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(共22张PPT)
译林版（2020）高中英语高一年级
必修三 Unit1 The Amazon rainforest
Nature in the balance
Reading
UNIT 1
Leading in:
What do you know about Amazon rainforest
Pre-reading:
Look at the title of the article and the picture, predict the content of the text.
Pre-reading:
What is the genre(体裁) of this passage
A. Narration
B. Argumentation
C. Description
D. Exposition
While-reading:
Complete the main idea of each para.
Para 1
Para 2
Para 3
Para 4
Para 5
Introduction to the Amazon rainforest
Basic information about the rainforest
Plant biodiversity
levels of the rainforest
Animal biodiversity
food chain
The rainforest’s value to the human
threats to the rainforest
While-reading:
Read para 1 and answer the question: what is the function of the first paragraph
Welcome to the jungle, a huge sea of green alive with the sounds of animals. This is the Amazon rainforest. As the largest rainforest in the world, it plays a significant role in maintaining the fine balance of the Earth's ecosystem.
To introduce the topic of the passage.
While-reading:
Read para 2 and finish the mind map.
The Amazon rainforest crosses into eight countries, including Brazil and Peru, and one overseas region of France, all on the South American continent. With an area of around 6 million square kilometres , the Amazon rainforest is more than half the size of China. The Amazon River, from which the rainforest gets its name, is close to 6,400 kilometres in length-roughly 100 kilometres longer than the Yangtze River. On its journey from the mountains to the ocean, the river supports many different ecosystems. They give this area the richest biodiversity on the Earth: one in ten known species in the world can be found here.
While-reading:
Read para 2, finish the mind map and answer the question.
Is _________ square kilometres
crosses into ___ countries
The Amazon River is close to _______ kilometres in length
The Amazon River supports many different __________
ecosystems
6,400
8
6 million
How does the author describe the Amazon rainforest
By listing numbers
While-reading:
Read para 3 and answer the question.
a system of ______ beneath the ground
Bottom level:
roots
shorter plants with ___________.
Next level:
Towering ________________
Next level:
the tops of the tallest trees many ______ above the ground
Top level:
large leaves
ancient hardwoods
metres
In what order is the paragraph organized
How do you know
at the bottom...
above...
the next level...
then there are...
In space order
While-reading:
Read para 4 and finish the mind map.
More than 1,300 species of birds and over 400 species of mammals hide among the jungle's plant life. This jaguar is one example. It has a yellowish-brown coat with black spots. While a significant number of jaguars survive here they are only one element of this forest's food chain. They feed on at least 87 species, including frogs. These frogs, in turn, feed on insects which eat leaves and fruit. When a jaguar dies, a tiny army of microorganisms helps break down its body and return the nutrients to the earth.
While-reading:
Read para 4 and finish the mind map.
We ______ at least 87 species, including frogs.
feed on
We ______ insects
feed on
We eat ____ and fruit
leaves
We __________ body and return the nutrients to the earth.
break down
How does the author support his topic in this paragraph
By giving examples
While-reading:
Read para 5 and finish the mind map.
The Amazon rainforest breathes life into the planet by fixing carbon and producing over 20 per cent 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 or medicine. Yet there is one major danger to these irreplaceable plants and animals: us. Over the past 50 years, about 17 per cent of the rainforest has disappeared due to human activities such as agriculture and cattie farming. As the impact of human activities continues to grow and the list of species in danger of extinction becomes longer, we are left with a question: can we afford to damage the “lungs of the planet”？
While-reading:
value
threat
fix carbon and produce over 20 per cent of all the Earth's oxygen
Has species that can be used for food or medicine
17%of the rainforest has disappeared due to human activities
the list of species in danger of extinction
Post reading:
8
6 million
6,400
17%
40,000
20%
400
1,300
Fill in the blanks with figures
8
6 million
6,400
17%
40,000
20%
400
1,300
(1)____countries and
one overseas region
around (2)________
km of forest
about (3)_________
km in length
more than (4)______ plant species
8
6 million
6,400
40,000
more than (5)______
bird species
1,300
over (6)_________
Species of mammals
over (7) ______ of all the Earth's oxygen produced
about (8)______of the rainforest Lost over the past 50 years
400
20%
17%
Post reading:
Strategies to read an exposition.
strategies to read an exposition
By listing numbers
By giving
examples
By using
space order
By making comparison
......
Critical thinking:
What should we do to protect the Earth
the society
the school
the students
the government
Sentence patterns:
We should...
It is +adj. for sb. to do sth.
Why not...
In no case should we...
Homework:
1. (Compulsory)
Writing：假如你是李华，上周六你参加了学校举行的以“保护热带雨林”为主题的创意作品大赛。请你给英国朋友Tim写一封邮件，分享这次经历。内容包括：
1） 参赛过程（包括你的参赛作品）
2） 你的感受。
2. (Optional )Are there any places in China with rich biodiversity like the Amazon rainforest What are
they Find relative information and introduce one to the class.

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