外研版（2019）选择性必修第二册Unit 5 A Delicate World Starting out & Understanding ideas 课件（共30张PPT)

(共30张PPT)
L1-2 Starting out Reading
A delicate world
easily broken or damaged
易碎的，脆弱的
Take care! Don’t break my precious and delicate china.
Activity 1 Watch the video and answer the question 1.
Are humans part of Earth’s ecosystems Why
Yes. Humans are part of Earth's ecosystems.
Because all living things live in ecosystems and people are living things.
In what ways can humans affect ecosystems
Activity 2 Watch the video again, then discuss with your groups and answer the question 2.
Positive: people can plant trees, feed and protect animals, recycle things and so on.
Negative: The air and water pollution and excessive waste.
Activity 3 Look at the satellite images and add some information of Aral Sea.
What is happening to the area according to the satellite images
Located in Central Asia, between Kazakhstam to the north and Uzbekistan to the south
The fourth largest lake (1960s)
Just four smaller lakes (NOW)
Activity 4 Discuss with your groups
What do you think a later satellite image would show Why
Activity 4 Discuss with your groups and answer the question.(5min)
What do you think caused these changes
The irrigation project
Climate change
Vegetation Damage
...
Activity 5
Look at the diagram and answer the questions. Pay attention to the expressions in bold.
absorb v 吸收；摄入
dissolved nutrients 溶解的营养物质
rely on 依靠；依赖
provide energy 提供能量
feed on 以……为食
prey on 捕食；猎获
break down 分解
release v 释放
Complete the passage
absorb
rely on
fed on
prey on
break down
release
What animals can you see in the picture
penguin
bird
king penguin
王企鹅
royal penguin
帝企鹅
loose
develop an appetite
shrimp/fish
seal
elephant seal
象海豹
exist in harmony
with their natural habitat
What kind of changes would take place if they were introduced to the environment
penguin
bird
king penguin
王企鹅
royal penguin
帝企鹅
cats
rats
rabbits
Predict based on the title
Who caused the chaos How
Who conserve what How
Read and find the answers
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.
So, I am here on Macquarie Island to participate in the programme to tackle this very problem. The first step involved poison being dropped from helicopters. The next step is to remove the last remaining invading species, and that’s where I come in – with my dogs. They have been trained to find every last one, without harming the native animals.
Poison and dogs were used.
To remove all the remaining invading species.
This island was pest-free and its ecology is on the road to recovery.
So, I am here on Macquarie Island to participate in the programme to tackle this very problem. The first step involved poison being dropped from helicopters. The next step is to remove the last remaining invading species, and that’s where I come in - with my dogs. They have been trained to find every last one, without harming the native animals. 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.
Read and Answer
Para. 6
intervention n inter- (between在中间) + ven (to come来)+ -tion (名词后缀)→来到中间→干预;介入
owe it to sb to do sth (认为)应该为某人做某事
Read for structure
Part 1 Para_____
Part 2 Paras
Part 3 Paras
the _________ of the island
the_______________ of the island
the ________________ of the island
1
beauty
2-3
chaos
4-6
conservation
Look through the passage, divide it into three parts, and get the main idea of each part.
I am standing on Macquarie Island, in the South-west Pacific Ocean, halfway between Australia and Antarctica. Strong winds and stormy seas have helped sculpt its long, thin shape. The green grass and bare rock of its landscape contrast dramatically, giving it a wild and natural beauty. No visitor would think it surprising that the island is a UNESCO World Heritage Site. 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.
How would you describe the current Macquarie Island
Read and Answer
Para. 1
World Heritage Site 世界遗产地
be in harmony with
与……和谐共处 / 协调一致
ADD YOUR TITLE HERE
Macquarie Island(麦夸里岛) Location
Shape
Landscape
Title
Inhabitants
in the ____________Pacific Ocean between ________
_______ and _______ shape caused by _______ wind and ___________
___________ and ________ contrast ___________
a _________ and ________ beauty
________ and _______ penguins, _________
and _________
Australia
Antarctica
Pacific Ocean
South-west
Australia
Antarctica
ADD YOUR TITLE HERE
Macquarie Island(麦夸里岛) Location
Shape
Landscape
Title
Inhabitants
in the ____________Pacific Ocean between ________
_______ and _______ shape caused by _______ wind and ___________
___________ and ________ contrast ___________
a _________ and ________ beauty
________ and _______ penguins, _________
and _________
South-west
Australia
Antarctica
long
thin
strong
stormy seas
ADD YOUR TITLE HERE
Macquarie Island(麦夸里岛) Location
Shape
Landscape
Title
Inhabitants
in the ____________Pacific Ocean between ________
_______ and _______ shape caused by _______ wind and ___________
___________ and ________ contrast ___________
a _________ and ________ beauty
________ and _______ penguins, _________
and _________
South-west
Australia
Antarctica
long
thin
strong
stormy seas
green grass
bare rock
dramatically
UNESCO World Heritage Site
royal
king
elephant seals
the chaos of the island
1. What was brought to the island
2. What happened after they reached the island
Read part 2(paras.2-3) and finish the following tasks.
Read part 2(paras.2-3)and finish the following tasks.
the chaos of the island
1. What was brought to the island
rats&mice
cats
rabbits
2. What happened after they reached the island
took over…
ate …
attacked …
ate birds
multiplied
ate vegetation
dig holes
soil erosion
more cats
_______ birds
fewer
____________ destruction
landscape
have a ______effect on ecology
bad
！
humans
on purpose
possible results
Humans __________ actions
careless
Read paragraph 4~ 5 and draw a mindmap to show their connections
virus
less food
kill
catch
While the cat’s away, the mice will play
immunity
kill
Poison and dogs were used.
To remove all the remaining invading species.
This island was pest-free and its ecology is on the road to recovery.
they took over the island, eating the birds’ eggs and attacking baby birds
Cats were brought to the island.
The cats developed an appetite for the birds.
Rabbits were introduced.
To provide food for humans.
more cats hunting the birds. As a result, parakeets died out.
A virus was released onto the island.
To remove all the rabbits.
Substantial reduction of rabbit population led to cats killing more native birds.
Traps and dogs were used.
To catch the cats.
The departure of the cats resulted in an increasing population of rats and mice. And the rabbit population exploded once again.
Do the purposes and results match in every single action
Human
beauty
Summary
chaos
conservation
harmony
What is your understanding of “… we humans owe it to
the island to give it a happy ending”
Think Share
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.
Important phases
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
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……
Important phases
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
从……减少到……
结果；因此
(认为)应该为某人做某事
每一个
彻底地；一劳永逸地
原来是；结果是，证明是
大量的
Homework:
Please design a poster to call on the other students to protect our living conditions. In the poster you should list some practical dos and don'ts.
Thanks for listening!