北师大版（2019）选择性必修 第一册Unit 3 Conservation Lesson 1 The Sixth Extinction 课件(共15张PPT 内嵌视频)

(共15张PPT)
Unit 3 Conservation
Lesson 1
The Sixth Extinction
What is the common part about the species in the picture

Be a sharp observer.
Extinct
No longer in existence
Extinction
The Sixth
Extinctions
Meaning
Two notable
extinctions and
their consequences
Reasons
Entire species are 1._________ .
The third mass extinction (the “Great Dying”):
Killing 90% to 2. ______of all species.
The fifth event: Causing the 3._______ of the dinosaurs.
★Volcanic 4.__________.
★Asteroids 5._________the Earth from space.
★6. ________ in sea levels.
★The 7.________ of the oxygen content of the sea.
★Global 8. _________.
96%
death
hitting
warming
decrease
wiped out
eruptions
Changes
Read Para.1 to find the background information about extinctions.
Be a careful reader.
Be a careful reader.
Read para.2 and get the main reasons of the sixth mass extinction.
Main reasons of the sixth mass extinction
Air and water pollution
forests being destroyed
factory farming
overfishing.
Human activity
Be a careful reader.
Read para.3 and list
the possible consequences
of the sixth mass extinction.
up to three quarters of all species on earth could die out.
We humans would also be at risk of dying out.
Possible consequences of the sixth mass extinction
Be a careful reader.
Read para.4 and summarize the actions we can do to avoid the sixth extinction.
Actions we can do to avoid the
sixth mass extinction
save endangered species
change how we work and travel
improve our farming methods
Change the way we live
1. What is the text type of this piece of writing
A. Narration B. Description C. Exposition D. Argumentation
Be an intensive reader.
Exposition
a text explaining a process in a sequence about some facts
a text providing a comparison and contrast between two things
a text providing a classification of things
a text explaining a cause and effect relationship
a text presenting a problem and solution relationship
the sixth extinction
Para.1: The background information about extinctions.
Para.2: Main reasons of the sixth mass extinction.
Para.3: Possible consequences of the sixth mass extinction.
Para.4: Actions we can do to avoid the
sixth mass extinction.
Facts
Reasons
Predictions
Solutions
Be a skillful mindmapper
Draw a mindmap about the structure of the passage.
2. What ways can we use in exposition Find examples from the passage.
A. Citing ideas from experts or authorities
B. Giving examples
E. Using comparison and contrast
D. Referring to common knowledge
C. Using data
Be an intensive reader.
F. Giving definition
A. Citing ideas from experts or authorities
B. Giving examples
C. Using data
D. Referring to common knowledge
A
C
D
B
E. Using comparison and contrast
E
F. Giving definition
F
Be a thought-provoking thinker.
What can you see from this picture
What is our mother earth crying for
What bad things have people done for her
Discuss with your partner.
What can we do to take care of our Earth
Be an active participant.
Reduce
Reuse
Recycle
“3R”
Items check(√)
1. I know the meaning of extinction.
2. I know the structure of the text.
3. I know the text type of this passage.
4. I know the ways of exposition.
5. I think actively and answer questions bravely in this lesson.
Self-evaluation
Be a wise learner.
Homework
Write a passage titled “What can we do to survive the Sixth Great Extinction”.
Thanks for your listening!