资源简介

(共47张PPT)
Unit 1
Nature in the balance
Welcome to the unit & Reading
1. Understand the significance of the Amazon rainforest;
2. Develop the awareness of protecting the Earth’s ecosystem;
3. Improve reading skills;
4. Learn some important sentences.
Lead-in
Listen to the song The Earth is our only home and discuss the following questions in pairs.
How to understand “harm” and “alarm” in this song
What is the message of the song
The Earth is our only home
The human race has done much harm.
We have polluted our soils and seas,
And cut down too many 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 clean;
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.
pollute soils
pollute seas
cut down too many trees
1. (1) Can you list “harm” that the song has expressed
(2) How to understand “harm” in this song
“Harm” means something bad we have done to the Earth, including polluting soils and seas, cutting down too many trees, etc.
2. (1) Can you list “alarm” that the song has expressed
(2) How to understand “alarm” in this song
Be thankful for the skies;
Plant new trees;
Stop pollution;
Find the solution.
“Alarm” means the signal that warns us of the dangers of environmental damage, which urges us to find a solution to this problem.
By the end of the class, we should be able to:
know the basic information about the Amazon rainforest;
evaluate the importance of the Amazon rainforest;
raise the awareness of protecting environment;
Learning Objectives
Lead-in
What plants or animals do you know about What is special about them
sloths
giant redwoods
树懒熊
巨杉
Actually, all of them live in the Amazon rainforest.
How much do you know about the Amazon rainforest
Background Information
The Amazon rainforest:
a natural treasure
Self-study
1.agriculture ______________
2.impact __________
3.thus __________
4.due to __________
5.variety__________
6.survive __________
农业、农学
影响，作用
因此，从而
由于，因为
不同种类；变化，多样性
生存，存活
在...下面，在...下方
使分解为，使变化成
7.beneath________________
8.break down__________
What will be talked about in the article based on the title and the picture
Pre-Reading
Para. 1: to the Amazon rainforest
Para. 2: information about the rainforest
Para. 3:
Para. 4:
Para. 5:
biodiversity; of the rainforest
biodiversity; chain;
The rainforest’s to the human race;
to the rainforest
Read quickly and complete the main idea of each paragraph.
Skimming:
Introduction
Basic
Plant
levels
Animal
food
value
threats
Analysing the structure
Plant biodiversity
Different levels
Value
Threat
Animal biodiversity
Food chain
Introduction
Basic information
2. What’s the structure of the passage
Part 1: Para. 1　Part 2: Paras. 2－5
3. What’s the main idea of the passage
A. The Amazon rainforest is the largest rainforest in the world.
B. The Amazon rainforest gives the richest biodiversity on the Earth.
C. The Amazon rainforest is a natural treasure house on the Earth.
D. The Amazon rainforest is known as the “lungs of the planet”.
√
While-reading:
Para. 1 Read and complete the blanks
Introduction
As the largest rainforest in the world, it plays a __________ role in maintaining the fine balance of the Earth‘s .
significant
ecosysterm
1. What’s the function of Paragraph 1
A. To emphasize the importance of the Amazon rainforest.
B. To explain why the Amazon rainforest is a natural treasure.
C. To state the status of the Amazon rainforest: the largest rainforest.
D. To lead into the following paragraphs.
Careful-reading
Paragraph 1
√
Para. 2 Read carefully and fill in the blanks
eight countries
6 million
6,400 km
biodiversity
Para. 3 Read and complete the mind map
a system of roots
the mass of leaf litter
shorter plants with large leaves
towering ancient hardwoods
the tops of the
tallest trees
The forest’s different levels support an unbelievable variety of wildlife.
brazil nut
water lily
Paragraph 3
1. How does the author develop this paragraph
A. By listing numbers. B. By giving examples.
C. By making comparisons. D. Both A & B.
√
Para. 4 listen and finish the food chain.
01
02
03
04
05
1. ___________
2. ___________
3. ___________
4. ___________
5. ___________
Jaguars
frogs and other species
insects
leaves and
fruit
micro-organisms
Para. 5 Read and fill in gaps
Significance:
It is often known as the ______________________.
Present situation:
___ per cent of the rainforest has disappeared ______human activities.
“lungs of the planet”
17
due to
2.What rhetorical device is used in this paragraph
A. Metaphor(隐喻)．
B. Personification(拟人)．
C. Parallelism(排比)．
√
3. What is the function of the question at the end of the passage
A. To introduce the topic.
B. To introduce ways to protect the Amazon rainforest.
C. To seek for answers to protect the Amazon rainforest.
D. To arouse people’s concern about the Amazon rainforest.
√
4. What is the purpose of this documentary script
A. To advertise the Amazon rainforest.
B. To popularize(科普) the Amazon rainforest.
C. To persuade readers to protect wildlife.
D. To call for our joint efforts to protect the Amazon rainforest.
√
Summary
Amazon rainforest
Basic information
location and size
Name: getting its name from (1) ________________
richest (2) ____________
Plants
more than 40,000 (3) ______________
different (4) _____ of the forest
Animals
more than 1,300 species of birds and over 400 species of (5) __________
elements of this forest’s (6) ___________
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
Read and complete the chart
6,400
6 million
8
17%
20%
400
40,000
1,300
What is the purpose of using so many figures
to support the statement;
to make it more persuasive and convincing;
Thinking
1. What type of writing is the passage
A. Narrative writing.
B. Exposition.
C. Argumentation.
D. Practical writing.
Further reading
Features of an expository text：
Use of literary resources
Organization of information
Accuracy of language
√
2. What skills does this documentary script use to make it clear and understandable
By presenting facts.
By listing numbers.
By making comparisons.
By giving examples.
By using metaphors.
What can we do to protect the Amazon rainforest
Post-reading
return farmland to forests
prohibit the cutting of trees
reduce carbon emissions
take public transportation
reduce human activities
Ant Forest Programme
Choose the best answer according to the text.
1. Why is the Amazon rainforest very important to the Earth
A. It is the largest rainforest in the world.
B. It helps maintain the fine balance of the Earth's ecosystem.
C. It is home to a variety of plants and animals.
D. It breathes life into the planet by fixing carbon.
2. What helps break down a jaguar's body after its death
A. A number of microorganisms.
B. The nutrients of the earth.
C. A variety of insects.
D. A kind of frog.
Practice
3. Which is one major danger to species in the Amazon rainforest
A. Agriculture. B. Cattle farming.
C. Human activities. D. Carbon and oxygen.
4. What is the text mainly about
A. The significance of agriculture.
B. The value of the Amazon rainforest.
C. The way to enjoy the natural treasure.
D. The remark on the Amazon rainforest.
C
D
Read the text and choose the best answer:
A
B
B
A
C
B
A
D
Langauage points
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.
一片绿色的海洋
处处可闻各种动物的声音
在……方面起着重要作用
Analyze the key points of the text
Para. 1
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.
“介词＋which”引导的非限制性定语从句，修饰先行词 the Amazon River
独立主格结构作状语
在长度上
Para. 2
Of the 390,000 plant species known to us, more than 40,000 can be found in the Amazon. This tall and ancient brazil nut tree produces nuts that we can eat; these water lilies are big enough to lie down on. The forest’s different levels support an unbelievable variety of wildlife. At the bottom, there is a system of roots beneath the ground. Above that is the mass of leaf litter on the dark forest floor. The next level is made up of shorter plants with large leaves.
睡莲
各种各样的
表示地点、方位等的介词短语置于句首引起的全部倒装结构
Para. 3
Then there are the towering ancient hardwoods, and finally the tops of the tallest trees many metres above the ground. Each level of the forest forms its own little world, home to different kinds of living things.
高耸的；卓越的
阔叶树；硬材(阔叶树的木材)
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引导让步状语从句，意为“虽然，尽管”
以……为食
相应地，转而
大批；大群
使分解(为)，使变化(成)
Para. 4
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.
by doing 方式状语
定语从句
Para. 5
Over the past 50 years, about 17 per cent of the rainforest has disappeared due to human activities such as agriculture and cattle 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”
as引导时间状语从句，意为“随着……”
“over/in/during/for the past/last＋时间段”与现在完成时连用

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