资源简介

(共18张PPT)
Unit 8
A green world
Welcome to the unit
学习目标
1
2
3
To master the new words and phrases.
To learn about different types of pollution.
To talk about reducing pollution and the biggest pollution problem in your hometown.
Lead in
What types of pollution do you know
Air/Water/Noise/Soil/Light/Plastic/Garbage pollution ...
Free talk
soil pollution
noise pollution
air pollution
water pollution
Four types of pollution.
Look and say
新课讲授
What can you see in the pictures
What causes four types of pollution
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
Listening
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
Millie and Daniel are talking about reducing pollution. Listen to the conversation and complete the table below.
Type How to reduce pollution
Air pollution (1) ___________________________ or take the bus.
(2) _____________ if we live close.
(3) Plant more trees.
Water pollution Use more eco-friendly cleaning products
Share a ride to school with others
Ride a bike
Listening
Listen to the recording of the conversation and read along, and then read aloud in different roles.
Listen and read
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.
Never throw rubbish, especially plastic and batteries, into rivers or lakes. Remember to sort rubbish and send it to the right place ...
Work in pairs and talk about how to reduce soil pollution and noise pollution.
Pair work
Work in pairs and talk about how we can reduce pollution. Use the conversation below as a model.
A: What can we do to reduce ... pollution
B: It’s a good idea to ...
A: Yes. We can also ...
B: Good idea. We can ...
A: I agree. And what about ... pollution ...
B: We should …
A: Yes. That will reduce ... pollution.
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.
Discussion
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。
2. We should use more eco-friendly cleaning products.
e.g. We should try to use eco-friendly products in our daily life.
我们在日常生活中应尽量使用环保产品。
eco-friendly / i k frendli/ adj. 环保的
eco-friendly products/materials/energy 环保产品/材料/能源
Homework
Recite Part B on page 107.
Preview Reading on pages 108-111.

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