资源简介

(共30张PPT)
Unit 7 The natural world
"Hello, everyone! I am your Planet Earth. I want to tell you about my dearest friends — my ecosystems. They are like different parts of my body, helping me stay healthy and full of life. Can you name some of them
Free talk
What are the ecosystems
What type of text is the article
A.Expository (说明文)
B.Argumentative (议论文)
C.Narrative (记叙文)
Where can we read this kind of article
A. In a newspaper.
B. In a travel guide.
C. In a geography magazine.
What is the article about
T h e b i g t h r e e :
o c e a n s , w e t l a n d s a n d f o r e s t s
Read for structure
Part 1--Para.1
Part 2--
Paras.2-4
Part 2--
Paras.2-4
Part 2--
Paras.2-4
Part 3--Para.5
Read for main idea
What is an ecosystem
What are the three main ecosystems
How important are the ecosystems
Part 1--What is an ecosystem
What is an ecosystem made up of
a Oceans,wetlands and forests.
b Plants and animals.
c Living and non-living things.
Living things
Non-living things
plants
animals
….
air
water
soil
sunlight
…
different
size
role
Specific
from _____ ponds to _____
grasslands
keep the _______
between all its _______ and the greater __________.
small
large
balance
members
environment.
What are the characteristics of an ecosystem
Scan the article and finish Part A
b, d, h
c, e, i
a, f, g
Part 2--What are the three main ecosystems
size
role
cover around ______of the earth's surface
produce about _____of the earth's ________.
It’s central to ________
71%
ocean
70%
oxygen
What does it mean
_____ salt water
hold
_____ to the sky
rise
____onto the land
fall
_______ to
the ocean
return
go on and go on
water
cycle
Part 2--What are the three main ecosystems
size
role
cover around ______of the earth's surface
produce about _____of the earth's ________.
It’s central to ________
71%
ocean
70%
oxygen
water cycle
Nickname
the"______"of the earth.
heart
How is the ocean like the Earth's heart
It pumps blood throughout the body.
It delivers oxygen and nutrients to all cells.
It removes waste.(like carbon dioxide)
body
heart
The ocean pumps water through the water cycle and produces and delivers oxygen.
size
role
Wetlands
cover about _____of the earth’s land area
6%
home to around _____of all the ...
get rid of________
make the water ______
prevent ______...like huge ________
40%
pollution
clean
floods
sponges
Nickname
the"_________"of the earth.
kidneys
How are wetlands like the Earth's kidneys
clean your blood by removing waste
balance the amount of water in our body.
Plants in wetlands help get rid of pollution.
Wetlands help prevent floods during heavy rains.
Forests
size
role
Nickname
make up nearly ______ of the earth's land area
take in ____________
produce _________
trap _______ things in their leaves
help ______ the air
the"_________"of the earth.
a third
carbon dioxide
oxygen
harmful
clean
lungs
“ Which word can we use to replace the word "trap"
A. keep B. drive C. produce
How are forests like the Earth's lungs
Exchange Gases
Take in Oxygen
Remove Carbon Dioxide
Forests help the planet
"breathe." Trees take in carbon dioxide and release fresh oxygen, cleaning the air just as our lungs do for our bodies.
Why does the writer use similes in this article
To create a strong image
To connect and care
If Earth is like a body, we should protect its “heart,” “kidneys,” and “lungs.”
To show importance
Tell us these ecosystems are VITAL, like organs in a body..
To explain clearly
Make hard ideas easy to understand
Help readers “see” and remember
巩固迁移
Part 3--How important are the ecosystems
How important are the ecosystems
Support Life
Keep the Planet Healthy
Make the World a Better Place
How do human activities affect the ecosystems
Discussion
Deforestation
(cutting down forests)
Pollution (plastic in oceans)
Overfishing
Building cities (destroys
habitats)
01
Use less plastic
....
Reduce & Recycle
03
Walk, bike or bus
Green Choices
02
Turn off lights and taps...
Save Resources
04
Plant a tree or flowers
...
Care for Nature
05
Share green tips with friends
...
Learn & Share
How Can We Protect Ecosystems
小结生成
To treat the earth kindly
is to treat oneself kindly.
课堂反馈
surface
is home to
Simon is listening to a podcast about the ocean plete the script with the correct forms of the words and phrases in the box below.
oxygen
take in
store
role
get rid of
balance
Thank You

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