北师大版（2019）高中英语选择性必修第一册 Unit3 Lesson 1 The Sixth Extinction课件 （35张)

(共35张PPT)
Lesson 1 The sixth extinction
新北师大选择性必修Book 1
Unit 3 CONSERVATION
Learning objectives
1.Analyse the structure of the passage.
2.Know about the background information of the extinctions in the history.
3. Acquire and sort out the cause, effects and solutions of the sixth extinction.
die out
species
﹡wipe
wipe out
unusual
mass
varied
﹡asteroid
decrease
消失；绝迹，灭绝
n. 物种，种
vt. 擦；拭
彻底毁灭
adj. 异常的；不平常的
adj. 大量的
adj. 各种各样的，形形色色的
n. 小行星
vi.&vt. 减少
n. 减少；减少的量
Read aand speak out the Chinese immediately.
blame
be to blame
affect
be at risk
endangered
solar
hatch
restore
vt. 责怪，指责
把……归咎于
vt. 影响
处境危险，受到威胁
adj. 濒危的
adj. 太阳光（能）的
vi.&vt. （使）孵化
vt. （使）恢复
Conservation
Unit 3
Lesson 1
The Sixth Extinction
a situation in which sth. no longer exists 灭绝
1. How many times up to today has life on Earth
almost died out
a. Once. b. Five times. c. More than 10 times.
2. About what percent of all species on Earth became
extinct during the mass extinction known as the
“Great Dying”
a. Less than 10%. b. Nearly 50%.
c. More than 90%.
3. What do scientists think will cause the next mass
extinction
a. Human activity. b. Natural causes.
c. Unknown reasons.
Task 1
How much do you know about extinction
background history
solutions
effects
causes / reasons
The
Sixth
Extinction
Task 2
Scanning for structure
Read the plete the notes. Then talk about the different aspects of extinctions.
Task 3
Meaning of extinction ______________________
___________
The number of extinctions that have occurred so far ______________
______________
Two notable extinctions and their consequences
______________
______________
Main reasons that cause extinctions
___________
___________
How to avoid the sixth mass extinction
________________________
Extinction
Check your answers.
Meaning of extinction ________________________
____________
The number of extinctions that have occurred so far ___________________
___________________
Extinction
entire species are wiped out
over 90% of all species that ever lived
Two notable extinctions and their consequences
____________________________________________________________________________________
____________________________________________________________________________________
· the third mass extinction, killed 90% to 96% of
all species;
· the fifth event, which occurred 66 million years
ago, caused the death of the dinosaurs
Main reasons that cause extinctions
__________________________________________________________________________________________
______________________________________________________________________________________________________________________________
· volcanic eruptions;
· asteroids hitting the
Earth from space;
· changes in sea levels;
· the decrease of
oxygen content of
the sea;
· global warming
How to avoid the sixth mass extinction
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
· change the way we live,
including setting up
special areas where
plants and animals can
be protected;
· change how we work and
travel by using cleaner,
more natural sources of
energy;
· improve our farming
methods
Task 4
Read again. Answer the questions.
1. What did scientists find out in 2015
2. Why does the writer think the sixth mass
extinction will come
3. Why does the writer believe we'll probably die
out if 75% of the Earth's species die out
4. What did people do in the case study to protect
black robins Which claim(s) did the case study
support in the text
Check your answers.
1. What did scientists find out in 2015
The study found that how quickly species die out due to natural causes, that is, the “background extinction rate”. They found that human activity is causing species to die out 1,000 times faster than normal.
2. Why does the writer think the sixth mass
extinction will come
Because human activity has negatively affected all other species on Earth, including animals and pants.
3. Why does the writer believe we'll probably
die out if 75% of the Earth's species die out
Because our world and our lives depend on the balance in nature between animals and plants.
4. What did people do in the case study to protect
black robins Which claim(s) did the case study
support in the text
(1)· People protected Old Blue's
eggs, helped them to hatch,
and took care of the chicks.
· People are restoring their
habitats and removing pests
like mice and cats from the
islands where they live.
(2)· The case study showed that
even in desperate situations,
we can do something to help.
In short, it's never too late.
Do you know any endangered species
What should we do to help them
Can you create some slogans to protect species from extinction
Do you know any endangered species
What should we do to help them
South China Tiger
Yangtze River Dolphin
Tibetan Antelope
· Protect wildlife habitat.
· Recycle and buy sustainable products.
· Never purchase products made from threatened
or endangered species.
· …
Save animals, they will save you.
Animals are your neighbours on this earth.
Respect them.
Animals gone, Trees gone, Humans gone...
Shoot me with camera, don't shoot me
with gun.
Can you create some slogans to protect species from extinction
...
1.Write a short passage to introduce the sixth extinction according to the mindmap.
2.Underline the difficult language points in the passage.
3.Finish exercise 6 and 7 of this part.
Lesson 1 The sixth extinction
新北师大选择性必修Book 1
Unit 3 CONSERVATION
Learning objectives
1. Analyse the writing features of the text.
2.Learn some language points.
Use the adjectives and nouns to make meaningful expressions.
Then use each expression to make a sentence.
Write the sentences in the space provided.
P54 6
entire
endangered
significant
natural
mass
solar
change
resource
extinction
species
energy
animal
____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
____________________________________________________________________________________________________
1. Each time it drained (流光), it
caused entire species of sea
plants and creatures to die off.
2. The original research was
about the origin of a kind of
endangered animal.
3. I think that's quite a
significant change.
4. Soil water is an important natural resource.
5. This is the story of wildlife conservation in the age of
mass extinction.
6. Solar energy is a new kind of source of energy.
Task 1
Complete the paragraph about extinctions using the correct form of the phrases below.
die out be known as have affected depend on wipe out take steps take action set up take care of
In the last 500 million years, there have been five mass extinction events on Earth. In the third event, which 1.___________ the “Great Dying”, 90% to 96% of all species 2._______. Of course, species died out due to many causes. But nowadays, human activity 3.___________ all types of species that we 4._________ for living. We need to 5.__________ to avoid the sixth mass extinction. We should 6._________ to save endangered animals and plants, and 7.______ special areas to 8.___________ them before the next extinction comes that may 9._________ the entire species.
is known as
died out
has affected
depend on
take action
take steps
set up
take care of
wipe out
Task 2
Think and share.
1. Use different coloured pens to highlight at least
one example for each of the four elements listed
below in different colours.
· facts · reasons · opinions / predictions · solutions
1. In fact, over 90% of all species that ever lived are now extinct.
2. Many scientists say we are now entering the Earth’s sixth mass extinction.
fact
opinion
Task 3
facts:
In the last 500 million years, there have been five times when life on Earth has almost ended.
The “Great Dying” killed 90% to 96% of all species.
The fifth event, which occurred 66 million years ago, caused the death of the dinosaurs.
Human activity is causing species to die out 1, 000 times faster than normal.
numbers
Focus on writing features
opinions / predictions:
Many scientists say we are now entering the Earth’s sixth mass extinction.
Scientists believe that up to three quarters of all species on Earth could die out.
say, believe, think, in one’s opinion…
Focus on writing features
reasons:
There is a long list of reasons why so many species are dying out: air and water pollution, forests being destroyed, factory farming and overfishing.
Without forests, we would have no air to breathe and without clean water we would be unable to survive.
reason, as, without sth / sb, would…, cause, because, due to, since, for…
Focus on writing features
solutions:
We need to take steps to save endangered species, including setting up special areas where plants and
animals can be protected.
We need to change how we work and travel…
We also need to improve our farming methods.
need to do, should do…
Focus on writing features
Writing methods
Writing purpose
citing ideas from experts or authorities
giving examples
using data
to explain what the sixth extinction is and its effects
to call on people to take action to prevent it from happening
Focus on writing features
2. What ways of argument does the writer use to
convince readers Are you convinced Why or
why not
· The writer uses ways such as citing ideas from
experts or authorities, giving examples and
using data.
· I believe that if we take action now it is not too
late to save other species from extinction. The
black robin was saved from extinction when
only five birds remained, so I think it is
possible to save any species if we act right now.
numbers
facts
scientists /
experts say
reason, as…
we need to
solutions
reasons
opinions /
predictions
exposition
The
Sixth
Extinction
Focus on writing features
define v. 给…下定义；标明…界限
refer to 参考；涉及；指的是
1. Extinctions, where entire species are wiped out, are not unusual in our
Earth's history.
2. These include the third mass extinction, known as the "Great Dying", which
killed 90% to 96% of all species.
3. A 2015 study by scientists who were based at Brown University and
Duke University in the US, looked at how quickly species die out
due to natural causes
4. If a sixth mass extinction occurs, seientists who have studied the issue
believe that up to three quarters of all species on Earth could die out.
5. We need to take steps to save endangered species, including
setting up special areas where plants and animals can be protected.
Which of the clauses above:
(1) give information to identify the persons/objects. ( ) )
(2) give extra information about a person or a thing, which can
be left out. ( )
3,4,5
1,2
( ) 1. He went to a city where iron was produced in huge quantities.
( ) 2. The bus which was full of tourists stopped near the Leaning Tower of Pisa.
( ) 3. Melissa lent me some money, which was very generous of her.
( ) 4. The ground is covered with snow and ice, which makes driving
very dangerous.
( ) 5. I met the famous professor in the hotel, where the meeting was held.
D
D
ND
ND
ND
1. Finish the exercises No.1 on P136 of exercise book, No.4 on P69,No.4 on P89 of textbook.
2. Preview Lesson3 and note down the new words and phrases.