资源简介

(共25张PPT)
Key question
What role does electricity play in our daily lives
Unit objectives
I can:
□understand why electricity is important.
□explain different ways of producing electricity.
□observe safety rules for using electricity.
□talk about how to save electricity.
First thoughts
Electricity can be used as a source of energy for transportation
Don’t use electrical with wet hands. Unplug the power in time.
Electricity cannot be seen with naked eye.
Lightening is also a form of electricity.
Use energy – efficient appliances.
Check and repair
appliances regularly.
Section
1
Experiencing and understanding language
Reading
Before you read
1 How much do you know about electricity Try the quiz below.
(1) Which of the following can be found in nature Which is man-made What do
the pictures have in common
Lightning can be found in nature, A light bulb and batteries are man-made. They are all related to electricity.
(2) Below are three different ways of producing electricity. Write the
correct phrases in the blanks.
wind power
water power
solar power
2 Discuss in pairs why electricity is important in our daily lives.
举一个例子
靠电运行
Read the story and find out what Daisy’s weekend without electricity was like.
A switch-off weekend
by Daisy from Grade 7
Last week, our science teacher, Mrs Brown, taught us about electricity and how important it is. Then she gave us a special task: to try living without electricity for a weekend. Our family thought it sounded interesting, so we decided to do it together.
停电
上周
决定做某事
However, it turned out that it was very hard to live without electricity. After it got dark, my little brother Benny and I could only read and write by candlelight. We usually watch a movie together on Friday nights, but the TV doesn’t work without electricity. Instead, we played video games for a while, but then our tablet ran out of battery. “What about tomorrow ” we thought.
证明是
get dark 变暗
看电影
一会儿
run out of 用完，耗尽
Since there wasn’t any electricity, some things in the fridge quickly went bad. When we woke up on Saturday morning, we discovered that we couldn’t eat our breakfast cereal① —we didn’t have any milk or yogurt! By noon, it got really hot inside our apartment, but we couldn’t turn on the air conditioner. Even worse, most household tasks became very difficult without electricity. For example, we had to wash all our clothes by hand, and this took us a lot of time.
go bad 变坏
wake up 醒来
打开
更糟糕的是
have to do 不得不
by+方式 用，凭借
take time 花时间
However, there were also nice things about living without electricity. On Sunday, we went on a bike trip and visited my grandparents in the countryside. We enjoyed a picnic in their garden, and we also played chess and painted pictures together. At night, we sat under the stars and listened to my grandad’s stories.
This was a really interesting experience, but I cannot imagine living without electricity for more than a few days.
go on a trip 进行一次旅行
在农村
下棋
在晚上
imagine doing sth. 想象做某事
Reading comprehension
1 Answer the questions with the information from the story on page 85.
(1) What did Daisy learn in her science class last week
_________________________________________________________________
(2) What was special about last weekend for Daisy
_________________________________________________________________
(3) How did Daisy’s feelings change throughout the story
_________________________________________________________________
__________________________________________________________________________________________________________________________________
She learned about electricity and how important it is.
She lived without electricity for a weekend.
At first, She thought it sounded interesting to live without electricity, and then she found it was very hard. Next, she found there were also nice things about living without electricity. At last she found this was a really interesting experience.
2 What does Daisy's family usually do at the weekend, and how was their
last weekend different Complete the notes below.
watch a movie together on Friday nights
eat breakfast cereal in the morning
turn on the air conditioner
use the washing machine to wash the clothes
played video games for a while, but then the tablet ran out of battery
some things in the fridge quickly went bad
couldn't turn on the air conditioner
most household tasks became very difficult without electricity
went on a bike trip and visited Daisy’s grandparents in the countryside
(答案不唯一，仅供参考)
3 Try a switch-off weekend yourself and then share your
experience with your classmates.
Vocabulary practice
1 The words and phrases in italics are from the story on page 85.
Choose the correct answers to complete the sentences.
(1) If you do something for a while, you do it _________.
a every day b sometimes c for some time
(2) If a battery runs out, there is _________ electricity left in it.
a no b a lot of c some
c
a
(3) We put things in the fridge to keep them _________.
a warm and tasty b cold and fresh c hot and dry
(4) If your family lives in an apartment, you _________ as other families.
a live in the same room c live in the same building
b live in the same house
(5) The food has gone bad, so we _________.
a cannot eat it b put it in the fridge c have to cook it
b
c
a
2 Complete the passage with the words and phrases in italics from
Exercise 1. Change the form if necessary.
apartment
while
fridge
go bad
ran out
3 Make sentences about a day without electricity with the words
and expressions below.
Listening
Interesting facts about electricity
1 How much do you know about electricity Discuss the questions
in pairs.
(1) Is electricity an invention or a discovery
(2) How fast does electricity travel
(3) Is the electric car a new idea When was it first invented
It was a discovery.
It travels about 300 million meters per second.
No, it isn’t. It was first invented around 1832.
2 Listen to a podcast about electricity and tick ( ) the topics
mentioned in it.
(1) Who first discovered electricity
(2) How we produce electricity today
(3) How electricity travels to our home
(4) When the first electric car was invented
(5) How much electricity is wasted each year in the UK and the USA



3 Listen again and complete the notes.
smooth stone
light
the first electric car
the second half of the 19th century
billions of prounds
offices
4 What other interesting facts about electricity do you know
Share them with your classmates.
Homework
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Key question
What role does electricity play in our daily lives
Section
2
Grammar
Exploring and applying rules
Modal verbs: can and cannot, may and may not, must and must not
Modal verbs can be used to talk about ability, permission, obligation, etc.
Daisy is telling her brother Benny about her science lesson. Read their dialogue and pay attention to the words in bold.
give sth. back to sb. 把某物还给某人
1 Daisy got a robot for her birthday. Complete the conversation with can,
can’t / cannot, may, may not, must, mustn’t / must not.
Daisy: Thank you, Dad. It is the best gift in the world!
Dad: You (1) _______ name your robot now.
Daisy: I think I’ll call him “Bobo”.
Dad: That’s a good name.
Daisy: How (2) _______ I turn him on
Dad: First you have to put the batteries inside here. Then you (3) _______
switch it on. Now you (4) _______ talk with “Bobo”.
Bobo: Hello. Please give me a name.
Daisy: Hello. I’ll name you “Bobo”.
Bobo: I love my name, thank you.
can
can
can
can
Dad: Bobo, please tell us what you (5) _______ do.
Bobo: I (6) _______ dance and sing and play football. I (7) _______ play chess and
I (8)_______ speak Chinese, English and French.
Daisy: Wow! You (9) _______ help me with my homework then.
Bobo: If you have questions, you (10) _______ ask me. But you (11) _______ do
your homework yourself.
Daisy: OK. I’ll go swimming in the afternoon. (12) _______ you come with me
Bobo: Sorry. I (13) _______ swim. I (14) _______ stay away from water. If I get
wet, I’ll become ill and won’t work anymore. So you (15) _______ put me
in the water.
Dad: Daisy, here are the instructions for “Bobo”. You (16) _______ read them
very carefully and find out what you can and (17) _______ do.
Bobo: Let me read them out for you, master. ...
can
can
can
can
can
may
must
Can
can’t
must
mustn’t
must
can’t
2 Imagine you are Daisy. Your little brother Benny is going to primary school
in the new term. You are telling him some dos and don’ts about school life.
Write them down.
Dos
(1)_______________________________________________________________
(2)_______________________________________________________________
(3)_______________________________________________________________
(4)_______________________________________________________________
(5)_______________________________________________________________
You must be on time.
You must listen to the teacher carefully.
You must wear the school uniform.
You must be quiet in the library.
Don’ts
(1)___________________________________________________________
(2)___________________________________________________________
(3)___________________________________________________________
(4)___________________________________________________________
(5)___________________________________________________________
You mustn’t fight with others.
You mustn’t talk loudly in the library.
You mustn’t run in the hallways.
You mustn’t listen to music in class. (答案不唯一，仅供参考)
Homework
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Key question
What role does electricity play in our daily lives
Section
4
Extending and developing competencies
Focusing on culture
There are many ways to save electricity. Once a year, people take part in Earth Hour and turn off their lights for one hour. Let’s learn more about this event.
1 Read the article about Earth Hour and think about what we can do to save
the Earth.
What is Earth Hour
On the last Saturday night of March every year, people around the world turn their lights off for one hour. They do this because they care about climate change. They are trying to show that small changes can make a great difference to our planet.
关心，在意
产生巨大影响
How did it start
The World Wildlife Fund (WWF) started Earth Hour in 2007, in Sydney, Australia. More than 2.2 million homes and businesses joined in. Even the lights at the Sydney Opera House were out for an hour. This saved a lot of electricity. The same amount of electricity could power thousands of computers or television sets for an hour. When the lights were out, the stars were clearer in the sky.
People in China liked this idea too. They started to take part in the event in 2008. Every year, many landmark buildings in Chinese cities turn off their lights for Earth Hour.
参加
同样数量的
参加
What can you do
You can take part in Earth Hour next March. Find out the date and time of the event on the Earth Hour website. When the time comes, turn off your lights and enjoy your special hour in the dark. It will be even more fun if you ask your friends, family and classmates to join as well.
找出：弄明白
在黑暗中
也
2 Answer the questions with the information from the article on page 94.
(1) When do people take part in Earth Hour Why do they do it
(2) What were the benefits of the first Earth Hour
On the last Saturday night of March every year, Because they care about climate change.
It saved a lot of electricity, And when the lights were out, the stars were clearer in the sky.
3 Complete the sentences with the words and phrases below. Change the
form if necessary.
(1) This power station produces enough energy to _______________ a city of
one million people.
(2) We only have one Earth, so that’s why people _______________ so much
_______________ the environment.
(3) Would you like to ______________ Earth Hour next week
(4) Remember to switch off the air conditioner when you leave home, otherwise
you will waste a large ______________ of electricity!
(5) People around the world are worried about _______________, but there is
luckily a lot we can do about it.
power
care
about
take part in
amount
climate change
4 Discuss the questions below.
(1) Do you think Earth Hour is useful Why or why not
(2) Have you ever taken part in Earth Hour events before If yes, describe
what you did. If not, would you like to take part next March What do
you think you will do
Yes, I do. Because it can help save energy and protect the environment.
No, I haven’t, I’d like to take part in it next March, I will turn off all lights and electrical appliances at home.(答案不唯一，仅供参考)
Cross-curricular connection | Biological science
People around the world mostly burn oil, gas or coal to produce energy. This causes two huge problems—pollution and global warming. Countries around the world have developed different kinds of renewable energy. Let’s see what they are.
1 Read the text about how different countries use renewable energy,
and then match the paragraphs (A–E) with the pictures (1–5).
Renewable energy
A The Three Gorges Dam is the biggest dam in the world. It took more than 10 years to build. China is the country that makes the most electricity from hydropower.
B Some of the world’s biggest wind turbines① are off the coast of Britain. Their blades② are bigger than the London Eye! One turn powers a house for around 29 hours!
在世界上
It takes/took … some time to do 花费时间做某事
离岸
E
D
C
B
A
C One of the biggest solar farms in Australia is on a sheep farm. Thousands of solar panels make about 200 million hours of electricity a year. They also protect the sheep from sun and rain!
D Iceland has a lot of volcanoes which produce hot water and air. So about 30% of the country’s electricity comes from geothermal③ energy. It’s very cheap!
E The USA grows the most biofuels④ , usually corn. Most cars there can use 10% vegetable fuel mixed with oil. Many cars can just use biofuel.
protect … from 保护……免受伤害
来自
mix with 混合
2 Discuss the questions below.
What kinds of renewable energy are used in your area What are the advantages of them
Checking your progress
Project
Making a poster about how to use electricity wisely
How can we save electricity and make the Earth a better place Work in groups and make a poster about wise ideas of using electricity.
Step 1 Discuss the questions in groups and gather ideas.
When and where do we need to use electricity
Can we find new ways of producing electricity
How can we use electricity wisely
Step 2 Work in groups. Discuss and decide on what to include in your poster about
using electricity wisely. Here is an example.
Step 3 Display all your posters on the classroom wall and vote for the best.
You can refer to the following criteria.
creative and practical ideas
correct and clear language
logical presentation of ideas
并没有能源危机，只有无知的危机。
——理查德·巴克敏斯特·富勒
Homework
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Key question
What role does electricity play in our daily lives
Section
3
Speaking
Expressing and communicating ideas
Talking about using electricity safely
Talk in pairs about safety rules for using different electrical appliances. Look at the example and use the tips below to help you.
S1: We use different electrical appliances in our homes every day. How
can we use them safely
S2: We need to make sure that the cables are connected correctly before
we turn on the device. And we mustn’t touch any electrical appliances
with wet hands.
S1: That’s right! Also, we cannot use any broken cables.
...
ma-chine
pro-due
ex-er-cise
im-por-tant
Writing
Writing rules for saving electricity at home
1 Look at the pictures. Discuss some dos and don’ts of using electricity
at home. Then think of more rules.
关闭
打开
关闭
2 Now write your family’s rules for saving electricity.
Step 1 Plan Organize your ideas. Use the examples in Exercise 1 to help you.
Step 2 Write Make a list of rules for using electricity wisely at home.
Remember to use modal verbs in your writing.
Using electricity wisely at home
We must turn off the lights when we leave a room.
We must turn off the TV when nobody is watching it.
We must not leave the air conditioner on when no one is at home.
We must use natural light instead of electric lights during the day.
We must not use too many electrical appliances at the same time.
We must energy-efficient applicances, like LED bulbs or fridges
with an energy saving label.
We must pull out plugs in time.
We must check the wires regularly and repaire the broken ones.
Step 3 Check and revise Tick ( ) the boxes to check your writing,
and then revise it.
Homework
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