up with
remove… from…
decrease from… to…
in consequence
turn one’s attention back to
官方自然保护区
保持失控状态
觉得有必要去做
想出，提出（计划、方法）
从……移除
从……减少到……
结果 = as a result/consequently
把注意力转回
it
Language points – Para. 5
While the cat’s away, the mice will play.
with the departure of
turn out
develop an immunity to
a substantial number of
Translate: This incident ________________ (使……明确/清楚) the rat, mouse and rabbit problem needed _________ (solve) _________________ .
翻译：这一事件表明，大鼠、老鼠和兔子的问题需要一劳永逸地解决。
猫儿不在，老鼠成精。
山中无老虎，猴子称大王。
随着……的离开
结果
对……产生免疫力
大量的
made it clear that
solving
once and
for all
= for good (and all)
Language points – Para. 6
tackle this very problem
the last remaining (adj.) species
Translate: We humans _________ (欠……) the island to give it a happy ending.
翻译：我们人类应该给这个岛一个美好的结局。
解决这个问题
最后存留的物种
owe it to
He owes the bank what is beyond what he can afford.
他欠银行的债务超出了他的承受能力。
我认为你得向我们道歉。
I think you owe us an apology.
他认为成功是完美合作的结果。
He owes the success to perfect collaboration.
句型 owe it to sb. to do
owe it to sb. that…
You owe it to your staff to give them better pay.
The survivors owed it to the MSF doctors that they could survive the deadly Ebola infection.
owe sb. sth. | owe sth. to sb.
应该为某人做某事
把......归功于
欠某人债务/人情；把......归功于
Language points
What expressions does the author use to describe the increase or decrease of numbers
… multiply rapidly.
the exploding rabbit population
… the number of cats increased.
… caused the population to decrease from… to…
… the numbers exploded.
… killed a substantial number of…