译林版（2020）必修第三册：Unit1 Nature in the balance Welcome to the unit and Reading课件（26张）

(共26张PPT)
Welcome &Reading
Unit1 Nature in the balance
Lead-in
Listen to a song and answer the following question according to the lyrics.
The human race has done much harm.
We have polluted our soils and seas,
And cut down too much trees.
Now is the time to sound the alarm.
We want to live in a world that's clean;
We want to live in a world of green.
The human race has done much harm;
Now is the time to sound the alarm.
Let's be thankful for the skies above;
Let's plant new trees and stop pollution;
Let's work together to find the solution;
The Earth's our home to protect and love.
We want to live in a world that's claen;
We want to live in a world of green.
Let's be thankful for the skies above;
The Earth's our home to protect and love.
What’s the message of the song
We have done so much harm and we should take measures to change the situation.!
Pre-reading
Predicting :What do you think script is about from the title and pictures
The Amazon rainforest:
a natural treasure
Pre-reading
The Amazon rainforest
Predicting :What do you think the script is about from the title and pictures
amimals
significance/
value
plants
danger
location
While-reading
Skim the article and answer the follwing questions
What is the text type of the passage
A. Narration (记叙文).
B. Practical Writing(应用文).
C. Expository Writing(说明文).
D. Argumentative Essay (议论文).
explaining or providing readers with information
Para. 1
Para.2
Para.3
Para.4
Para.5
Para. 1
Para.2
Para.3
Para.4
Para.5
While-reading
Skim the article and answer the follwing questions
Para. 1
Para.2
Para.3
Para.4
Para.5
While-reading
Skim the article and find out the main idea of each part.
Introduction
Body
Summary
Introduce the topic.
Introduce basic information about the rainforest.
Wildlife in the Amazon rainforest.
The benifits/significance of the Amazon rainforest to us and threats to it.
While-reading
Skim the article and find out the main idea of each paragraph.
Introduction to the Amazon rainforest
Basic information about the rainforest.
Plant biodiversity;levels of the rainforest.
Animal biodiversity;food chain.
The rainforest’s value/benefits/significance to the human race;threats to the rainforest.
While-reading
Scan the article and fill in the blanks.
8
6 million
6,400
40,000
1,300
400
20%
17%
While-reading
Pargraph1
Pargraph2
According to the text,which of the following statements is true
A. The Amazon rainforest plays a significant role in maintaining the balance of protecting the animals’ecosystem.
B. The Amazon rainforest crosses into eight countries,which are all on the North American continent.
C. The Amazon trainforest covers an area of around 6 million square kilometers,which is more than half the size of China.
D. The Amazon rainforest, from which the river gets its name, close to 6,400kilometers in length.
While-reading
Pargraph1
Introduction
Pargraph2
location
size
name
being around 6 million square kilometers;
being more than half the size of China.
getting its name from the Amazon river
richest biodiversity
The Amazon rainforest crosses into into eight countries,including Brazil and Peru, and one overseas region of France,all on the south American continent.
While-reading
Pargraph3
Read Paragraph 3 and answer the following question.
How many plant species can be found in the Amazon rainforest
A.About 1,300. B.Over 40,000.
C.Around 400. D.About 390,000.
Pargraph3
While-reading
Read Paragraph 3 and complete the mind map about different levels of the rainforest.
supporting various wildlife
being home to diffferent kinds of living things
a system of roots （根系）
the mass of leaf litter（落叶层）
shorter plants with large leaves
towering ancient hardwoods（阔叶树）
the tops（树冠） of the tallest trees
only one element
While-reading
At least 87 species, including frogs
feed on
feed on
feed on
break down
return nutrients
feed
Pargraph4
The forest’s food chain
Complete the food chain in the rainforest.
oxygen
Significance
fix carbon and producing_______
having species used for__________
Danger
the major danger:_________
disappearing due to human activities,such as __________ and_______
food or medicine
us/human beings
agriculture
cattle farming
While-reading
Pargraph5
Read Paragraph 5 and fill in the blanks
While-reading
Pargraph5
Read Paragraph 5 and answer the following questions.
1.Why has about 17 per cent of the rainforest dissapeared over the past 50 years
A. The balance of the protecting the animals’ ecosystem dissapeared.
B. Animals were hunted and plants were damaged.
C.This forest’s food chain was damaged.
D. The impact of human activities continues to grow.
While-reading
Pargraph5
2.Where is the passage probably taken from
A.A documentary
B.A novel
C.A guidebook
D.A nwespaper
Post-reading
Retell the article.
The Amazon rainforest
1.basic information
2.plant
4.significance+danger
3.animal
location
size
name
species
levels
carbon+oxygen
food+medicine
human bings
human activities
species of birds and mammals
element of food chain
Post-reading
Summary
The Amazon rainforest, as the largest rainforest in the world,plays a significant role ______ maintaining the fine balance of the Earth’s ecosystem.
It crosses into eight countries,_________(include)Brazil and Peru,and one overseas region of France,all on the South American cintinent.With an area of around 6 million square kilometers,the Amazon rainforest is more than half ______ size of China .The Amazon River,from_______the rainforest gets its name,is lose to 6,400 kilometers in ________(long).The rivefr supports many different ecosystems.They give this area _________(rich)biodiversity on the Earth.
in
including
the
which
length
the richest
Of the 390,000 piant species_______(know) to us more than 40,000can be found in the Amazon rdainforest. The forest’s different levels support an unbelievable________(vary)of wildlife.Each level of the forest forms its own little world, home _________different kinds of living things.
Over the past 50 years,abo ut 17 per cent of theinforest ________(dissapear) due to human activities.What if these awful activities continue to grow.
known
variety
to
has disappeared
Post-reading
Critical thinking
Can we afford to damage “the lungs of the planet”
answers
function
human beings’and animals’ living conditions
nature in the balance
ecosystem
Post-reading
Free talk
How can we contribute to the conservation of rainforests and forests
The government
The people
the students
the adults
The industry
First of all,the goverment and people should combine the defiresdation of rainforests with the planting of more trees,which can guaranteen the rainforest isn’t decreasing. Second,relevant countries should adjust the economic structure so that they gd of the over-dependence on the rainforest for economic development.Third, common people should strengthen environmental awareness,so that we can realize the serious conseuences of rainforest destruction and the significance of rainforest protection.Finally,establishing nature reserves to protect rainforests is neccesary,which has been proved successful.
Possible answer
Homework
1. Find out the important phrases and difficult sentences in the article and
finish ExerciseB1 on Page5.
2.Please think of some slogans for the protection of the Amazon rainforest.
THANKS