人教版高一英语必修二 Unit 3 Computers reading 课件（共16张PPT）

(共16张PPT)
Unit3 Computers WHO AM I?
Reading

How to find the topic sentence?

Exposition 说明文
Topic sentence
thinking?
How to find it?
What is topic sentence?
Over time I have been
changed
quite a lot
1642
The computer began as
a calculating machine.
1822
The analytical machine
was made by Charles
Babbage.
1936
Alan Turing’s
universal machine
1940s
The computer had
grown as large as a
room
1960s
Family of computers
was connected to each
other.
1970s
PC & laptop were used in offices and homes.
Now
Computers
connect people
all over the
world together.
transistors
chips
network
World Wide Web
These
changes
only became
possible
as my
memory
improved
tubes
I have a memory like an elephant.
= I have a good memory and will never forget
things.
APP
Since the
1970s
many
new applications
have been found
for me
communication
trade
medical operations
space rockets
mobile phone
robots
Finance
APP
Supporting details

calculating machine
analytical machine
universal machine
PC
laptop
memory
tubes
transistors
chips
network
WWW
communication
finance
trade
robots
space rockets
mobile phone
medical operations
1. Over time I have been changed quite a lot.
2. These changes only became possible as my memory improved.
3. Since the 1970s many new applications have been found for me.
history
development
uses
main idea of the text
This text told us the _______ and the ______________ of computers , mainly to express its widely _______.
Topic sentence
Main idea
history
development
uses
Exercises time
Homework
Reading material
Find out the topic sentence for each paragraph.
Write down the main idea of the text.