Unit 4 Amazing Science Topic 3 Section C 课件(共32张PPT) 2024-2025学年英语仁爱版九年级上册

(共32张PPT)
Unit 4
Amazing Science
Topic 3 Section C
学习目标
重点探究
自主学习
学习导航
当堂检测
课堂总结
拓展提升
新课导入
What are the computers used for
学习目标
能熟悉并正确运用本课时的重点单词和短语
能掌握定语从句的结构和用法
能谈论电脑的重要性
自主学习
New words and expressions
entertainment n. 娱乐；招待
doubt n.&v. 怀疑，疑惑
no doubt 无疑地
tiny adj. 极小的，微小的
inside prep. 在……内；在……里 adv. 在里面
normally adv. 通常，正常情况下
brain n. 脑；智力；脑力
cancel v. 取消，撤销；废止
workplace n. 工作场所
connect v. 连接；把……联系起来
for instance 例如
besides adv. 而且，再说 prep. 除……之外(还)
properly adv. 正确地，恰当地
What are the computers used for
Doctors can find diseases easily with the help of computers.
In space, computers have been used to control the speed and direction of a spaceship.
In factories, robots are controlled by computers that are like human brains. They can do work that is dangerous to humans.
What can you do on a computer at home
play computer games
listen to music
chat with friends online
do shopping
do business
send emails
watch movies
重点探究
1. What do you often use the computers to do
2. Does the Internet make life simpler How
3. What problems have computers brought to us
Free Talk
education business
industry communication
daily life medical care
entertainment sports
1a Read and understand.
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√
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1. Tick the fields we use the computer in.
The Importance of Computers
Since computers were invented in the USA in the 1950s, they have become very important in many areas of work and leisure.There is no doubt that computers are very useful in technology and business. In space, computers have been used to control the speed and direction of a spaceship.With the help of computers, doctors can find diseases easily and solve other problems.For example, tiny computers which are inside patients' bodies can keep their hearts beating normally. In factories, robots are controlled by computers that are like human brains. They can do work that is dangerous to humans. In business, computers are used to place and cancel orders. They are also making the workplace safer and better.
Read and understand.
Since the Internet came into being, people's lives at home have been changed, too. More and more people have personal computers that are used to play games and watch movies. Thanks to the Internet, people can do shopping and do business at home. Instead of writing letters on paper, people communicate by sending e-mails and chatting on line. The whole world is connected. The Internet is making the world smaller, like a village.
Computers have improved our lives, but they have brought problems, too. For instance, if we work on computers too long, we may get headaches or sore eyes. If we play computer games too much, we won't have enough time to study or exercise. Besides, not everything we read on the Internet is true or good for puters help us at work and at home, but they must be used properly.
1b Read 1a and complete the following tasks.
Paragraph 1. Since computers were invented in the USA in the
1950s, they have become very important in many
areas of work and leisure.
Paragraph 2. Since the Internet came into being, people’s lives at
home have been changed, too.
Paragraph 3. Computers have improved our lives, but they have
brought problems, too.
1. Underline the topic sentence of each paragraph.
Read Paragraph 1, and fill in the chart.
Place The usage of computers
In space
In hospitals
In factories
In business
control the speed and direction
find diseases easily and solve other problems
do dangerous work
used to place and cancel orders
Read Paragraph 2, and answer the questions.
1. Have people’s lives at home been changed since the Internet
came into being
2. What do people use their personal computers for
3. The Internet is making the world smaller, isn’t it
Yes, they have.
People can use their computers to play games, watch movies, do shopping, do business, send e-mails and chat.
Yes, it is.
Read Paragraph 3, and fill in the blanks.
How should we use computers properly
1. We shouldn’t ________ (从事) computers too long, or
we may get _________(头痛) or sore eyes.
2. If we ______(花费) too much time ______ (play)
computer games, we __________(not have) enough time
to study or exercise.
3 .We shouldn’t believe ____________(一切) we read on
the Internet.
work on
headache
spend
playing
won’t have
everything
computers
usage
problem
work
daily life
_________________________ of a spaceship.
help doctors ___________________.
_______________ in factories.
help businessmen _____________________.
play games and_______________.
____________ and ___________ at home.
____________ by sending e-mails and __________________.
get headaches or ___________.
don’t have enough time ________________.
something on Internet is not ____________.
control the speed and direction
find diseases easily
control the robots
place and cancel orders
watch movies
do shopping
do business
communicate
chatting online
sore eyes
to study or exercise
true or good
2. Complete the following diagram.
How often do you use the computer
Often. Sometimes. Seldom. ...
2. What do you often do on the computer
Do some shopping. See movies. Play games. …
3. What do you think of the computer
Useful. Important. …
4. Do you think the computer is good for us
5. What’s your advice on using computers for your classmates
Group Work
Positive Side（正方） Negative Side（反方）
1.make…easier and simpler 1.cause us to be less social with …
2.open up the world 2…attack the web
3.stay in touch with 3.steal…
… …
Debate（辩论）
Suppose you were on a special day in 2030. During the day, there were no computers in the world. What trouble would you have You may begin like this:
One Day Without Computers
Today, when I got up, I just turned on the computer as usual, but it didn’t work. Then I tried my brother’s PC, my parents’, even my dog’s, but none of them worked. Later, it was reported on TV that all of the computers in the world broke down today…
2 Write a short passage with the title with One Day
Without Computers. The following information may
help you.
One Day Without Computers
Today, when I got up, I just turned on the computer as usual, but it didn’t work. Then I tried my brother’s PC, my parents’, even my dog’s, but none of them worked. Later, it was reported on TV that all of the computers in the world broke down today. So the world is quite different.
For instance, we can’t play games, watch movies or do shopping at home. Besides, we can’t communicate by sending e-mails or chatting online. Without the help of computers, businessmen can’t place or cancel orders online. Teachers can’t give lessons to their students.What’s worse, robots controlled by computers can’t do dangerous work for humans. Even the doctors can’t find the diseases easily.
In short, we almost have trouble with everything without computers today.
Language points
拓展提升
1. There is no doubt that computers are very useful in technology
and business.
毫无疑问电脑在技术和贸易业都非常有用。
doubt n. & v. 怀疑，疑惑
(1)doubt (vt.)+ 从句
I doubt whether/if he'll change his mind.
I don't doubt that they will be able to solve the problems.
(2)doubt (vi.)+ about / of
There is no reason to doubt of his honesty.
2. Instead of writing letters on paper,people communicate by sending
e-mails and chatting online.人们通过发送电子邮件和在线聊天的
方式进行交流，代替了用纸写信。
instead单独使用，可放于句尾，如果放于句中应该用逗号隔开。
而instead of通常放于句中，后面要加名词，代词，或者动名词。
I didn't go to Beijing, instead, he went there.
=I didn't go to Beijing, he went there, instead.
He went to Beijing instead of me.
instead of doing 代替，而不是……
He stayed at home yesterday instead of going out to watch movies .
昨天我呆在家里而不是外出看电视。
I gave him advice instead of money. 我给了他忠告，而不是钱。
3. The whole world is connected.网络连接了全世界。
connect v. 连接 connection n. 关系，联系
1.connect A with B 使A与B连接
2.connect sth. (to sth.) 使电、气、水等接通
3.connect sb./sth. (with sb./sth.) 与……有联系，把……联系起来
4. For instance ,if we work on computers too long ,we may get
headaches or sore eyes.
例如，如果我们在计算机前工作太久，也许会头痛或眼睛酸。
for instance, 例如，举例。
如：For instance,you can study English by listening to the tapes .
例如，你可以通过听磁带来学习英语。
such as, for example, for instance用法
such as用来列举整体之中的部分同类人或事物作例。such as
之前一般用逗号和主句隔开，such as之后没有逗号，直接加
名词性短语。
Some of the European languages come from Latin, such as
French, Italian and Spanish.部分欧洲的语言，例如法语、意
大利语、西班牙语，都是源于拉丁语。
for example是列举整体之中的一个为例，在句子中多用作插入语，位置可以在句首、句中或句末，用逗号与主句隔开，for example之后也有逗号。
Noise, for example, is a kind of pollution as well.
噪音，打个比方，也是一种污染。
for instance主要用于列举表示事例情况的例子。有时，相当于such as，后接具体的事物。
You can choose any one of them, for instance, this one on the left.
你可以选择其中任何一个，例如靠左边的这个。
5. Besides, not everything we read on the Internet is true or good for us.
另外，我们在网上看到的东西并不都是真实的、有益的。
(1)besides与except用于肯定句时，except意为“除……之外（不再有）”；besides意为“除……之外（还有）”。
如：I have another blue pen besides this one.
除了这支外，我还有另一支蓝色钢笔。（1+1，共2支）
We all passed the exam except Tom.
我们都通过了考试，汤姆除外。（整体中……汤姆一人不及格）
(2)except前几乎总有all、any、every、no及其复合词等词。
如：He answered all the questions except the last one.
除了最后一个问题没答外，其余问题他都答了。
(3)except后接名词、代词、动名词和动词原形，这时except=but；
但except后跟副词、介词短语时，不能用but代替。
如：The window is never open except in summer.
这扇窗户从来不开，除夏季外。
He did nothing except/ but clean the house.
他只是打扫了房子。
当堂检测
一、用方框中所给词的适当形式填空。
inside cancel connect doubt brain
1. There was some whether Yao Ming could become a
great basketball player or not.
2. Doctors believe that lung(肺) cancer is with smoking.
3. Can you tell me why the new year party was
4. The purpose of professor Read’s research is to compare computer
functions with working.
5. He was wild with joy when he opened the envelope and read the
letter .
doubts
connected
cancelled
brain
inside
课堂总结
掌握定语从句的结构和用法
谈论电脑的重要性
Unit 4 Topic 3
Section C