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(共32张PPT)
Unit 5 Great inventions
Lesson 5 Refrigerator timeline
冀教版（2024）八年级
下
1.握与冰箱发展相关的核心词汇与短语：refrigerator, preserve food, artificial refrigeration, mass production, energy-saving, timeline 等。
2.能够从发明的时间线中找出关键节点信息（如时间、人物/发明者、事件与变化），完成理解任务，并用时间顺序梳理“发明-改进-普及”的发展脉络，形成对技术演变的整体认识；
3.能够小组协作选择一种发明，通过查阅资料筛选信息，制作出结构清晰、图文结合的时间线作品，并进行口头介绍与分享，做到表达清楚、突出重点，还能对同伴的作品做出简单反馈。
00
Learning objectives
I’m a useful machine in every home.
I keep food cold and fresh all day long.
Milk, fruit, meat and drinks live inside me.
In hot summer, I bring you coolness.
What am I
Riddle time
A refrigerator / fridge
Brainstorm
Let's watch a video.
Brainstorm
Most of us know the importance of the refrigerator. Do you want to know when the first refrigerator was invented and who invented it
Today we will know more about the development of the refrigerator.
Fast reading
The main idea:
This timeline shows the evolution of food preservation and refrigeration technology over centuries.
Skim the passage and find out:
Read the timeline and tick the inventor of the first refrigerator.
1
□ William Cullen □ Oliver Evans □ Fred.W.Wolf

A When did refrigerators become popular in some countries
a. In the 1920s
b. In the 1800s.
c. In the 1980s
B What was true about using refrigerators in the 1990s
a. A refrigerator was considered a luxury item.
b. The running cost of a refrigerator is so high that no one could afford one.
c. Energy-efficient refrigerators had become the new normal
Read the timeline again and circle the correct answers.
2
奢侈品
使用成本
买得起
节能的
常见的
Read the timeline for the third time and complete the mind map below.
Ancient times
1748
1890s
1918
1940s
1996
1600s
1805
1913
1920
1980s
Ancient times: Ancient China, Greece, and Rome used ice or snow to preserve food by freezing or chilling it.
1600s: Icehouses were used to preserve food all year round.
1748: William Cullen did an experiment on artificial refrigeration.
1805: Oliver Evans designed the first refrigeration machine.
Language points
Underline the key expressions.
保存
通过冷冻或冷藏的方式
被用来做某事
一整年
做关于...的实验
人工制冷
设计
制冷机
冰库
1890s: Iceboxes became popular. They were smaller icehouses meant for home use.
1913: Fred W. Wolf invented the first home electric refrigerator.
1918: Mass production of home refrigerators began.
1920s: Refrigerators became popular in some countries.
1940s: Freezer compartments were added.
1980s: Water dispensers were added.
1996: Refrigerators became more energy-saving.
冰盒
变得流行
专为家庭使用（设计）
家用电动冰箱
...的大规模生产
冷冻室
被加装
取水装置；饮水机
节能的
compartment n.（家具或设备等的）分隔间，隔层
Ancient China, Greece, and Rome used ice or snow to preserve food by freezing or chilling it.
freeze /fri z/ v.（使）冻结；结冰。既可作及物动词，又可作不及物动词。 过去式为froze；过去分词为frozen
句
讲
Language points
例
e.g. Water freezes at 0°C. 水在0摄氏度时结冰。（不及物动词）
The cold weather froze the ground.
寒冷的天气使地面都冻硬了。（及物动词）
freeze 可表示“(因寒冷或恐惧) 冻僵；呆住”。
常见搭配：freeze up (机器等) 冻住/ 停止运转；(人) 变得冷淡
相关词汇：
frozen adj. 冷冻的；结冰的 freezing adj. 极冷的
拓
They were smaller icehouses meant for homes in the city.
be meant for sb./sth.为某人/某物而设计
be meant to do sth. 应该做某事；目的是做某事
句
讲
Language points
例
e.g. The book is meant for beginners.这本书是为初学者准备的。
The software is meant to protect computers from viruses.
该软件旨在保护电脑免受病毒攻击。）
mean 1）动词：意思是；意味着（最基础）
常见搭配:mean + doing sth. 意味着做某事
2）动词：打算；想要（表达意图）
常见搭配:mean to do sth. 打算/有意做某事
3）形容词：吝啬的；刻薄的（口语常用）
拓
Refrigerators became more energy-saving.
energy 的一词多义：1) 作“能源”讲时，指电力、燃料等可利用的能源，为不可数名词。2) 作“能量”讲时，指物理概念或人体活动所需的精力，为不可数名词。 3)[可数名词]精力；力量。常用复数形式，强调付出的脑力或体力
常见搭配：take energy from 从……吸取能量 save energy 节约能源 solar energy 太阳能 相关词汇：energetic adj. 精力充沛的
句
讲
Language points
例
e.g. Food provides us with energy. 食物为我们提供能量。
She’s always full of energy. 她总是充满活力。
She put all her energies into work.
她把全部精力都投入到了工作中。
1. 古时候的中国
2. 储存食物
3. 通过做..的方式
4. 被用来做某事
5. 全年
6. 做关于...的实验
7. 为某人/某物而设计
8. 应该做某事；目的是做某事
9. 家用电动冰箱
10.冷冻室
11.取水装置；饮水机
Ancient China
preserve food
by doing sth
be used to do sth
all year round
do an experiment on...
be meant for
be meant to do sth.
home electric refrigerator
freezer compartments
water dispensers
Phrases summary
Complete the short passage.
The refrigerator is important in our daily life. Let me introduce the development of it.
In ancient times, Ancient China, Greece, and Rome used ______ or ______ to preserve food by ______ and ______ it. In the 1600s, _________ were used to preserve food all year-round. In 1748, William Cullen did an experiment on artificial refrigeration. In ______, Oliver Evans designed the first refrigeration machine. In the 1890s, iceboxes became _______. They were smaller icehouses meant for home use. In 1913, Fred W. Wolf ______ the first home electric refrigerator. In 1918, mass production of home refrigerators began. In the 1920s, refrigerators became popular in some countries. In the 1940s, ______ compartments were added. In the 1980s, water dispensers were added. In 1996, refrigerators became more ______-saving.
ice
snow
freezing
chilling
icehouses
1805
popular
invented
freezer
energy
Consolidation
Retelling time
Retell the history of refrigerators.
Hello everyone, let’s walk through the history of the refrigerator together.
In ...,
New drills
Do you know any other inventions in our daily life
What invention do you think is the most important
What influence have it had
Top 10 “inventions” that changed the world
3. The Bar code (条形码)
4. TV Dinners (冷冻快餐)
5. PlayStation
(家庭电视机游戏)
1. GPS Technology
2. The Sony Walkman
Background
8. Electronic Money
7. Text messages
9. Microwaves
10. Trainers
6. Social Networking
Work in groups. Make a timeline together for an invention.
3
A Discuss and choose an invention.
Search the internet,check out books from the library,or visit a museum related to your topic.
Choose an invention and share the information you have gathered.
Make a list of events about that invention.
B Create a framework
· Draw your timeline.
· Choose a start and end point.
· Put the most important dates on the timeline.
C Fill in your timeline
· Add details and important information about each event.
· Write clearly and concisely.
· Add pictures.
Make your timeline about the invention. Put the most important dates on the timeline and add details and important information.
1878—Thomas Edison
Thomas Edison improved the telephone, so voices could be heard more clearly.
Phone Timeline
1800
1876—Alexander Graham Bell
The telephone was invented by Alexander Graham Bell.
People could talk to someone far away.
1900
1973—Martin Cooper (Motorola)
The first mobile phone call was made by Martin Cooper. People could talk on the move.
2000
2007—Steve Jobs (Apple)
The smartphone (iPhone) was introduced by Apple.
Phones could do much more than calling.
1992—Neil Papworth
The first text message (SMS) was. sent by Neil Papworth. Messages became fast and convenient.
2010s—Apps and mobile internet
Apps and mobile internet were widely used, and phone became a daily tool for studying, shopping, and paying.
Example:
Use the timeline to introduce the invention to your class.
Hints:
Today I want to introduce a great invention—the...
It was invented in...and has changed...in our lives.
It became popular in... People use it to...
Later, ...was added, making it more... It is very useful for...
Hello everyone. Today I'd like to introduce an invention
that has changed our lives a lot — the phone.
First, in 1876, the telephone was invented by Alexander Graham Bell. For the first time, people could talk to someone far away without being face to face.
Then in 1878, Thomas Edison improved the telephone, so voices became clearer and the telephone was easier to use.
Next, the phone became mobile. In 1973, the first mobile phone call was made by Martin Cooper from Motorola. This was a big step forward because people could communicate while moving.
Example:
Later, in 1992, the first text message was sent by Neil Papworth. After that, people could send quick messages instead of making a call every time.
In 2007, the smartphone was introduced by Apple, and Steve Jobs played an important role in this change, Phones were not only for calling anymore. We could take photos,listen to music,and go online.
Since the 2010s, apps and mobile internet have been widely used, so phones have become a daily tool for studying, shopping, and even paying.
In my opinion, the phone is one of the greatest inventions. It helps us stay connected and makes our lives more convenient. Thank you for listening.
Show time
Checklist Stars
Language(语言正确)
Pronunciation(发音标准)
Body language(使用肢体语言)
Creation(有创意)
Excellent Great Good
Innovation transforms lives—from ancient ice to smart fridges, every invention starts with solving problems.
Homework
1. Finish the self-check on the learning sheet. (Required)
2. Retell the development of the refrigerator. (Required)
3. Write a passage about an invention that has appeared in recent years and make an information card. (Optional)
https://www.21cnjy.com/recruitment/home/fine
Thanks!

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