Unit 4 Topic 3 China is the third nation that sent a person into space. Section C 课件(共26张PPT)

(共26张PPT)
Unit 4 Topic 3
China is the third nation that
sent a person into space.
Section C
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
学习目标
Doctors can find diseases easily with the help of computers.
What are the computers used for
For example, tiny computers which are inside patients' bodies can keep their hearts beating normally.
新课讲授
In space, computers have been used to control the speed and direction of a spaceship.
The whole world is connected. The Internet is making the world smaller, like a village.
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 , exercise.or talk with family and friends .
But computers have brought problems, too.
Besides, not everything we read on the Internet is true or good for us.
除此以外
But computers have brought problems, too.
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
Discuss the questions in groups. Then share different ideas in class.
Free talk
1a 1. Tick the fields we use the computer in.
education business
industry communication
daily life medical care
entertainment sports
the title :
The Importance of Computers
1. Predict (预测) the main idea of the passage
Computers are important in our lives.
Guess the main idea from the title:
Underline the topic sentence of each paragraph.
1b
Fast-Reading
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.
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
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 2, and answer the questions.
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
Read Paragraph 3, and fill in the blanks.
1b 2. Complete the following diagram.
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
There is no doubt that we will be successful.
I don't doubt that they will be able to solve the problems.
doubt n. & v. 怀疑，疑惑
(2)doubt (vt.)+ 从句
(3)doubt (vi.)+ about / of
Doubt is the key to knowledge.
There is no reason to doubt of his honesty.
I doubt whether/if he'll change his mind.
(1)doubt (n.)
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。
Language points
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. 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涩。
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，在句子中多用作插人语，用逗号与主句隔开，for example之后也有逗号。for example作插人语，位置可以在句首、句中或句末。
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。
4.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
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。
Retell the passage based on the following diagram.
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 Write a short passage with the title with 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:
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.
课堂总结