人教版新课标高中英语必修2unit3_课件

While-rБайду номын сангаасading(1):skimming
1. Who is the speaker –“I”—in this story? “ I ” am a _c_o_m__p_u_t_e_r_ .
2. What’s the main idea of this passage? A. The development of computers. B. The development and use of computers. C. A machine which is simple-minded. D. Computers may replace human beings.
Quiz 1 True or False
1. My real father was Charles Babbage, who wrote a book and built me in 1936. 2. After I got my new transistors in the 1960s, I became smaller but cleverer and quicker. 3. I was brought into people’s homes in the 1970s. 4. Since my birth I have been built to take the place of the human race.
Many new applications have been found for computers.
Now: Computers connect people all over the world
together.
Look at these inventions. Can you put them in an order according to the time when they appeared? After reading the passage, check to see if you are right.
1642: The computer began as a calculating machine.
1822: The Analytical Machine was built by Charles Babbage.
1936: The computer grew rapidly both in size and
5. I began as a calculating machine in Japan in 1642. 6. In 1936, I grew rapidly both in size and in brainpower. 7. As time went by, I was made bigger. 8. Since the 1970s many new applications have been found for me.
Para.2 Topic sentence
Those changes only became possible as my
memory improved
▪tubes
Supporting details
▪transistors ▪chips
▪network
▪World Wide Web
While-reading(3):
I can also be used for watching DVD,
sending e-mail and communicating thnrootuegbhoothkecIonmteprunteetr. However, I am n(olat patPoCp),笔be记ca本u电se脑I’m small enough for
you to take me with you.
Do you know who I am?
What do they have in common?
1.They can be used for calculating. 2.They can deal with maths problems. 3.They are useful and helpful.
robot
artificial intelligence
Nowadays computers play a very important role in our daily life.
Do you know about computers？
Components of a Computer
3. The text is written in an order of _t_im__e_ .
While-reading(2-3) careful-reading
Scanning to get
detailed information
While -reading(2):scanning
timeline
warming up
Guessing
Do you know who I am?
I am very old now. I was born in China. Many people used me for
calculating in the past, baubtancowusI
am a bit lonely because they don’t use me often now.
3. Many new applications have been found for me, such as communications finance/ trade/ robots/ mobile phones/ medical operations/ space Rockets.
While-reading(3):
( 2 ) analytical machine ( 1 ) calculating machine ( 6 ) robot ( 4 ) PC ( 3 ) universal machine
( 5 ) laptop
The history of computers
abacus
calculator
What’s next?
robot
huge computer
PDA
PC laptop
While-reading(3):careful reading
Read the passage again carefully and finish
Ex. 2 on P19 in the student book.
Para.1 Topic Sentence
screen 屏幕 monitor 显示器
host 主机
speaker 音响
keyboard 键盘
mouse 鼠标
Look at these pictures and guess what they are.
a calculating machine
analytical machine
universal machine solve difficult mathematical problems
Who am I?
I am very big. Scientists use me to solve some mathematical problems. huge compDuoteyrou know who I am?
巨型计算机
I can be used for calculating. Besides,
computer as large as a room
Look at these inventions. Can you put them in an order according to the time when they appeared? After reading the passage, check to see if you are right.
Do you know who I am?
I am very small. I can be used for calculating. In Ch计in算a,器a lot of students use me when solving mathematical problecmaslc. ulator
Quiz 2
1. Who was the first person to make the
earliest computer?
A. Alan Turing. B. Charles Babbage.
C. Charles Turing. D. Alan Babbage.
2. When was the “universal machine” built?
A. About 170 years old.
B. About 270 years old.
C. About 370 years old
( ) analytical machine ( ) laptop ( ) calculating machine ( ) robot ( ) PC ( ) universal machine
Reading
WHO AM I?
While-reading(1)
Skimming to get
general ideas
in brainpower. (Universal machine)
1940s: Computer had grown as large as a room.
1960s:The first family of computers was connected by a network.
1970s: Computers were used in offices and homes.