译林版（2020） 必修第三册 Unit 1 Nature in the Balance Welcome and Reading课件（23张）

(共23张PPT)
Unit 1 Nature in the balance
Reading
Lead-in
Let us not, however, flatter ourselves overmuch on account of our human victories over nature. For each such victory nature takes its revenge on us.
—Fredrich Engels
punish someone who has made it suffer
think too highly of ourselves
Welcome to the unit
Listen to the song!
1. How do you understand “harm” and “alarm”
“Harm” means something bad we have done to the earth, including polluting soils and seas, cutting down too many trees, etc.
“Alarm” means the signal that warns us of the dangers of environmental damage, which urges us to find a solution.
2.. What is the massage of the song
Humans have done much harm to the Earth, and we have to take action to change this situation.
Pre-reading
What can you learn about the Amazon rainforest in the video
Prediction
The Amazon rainforest: a natural treasure
Predict what the article is about according to the title and pictures in the text
Fast reading
2. Read carefully to complete part A1 on page 4 with the main idea of each paragraph.
Para. 1: Introduction to the Amazon rainforest
Para. 2: Basic information about the rainforest
Para. 3: _____________________________________
Para. 4: ______________________________________
Para. 5: ________________________________________________________
Plant biodiversity：levels of the rainforest（plants）
Animal biodiversity：food chain （birds and animals）
The rainforest’s value to the human race; threats to the rainforest
1. What is the general idea of this passage
The ____________ and the _______ of the Amazon rainforest.
importance
danger
Passage Structure
Introduction
Basic information
Plant biodiversity
Different levels
Animal biodiversity
Food chain
Importance
Danger
Step 4 Reading for specific information
8
6 million
6,400
40,000
1,300
400
20%
17%
Why are so many numbers are used here
1. to provide specific and accurate information
2. to make people realize the importance of the rainforest in a direct way
offering facts
Para. 1
Read carefully and try to find the theme of this script.
While reading
Introduction
2. Who may be the target audience of this documentary How can you tell
Para. 2
1. What does “they” refer to in L10
It may target at Chinese people because the author makes comparisons with China to make the audience understand.
The Amazon rainforest is more than half the size of China.
---roughly 100 kilometers longer than the Yangze River.
It refers to the Amazon rainforest and the Amazon river.
Basic information
making comparisons
Basic information
Read para. 2
1. v___ area
2. riches b_________
ast
iodiversity
Horizontal 横向的
Read Para. 3 Plant biodiversity
water lily
brazil nut tree
(4)
(3)
(2)
(1)
a system of roots beneath the ground
the mass of leaf litter
shorter plants with large leaves
towering ancient hardwoods
the tops of the tallest trees
Read Para. 3 Plant biodiversity
Complete the mind map about different levels of the rainforest.
Vertical
纵向的
Home to different kinds of living things
Jaguars
At least 87 species, including frogs
Leaves and fruit
Microorganisms
feed on
break down
feed on
feed on
nutrient
Para. 4 Animal biodiversity & food chain
Complete the following chart about the food chain in the rainforest.
Insects
Circular循环的
giving an example
different plant levels
complicate food chains
offer places to live (habitat)
provide food and nutrients
the richest biodiversity
The reason why Amazon rainforest has the richest biodiversity in the world.
Horizontal 横向的
Vertical
纵向的
Circular循环的
How is it made clear
lungs of the planet
Para. 5 Importance & Danger
1. What is the function of the rainforest to us
fix
carbon
produce oxygen
a treasure house of species
2. What is the major threat to the rainforest
using metaphors
The Amazon rainforest breathes life into the planet by fixing carbon and
producing over 20 percent of all the Earth’s oxygen. Thus, it is often known as the “ lungs of the planet”. Moreover, the Amazon rainforest is a treasure house of species that can be used for food and medicine. Yet there is one major danger to these irreplaceable plants and animals: us.
the importance of the rainforest:
the danger of the rainforest:
Mind map
Basic information
location and size
Name: getting its name from (1) ________________
richest (2) ____________
Amazon rainforest
Animals
more than 1,300 species of birds and over 400 species of (5) __________
elements of this forest’s (6) ___________
Plants
more than 40,000 (3) ______________
different (4) _____ of the forest
Significance
fix carbon and producing (7) ________
having species used for (8) __________________
Danger
the major danger: (9) _________________
disappearing due to human activities such as (10) ____________ and cattle farming
the Amazon river
biodiversity
plant species
levels
mammals
food chain
oxygen
food or medicine
us/human beings
agriculture
1. What makes the Amazon rainforest a natural treasure according to the script
Post reading
2. What is the purpose of this docmentary
To emphasis the importance of the Amazon rainforest and call for our joint efforts to protect it.
3. What skills does this docmentary use to make it clear
facts, metaphors, examples & comparisons.
for plants
a natural treasure
for human beings
for animals
Discussion
What can we do to protect the Amazon rainforest
Homework
Write an proposal about protecting the Amazon rainforest. The following parts should be included.
Importance
Danger
Solutions
Thus, ... Moreover, ... Yet ...