外研版（2019）选择性必修第二册Unit 5 A delicate world Starting out & Understanding ideas课件(共15张PPT)
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| 名称 | 外研版（2019）选择性必修第二册Unit 5 A delicate world Starting out & Understanding ideas课件(共15张PPT) |  | |
| 格式 | pptx | ||
| 文件大小 | 19.0MB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 外研版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2024-01-11 09:01:58 | ||
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(共15张PPT)
Unit 5 A Delicate World
Starting out
Are we humans alone on this beautiful planet
If one species go extinct, will that affect us
Absolutely!
We and other living things, such as plants, animals, insects are living on this planet together! We depend on each other to survive.
That’s how ecosystem works!
Watch the video and answer the questions.
1. Are humans part of Earth’s ecosystems
Why
2. In what ways can humans affect ecosystems
______. Humans are part of _________________. Because all the living things live in ___________ and people are ____________
Yes
ecosystems
living things
Earth’s ecosystems
Humans can affect ecosystems in __________________ ways. For example, to have a positive influence on ecosystems, people can ______________, _______________________, ____________ etc. However, ______________, __________________ and ____________ affect ecosystems in a negative way.
positive and negative
plant trees
deforestation
feed and protect animals
recycle things
air and water pollution
excessive waste
Look at the satellite images and answer the questions.
1. What is happening to the area according to the satellite images
2. What do you think a later satellite image would show
3. What do you think caused these changes
Aral Sea is becoming smaller and smaller / shrinking.
A smaller one.
Maybe it would not be able to show anything.
Climate change,
Environmental pollution,
People’s activities …
Unit 5 A Delicate World
Understanding idea
Animals in the pictures
birds
penguins
What kind of changes would take place if cats, rats and rabbits were introduced to an environment like this
They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance.
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, non-native 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.
Look through the passage, divide it into three parts, and get the main idea of each part.
Part 1 Para _____ the b_______ of the island
Part 2 Paras _____ the c_______ of the island
Part 3 Paras _____ the c______________ of the island
1
eauty
2-3
haos
4-6
onservation
Macquarie Island:
from Chaos to Conservation
From what aspects does the writer introduce the island in para.1
L________
S________
L________
I________
ocation
hape
nhabitants
andscape
In the ________________ ocean , ________ between Australia and Antarctic.
South-west Pacific
halfway
long and thin
Why
Strong winds and stormy seas sculpted its shape.
Green grass; bare rock; a wild and natural beauty
royal penguins ; king penguins; elephant seals
Organise information from the passage and complete the flow chart.
eating the birds’ eggs and attacking baby birds
they took over the island,
Cats were brought to the island.
in 1810
The cats developed an appetite for the birds.
Rabbits were introduced to the island.
To provide food for humans.
more rabbits means more 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.
in 1970s
in 1980s
in 2000
The rabbit population exploded once again.
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.
What do you think is to blame for the chaos in Macquarie Island
Deeper thinking
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 its ecology.
1. fail to do sth ____________
2. in harmony with ____________
3. develop an appetite for ____________
4. be introduced to ____________
5. soil erosion ____________
6. out of control ____________
7. remove… from ____________
8. decrease from … to ____________
9. in consequence ____________
10. turn out ____________
11. a substantial number of ____________
12. once and for all ____________
13. every last ____________
14. owe it to sb to do sth ____________
未能做成某事
与…和谐
从…移走/去除
失控
土壤侵蚀
对…产生兴趣
被引入…
从…减少到…
结果；因此
每一个
彻底地；一劳永逸地
结果是，证明是
大量的
没有绿色，生命就没有希望。
Without green, life has no hope.
(认为)应该为某人做某事
Nor would they fail to imagine how its native inhabitants, including royal penguins, king penguins, and elephant seals, existed in perfect harmony with their natural habitat for thousands of years.
★ 本句为__________结构。句子中nor 为______词，置于句首。
结构：____________________________________________________________。
部分倒装
否定
Nor + 助动词 / be 动词 / 情态动词 + 主语 + 谓语 + 其它成分
1. 他没有辞职，也没有被解雇。
2. 他们那时无法理解这件事，我们也理解不了。
He didn’t quit his job, nor was he fired.
They couldn’t understand it at that time, and nor could we.
否定意义的副词放在句首时，句子要用部分倒装。类似副词和短语还有：
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.
1) Never before have I seen such a moving film.
2) By no means will we give up.
3) Hardly had I entered the classroom when the bell rang.
2. Loose on the island, they did what rabbits do best – they multiplied rapidly
and began eating the native vegetation and digging holes, which caused soil
erosion.
★ Loose on the island 是形容词（短语）作___语。
用法：其逻辑主语为句子的主语，是由主语相同的两个句子改写而成的。
状
1) We reached the top of the mountain. We were tired and hungry.
改写：_______________________________________________ .
2) Jane was satisfied with it. She bought the book immediately.
改写：____________________________________________ .
We reached the top of the mountain, tired and hungry
Satisfied with it, Jane bought the book immediately
3. This in turn led to more cats hunting the birds.
★ in turn “依次；轮流”。还可以表示结果，相当于as a result，和下文中的
in consequence 同义。
▲ 他已超过了年龄限制，因此他的申请被拒绝了。
He was over the age limit and in turn, his application was rejected.
4. This intervention is a long, much-delayed ending to a sad story, but
we humans owe it to the island to give it a happy ending.
★ owe it to sb to do sth 应该为某人做某事
1) 我们应该为这些英雄建一座纪念碑。
2) 我们应该为孩子们治理环境。
We owe it to the heroes to build a memorial.
We owe it to our children to clean up the environment.
Write a short passage about how human interference led to great changes in your hometown.
Homework
Unit 5 A Delicate World
Starting out
Are we humans alone on this beautiful planet
If one species go extinct, will that affect us
Absolutely!
We and other living things, such as plants, animals, insects are living on this planet together! We depend on each other to survive.
That’s how ecosystem works!
Watch the video and answer the questions.
1. Are humans part of Earth’s ecosystems
Why
2. In what ways can humans affect ecosystems
______. Humans are part of _________________. Because all the living things live in ___________ and people are ____________
Yes
ecosystems
living things
Earth’s ecosystems
Humans can affect ecosystems in __________________ ways. For example, to have a positive influence on ecosystems, people can ______________, _______________________, ____________ etc. However, ______________, __________________ and ____________ affect ecosystems in a negative way.
positive and negative
plant trees
deforestation
feed and protect animals
recycle things
air and water pollution
excessive waste
Look at the satellite images and answer the questions.
1. What is happening to the area according to the satellite images
2. What do you think a later satellite image would show
3. What do you think caused these changes
Aral Sea is becoming smaller and smaller / shrinking.
A smaller one.
Maybe it would not be able to show anything.
Climate change,
Environmental pollution,
People’s activities …
Unit 5 A Delicate World
Understanding idea
Animals in the pictures
birds
penguins
What kind of changes would take place if cats, rats and rabbits were introduced to an environment like this
They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance.
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, non-native 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.
Look through the passage, divide it into three parts, and get the main idea of each part.
Part 1 Para _____ the b_______ of the island
Part 2 Paras _____ the c_______ of the island
Part 3 Paras _____ the c______________ of the island
1
eauty
2-3
haos
4-6
onservation
Macquarie Island:
from Chaos to Conservation
From what aspects does the writer introduce the island in para.1
L________
S________
L________
I________
ocation
hape
nhabitants
andscape
In the ________________ ocean , ________ between Australia and Antarctic.
South-west Pacific
halfway
long and thin
Why
Strong winds and stormy seas sculpted its shape.
Green grass; bare rock; a wild and natural beauty
royal penguins ; king penguins; elephant seals
Organise information from the passage and complete the flow chart.
eating the birds’ eggs and attacking baby birds
they took over the island,
Cats were brought to the island.
in 1810
The cats developed an appetite for the birds.
Rabbits were introduced to the island.
To provide food for humans.
more rabbits means more 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.
in 1970s
in 1980s
in 2000
The rabbit population exploded once again.
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.
What do you think is to blame for the chaos in Macquarie Island
Deeper thinking
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 its ecology.
1. fail to do sth ____________
2. in harmony with ____________
3. develop an appetite for ____________
4. be introduced to ____________
5. soil erosion ____________
6. out of control ____________
7. remove… from ____________
8. decrease from … to ____________
9. in consequence ____________
10. turn out ____________
11. a substantial number of ____________
12. once and for all ____________
13. every last ____________
14. owe it to sb to do sth ____________
未能做成某事
与…和谐
从…移走/去除
失控
土壤侵蚀
对…产生兴趣
被引入…
从…减少到…
结果；因此
每一个
彻底地；一劳永逸地
结果是，证明是
大量的
没有绿色，生命就没有希望。
Without green, life has no hope.
(认为)应该为某人做某事
Nor would they fail to imagine how its native inhabitants, including royal penguins, king penguins, and elephant seals, existed in perfect harmony with their natural habitat for thousands of years.
★ 本句为__________结构。句子中nor 为______词，置于句首。
结构：____________________________________________________________。
部分倒装
否定
Nor + 助动词 / be 动词 / 情态动词 + 主语 + 谓语 + 其它成分
1. 他没有辞职，也没有被解雇。
2. 他们那时无法理解这件事，我们也理解不了。
He didn’t quit his job, nor was he fired.
They couldn’t understand it at that time, and nor could we.
否定意义的副词放在句首时，句子要用部分倒装。类似副词和短语还有：
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.
1) Never before have I seen such a moving film.
2) By no means will we give up.
3) Hardly had I entered the classroom when the bell rang.
2. Loose on the island, they did what rabbits do best – they multiplied rapidly
and began eating the native vegetation and digging holes, which caused soil
erosion.
★ Loose on the island 是形容词（短语）作___语。
用法：其逻辑主语为句子的主语，是由主语相同的两个句子改写而成的。
状
1) We reached the top of the mountain. We were tired and hungry.
改写：_______________________________________________ .
2) Jane was satisfied with it. She bought the book immediately.
改写：____________________________________________ .
We reached the top of the mountain, tired and hungry
Satisfied with it, Jane bought the book immediately
3. This in turn led to more cats hunting the birds.
★ in turn “依次；轮流”。还可以表示结果，相当于as a result，和下文中的
in consequence 同义。
▲ 他已超过了年龄限制，因此他的申请被拒绝了。
He was over the age limit and in turn, his application was rejected.
4. This intervention is a long, much-delayed ending to a sad story, but
we humans owe it to the island to give it a happy ending.
★ owe it to sb to do sth 应该为某人做某事
1) 我们应该为这些英雄建一座纪念碑。
2) 我们应该为孩子们治理环境。
We owe it to the heroes to build a memorial.
We owe it to our children to clean up the environment.
Write a short passage about how human interference led to great changes in your hometown.
Homework