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(共26张PPT)
Unit 4 Amazing Science
Section C
Topic 3 China is the third nation that sent a
person into space.
Learning aims
1. Some words: doubt, tiny, inside, brain,cancel, connect
2. Some phrases: no doubt, for instance
3. Some sentences:
(1) There is no doubt that computers are very useful in technology and business
(2) Computers help us at work and at home, but they must be used properly.
4. To learn and master the skills of writing.
Review
( ) 1. Thanks for _____ me to your birthday party.
A. invite B. invitation C. invites D. inviting
( ) 2. —Liu Hua studies hard at English recently.
—Yes. He’s made up his mind _____ his English.
A. improve B. improved C. improving D. to improve
3. It’s important __________ (master) computer technology.
4. So I advise you __________ (discover) new ways __________ (make)
computers serve us better.
5. We need four more people to finish the work. （改为同义句）
We need ____________ people to finish the work.
D
D
to master
to discover
to make
another four
What are the computers used for
1a Read and understand.
1. Tick the fields we use the computer in.
education business
industry communication
daily life medical care
entertainment sports
2. Can you give an example of the use of the computer in
one of the fields above
Doctors can find diseases easily with the help of computers.
Can you give an example of the use of
the computer in one of the fields above
In space, computers have been used to control the speed and direction of a spaceship.
Fast reading
1b Read 1a and complete the folloeing tasks.
1. Underline the topic sentence of each paragraph.
Para 1:
Since computers were invented in the USA in the 1950s, they have become very important in many areas of work and leisure.
Para 2:
Since the Internet came into being, people’s lives at home have been changed, too.
Para 3:
Computers have improved our lives, but they have brought problems, too.
What’s the writer’s purpose of writing this passage
A: to tell us computers have some disadvantages.
B: to tell us computers have many advantages .
C: to tell us computers are useful, but they must be used properly .
1b 2. Complete the following diagram.
computers
usage
problem
work
daily life
______________________________ of a spaceship.
help doctors ______________________.
____________________ in factories.
help businessmen ________________________.
get headaches or ____________.
don’t have enough time __________________.
something on the Internet is not _____________.
play games and _______________.
______________ and _____________ at home.
________________ by sending e-mails and _________________.
control the speed and direction
find diseases easily
control the robots
place and cancel orders
watch movies
do shopping
do business
chatting online
communicate
sore eyes
to study or exercise
true or good
Careful reading
1a Read and understand.
Paragraph 1
Read para.1 and fill in the following table.
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
Paragraph 1
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.
There is no doubt that … 无疑，毫无疑问……
e.g. There is no doubt that we will be successful.
There is no doubt that he’s an honest man.
keep sb. /sth. doing sth. 让某人一直做某事
keep + adj. / keep sb./sth. + adj. (让某人)保持......
1. I am sorry to keep you _________ (wait) so long.
2. We must always keep our classroom _________ (clean).
下订单和取消订单
waiting
clean
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 online. The whole world is connected. The Internet is making the world smaller, like a village.
Paragraph 2
形成，产生
connect A with B 使A与B连接
多亏，由于
经商，做生意
instead of doing sth. 而不是/代替做某事
Paragraph 3
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.
for instance =for example 例如（后有逗号，常接句子）
用来举例说明某一论点或情况，一般只举同类人或物中的“一个”为例。
such as 例如 （后无逗号，常接名词或短语）
用来列举事物时，一般列举同类人或事物中的几个例子。
1. I like fruits, _________________ apples, pears and bananas.
2. _________________, Japan has a lot of earthquakes.
such as
For instance/For example
辨析： besides，except 和 but
① besides 除......之外(包括......在内)
② except =but 除......之外(不包括......在内),
except后跟副词、介词短语时,不能用but代替。
1. ________ English, we learn math, Chinese, politics and some other subjects.
2. All the students come to school ________ Tom because he is ill.
3. The window is never open ________ in summer.
Besides
except/but
except
But _______ have some disadvantages.
For example ,
We can use ____ to do sth
_____ can help us do sth
Thanks to _______ ，we can…
With the help of _______, we can …
______ have many advantages.
In short, _____ are very helpful, we must use them correctly.
How to write a composition about computers
For instance,
What’s more ,
Besides ,
Body:
Beginning:
Conclusion:
There is no doubt that______play an important part in our daily life.
/ As we know ,_________ are very useful in our daily life.
/ _______ have changed our lives .
/_________ have improved our lives ,but they brought some problems.
In a word, _____are very helpful, they must be used properly.
提示作文
现在越来越多的中学生拥有了自己的手机。某英语报社对学生使用手机（cellphones）的利弊做了调查，结果利与弊如下：
利 1.与父母、朋友联系快速；
2.在线聊天、发短信（message）；
3. 听音乐，玩游戏，拍照；
弊 1.花费太多时间玩游戏；
2.没有认真听讲，学习差；
3.使用手机太久，对健康有害；
建议 1.在校不许使用手机
2.应该好好学习
要求（1）包含所提示内容，语言流畅，内容可适当补充。
（2）字数90词以上。首句已给出。
__________________________________________________________
—————————————————————————————
You can write like this:
As we know ,cellphones are very popular. They play an important part in our daily life.
They have many advantages. For example, cellphones can help us keep in touch with our friends and parents quickly. We can use cellphones to chat on line and send short messages. With the help of cellphones, we can listen to music ,play games and take photos.
But they have many disadvantages. For instance, some students spend too much time playing games. What’s more, some students don’t listen to the teacher carefully so that they do badly in their study. Besides, if we use cellphones too long, it’s bad for our health. As a student, I think we are not allowed to use cellphones in the school, we should study well.
In short , cellphones are very useful, we should use them properly.
2 Write a short passage with the title One Day Without Computers.
The following information may help you.
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…
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.
You can write it like this:
Find out these phrases from the text.
in the 1950s
there’s no doubt +that从句
with the help of sb. = with one’s help
1.在20世纪50年代
2.毫无疑问
3.在某人的帮助下
4.让某人一直做某事
5.出现
6.多亏了某人
7.而不是做某事
8.例如
9.太多（+不可数名词）
keep sb. doing sth.
come into being
thanks to sb.
instead of doing sth.
for instance = for example
too much + 不可数名词
summary
We learn: 1. Some words: doubt, tiny, inside, brain, cancel, connect
2. Some phrases: no doubt, for instance
3. Some sentences:
(1) There is no doubt that computers are very
useful in technology and business.
(2) Computers help us at work and at home, but
they must be used properly.
We can: 1. Talk about the importance of computers.
2. Write a composition by using our imagination.
1. I like the boy. The boy always help others.
I like the boy __________always helps others.
2. Shenzhou X is a spaceship. It was launched with three astronauts in 2013.
Shenzhou X is a spaceship __________was launched with three astronauts in 2013.
3.China is a great country. China has about 5000 years of history.
China is a great country__________ has about 5000 years of history.
4. In factories, robots are controlled by computers.
Robots are controlled by computers are like human brains.
In factories, robots are controlled by computers__________ are like human brains.
who/that
which/that
which/that
which/that
用who, which 和that填空。
Homework
Read 1a.
Memorize the useful expressions and key sentences which we learn today.
Finish Section C in your workbook.
Preview Section D.
Write a short passage with the title One Day Without Computers.
Thank you !

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