资源简介

(共15张PPT)
Unit 7 The natural world
Reading Ⅱ
The School Eco-club is working on a poster about the ecosystems in Qinhuai District.
What is an ecosystem
It includes all the living and non-living things in an area.
Look! This is my cute fish tank. We can often see such s_____ ecosystems in an office or at home. It i______ not only some fish but also plants. The n_______ things around, like the stones and water, are also part of it. Every time I see it, I feel r______.
mall
ncludes
elaxed
on-living
Facts about ecosystems
How much do they cover/ make up
The ocean
Wetlands
Forests
around 71% of the earth’s surface.
6% of the earth’s land area.
nearly a third of the earth’s land area.
Because green spaces __________________(≈ 45%) of the city’s built-up areas.
cover/ make up about 45%
How important are they
keep the planet healthy
keep the balance
support plants and animals
Each ecosystem has a role to play .
= play a role
make our world a better place
What do they do for our earth
produce ________
the ocean
support ________
oxygen
water cycle
The ocean plays an important role in keeping the earth _______________. It can slow down climate change.
Why
healthy/ balanced
rise to the sky
fall onto the land
return to the ocean
keep sth. + adj. (宾语补足语)
Xuanwu Lake is not just a beautiful park, but a key ecological friend for us. It _____ plenty of clean water. By controlling runoff (调节径流), it helps ________ the local water cycle. What’s more, the lake’s wetland areas can store rainwater to ________ small floods. It also ____________ in slowing down the urban heat island effect (城市热岛效应), keeping the areas around cooler.
play a role
hold
produce
prevent
support
holds
support
prevent
plays a role
Mrs Bird
Student: Hello, Mrs Bird. Where do you live
Mrs Bird: I live in Qiqiaoweng Wetland Park in Nanjing.
Student: Are wetlands important for the earth
Mrs Bird: Of course they are. They are home to... Plants here help ... and ... Wetlands also help _______________.
Student: Oh, they ________ our kidneys. We should protect them well.
Mrs Bird: Yes, but ...
prevent floods
act like
prevent sth.
prevent/stop sb. (from) doing sth.
act to do = take action to do
Work in pairs and talk about wetlands.
wetlands
... some businessmen change the wetlands into tall buildings, meaning less space for wildlife. Factories also put wastewater into the wetlands. Moreover, tourists may throw rubbish carelessly. Human activities are the biggest problem for us.
Wetlands are in danger, please help!
Problems
We should prevent businessmen _______________________________
_______________________________.
We should also prevent factories _______________________________
_______________________________.
Moreover, we prevent tourists___
_________________________________.
from changing the wetlands into tall buildings
from putting the wastewater into the wetlands
from throwing rubbish carelessly
A. take in carbon dioxide
C. trap harmful things
forests
harmful adj.
be harmful to
harm vt. & n.
harm ...
do harm to ...
Forests face big problems from human activities. Cutting down trees and polluting rivers near forests _____________________(伤害动植物). These actions are _______ to the whole ecosystem. We must stop these to protect forests.
Mr Forester
harm plants and animals
harmful
B. produce oxygen
E. help clean the air
D. harm the balance
Another ecosystem: rivers
Rivers c_______ only 0.1% of the earth’s surface but they h ______ over 70% of the earth’s fresh water. Rivers are home to ____________. They also ________________ and play a role in _________________.
Task 1
Complete the introduction.
Pay attention to your writing.
Time: 3 minutes
Evaluation
标准 Criteria ★★★ (Excellent! ) ★★ (Good! ) ★
(Try Harder! )
Content 内容 All points Most points Few points
Language 语言 Correct Mostly correct Many mistakes
Writing 书写 All clear Mostly clear Unclear
Total Score : ____ / 9
Problems with ecosystems
(1)What does the Qinhuai River provide
water for
(2)What problem did factories bring to
the Qinhuai River
(3)What made it harder for the river to
clean itself
Task 2
Read a report for the eco-problems of the Qinhuai River.
Complete the second part of the poster.
Time: 3 minutes
Protection for ecosystems
Let’s act to protect the Qinhuai River together. We can _________
________________. We can also ___________________________.
Moreover, we __________________________________________.
Task 3
Discuss in groups and talk about the protection.
Complete the third part of the poster.
Time: 3 minutes
To treat the earth kindly is to treat ourselves kindly.
Please join us!
Homework
Watch a documentary (纪录片) named The Chinese Wetlands and share it with us.
1.Polish up your poster to make it better and post it on the school noticeboard.
2.Finish exercises from KKL.
for All
for Some

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