资源简介

(共28张PPT)
Welcome to the Unit
Unit 8
A green world
Learning aims
能说出不同的污染及其成因
能谈论如何减少污染
Lead in
What’s the video about
Activity 1
Say different kinds of pollution and their causes
Look and say
soil pollution
noise pollution
air pollution
water pollution
Do you know what types of pollution are shown in the pictures
Do you know other types of pollution
forest
pollution
oil
pollution
soil pollution
factory waste
too many farm chemicals
rubbish
heavy metals
noise pollution
traffic noise
factory machines
building work noise
loud music and parties
What are the causes of these kinds of pollution
air pollution
factory smoke
car exhaust (废气)
burning coal and oil
forest fires
water pollution
dirty water from factories
dirty water from homes
farm chemicals
oil leaks (泄露)
Type Causes
Soil pollution Chemical waste
Other rubbish from humans
(1) __________________ too many trees
Noise pollution Noise from (2) __________________, trucks and buses on the road
Noise from building work
Air pollution Burning of unclean fuels
(3) __________________
Water pollution Chemicals poured into rivers and lakes
(4) __________________
The Class 1, Grade 8 students are learning about pollution. Listen to the introduction to four types of pollution and fill in the blanks.
Cutting down
cars
Smoke from factories
Wastewater
Can you talk about other causes of the four types of pollution
Over-using chemical fertilizers and waste from farms ...
Loud music in public and fireworks at festivals ...
Burning leaves and stalks and smoke from barbecues ...
Trash ending up in rivers and dirty water from washing dishes and cars ...
Further thinking
Activity 2
Talk about how to reduce pollution
After learning about the causes of the four types of pollution, how can we reduce pollution
Millie and Daniel are talking about reducing pollution. Listen to the conversation and complete the table below.
Air pollution Water pollution
1. ___________to school with others. 2. Take_______. 3. ______________. 1. Use _______________
cleaning products.
Share a ride
the bus
Plant more trees
more eco-friendly
Millie: What can we do to reduce air pollution
Daniel: It’s a good idea to share a ride to school with others or take the bus.
Millie: Yes. We can also ride a bike if we live close.
Daniel: Good idea. We can plant more trees.
Millie: I agree. And what about water pollution Some rivers don’t look clean and clear!
Daniel: We should use more eco-friendly cleaning products.
Millie: Yes. That will reduce water pollution.
Reading
Millie: What can we do to reduce air pollution
Daniel: It’s a good idea to share a ride to school with others or take the bus.
Millie: Yes. We can also ride a bike if we live close.
Daniel: Good idea. We can plant more trees.
Millie: I agree. And what about water pollution Some rivers don’t look clean and clear!
Daniel: We should use more eco-friendly cleaning products.
Millie: Yes. That will reduce water pollution.
Role play
Think & share
How to live a green life
reduce air pollution by riding bicycles
It’s wise for people to choose public transport.
Means
of
transport
save energy by turning off the lights when leaving
wind energy
solar energy
save energy by using natural resources
save water by taking shorter showers
Reuse the water to flush the toilet.
protect the environment by recycling waste
Which type of pollution is the biggest problem in your hometown Explain.
Version 1: In my hometown, air pollution is the biggest problem. Many factories give off black smoke. Also, there are too many cars on the roads. Their exhaust makes the air dirty. On foggy days, we can’t see far and my throat feels bad.
Version 2: I think the biggest environmental problem in my hometown is soil pollution. It comes from many things, like thrown-away cigarette butts and too much chemical fertilizer on farms.
What can we do to solve the biggest problem in our hometown to live a greener life
Let’s Fix Air Pollution in Our Hometown
First, factories should clean their smoke. They can use machines to make the black smoke clean before letting it out. If some factories keep polluting and don’t change, the government should punish them according to law or even close them down.
Second, we can ride bikes or take buses more. Students can ride bikes to school, and grown-ups can take buses to work. Fewer cars mean less exhaust. Maybe we can also drive electric cars—they don’t make exhaust at all!
Let’s plant more trees! Trees are great air cleaners. Planting them in parks and neighborhoods will help take in dirty air.
Small steps can make a big difference. Let’s work together to make the air in our hometown clean again!
Language points
1. Chemicals poured into rivers and lakes
这里是过去分词短语作后置定语，用来修饰前面的名词chemicals。
名词chemicals和动词pour之间是被动关系 —— 化学物质是"被倾倒"的对象，因此用过去分词poured来体现被动。
chemical adj. 化学品的；化学的 c.n. 化学制品
e.g. We learn chemical knowledge in science class.
我们在科学课上学习化学知识。
Some chemicals in the river are bad for fish.
河里的一些化学制品对鱼有害。
拓展：n. chemistry 化学（学科）chemist 化学家；药剂师
pour vt. & vi. 倾倒，倒出；倾泻
pour ... into ... 把……倒入……
pour down（雨）倾盆而下
e.g. Please pour some water into the glass.
请往杯子里倒些水。
The rain poured down all night.
雨下了一整夜。
Summary
◆重点词汇
◆重点句式
cause, soil, chemical, truck, unclean, fuel, pour, clear, eco-friendly, separate
It’s a good idea to share a ride to school with others or take the bus.
We can also ride a bike if we live close.
We can plant more trees.
We should use more eco-friendly cleaning products.
That will reduce water pollution.
Exercise
根据汉语提示填写单词
1.Too many 　　　　(化学制品) can hurt small animals.
2.　　　　 (卡车) on the road make too much noise every day.
3.People should stop 　　　　(污染) rivers with waste water.
4.We should use 　　　　___(环保的) bags instead of plastic bags.
5.Cutting down too many trees is one of the causes of 　　　　(土壤) pollution.
chemicals
Trucks
polluting
eco-friendly
soil
Homework
(1) Introduce the ways to reduce pollution in daily life.
(2) Recite the conversation in B and make up a new one.

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