人教版高中英语必修二 unit 3 computers warming up课件（共21张PPT）

(共21张PPT)
Book2
Unit
3
Computers
warming
up
Words
about
computers
History
of
development
of
computers
Comparison
among
abacus,
calculator,
PC
and
PDA
Speaking
practice
Summary
on
the
advantages
and
disadvantages
of
using
a
computer
I
am
very
old
now.
I
was
born
in
China.
Many
people
used
me
for
calculating
in
the
past,
but
now
I
am
a
bit
lonely
because
they
don’t
like
me
now.
Do
you
know
who
I
am?
abacus
Guess
:
Part
1
words
I
am
very
small.
I
can
be
used
for
calculating.
In
China,
a
lot
of
students
use
me
when
solving
mathematical
problems.
Do
you
know
who
I
am?
calculator
It
is
a
machine,
which
you
can
use
to
type
your
homework,
draw
pictures,
play
games,
watch
movies,
listen
to
music,
communicate
with
your
friends,
gather
information…
Who
am
I
?
Computer\PC
it
is
a
kind
of
computer
which
can
be
taken
conveniently(方便地)
like
a
notebook.
A
laptop
CPU
(central
processing
Unit)中央处理器
hard
disc硬盘
chips
主板
display
card
显卡
monitor显示器
keyboard
键盘
mouse
鼠标
modem
Scanner
扫描仪
printer
Speaker音箱
CD/DVD/VCD
CD
/
DVD-ROM
光盘驱动器
Components
of
a
computer
Scanner
Printer
Monitor
Mouse
Speaker
内存
Random
Access
Memory
重置
电脑组件
What
do
they
have
in
common?共同点
What’s
next?
abacus
calculator
Huge
computer
desktop
laptop
PDA
Robot
Part2
History
Discussion
and
competition
Use
words
\phrases
to
express
the
advantages
(
优点)and
disadvantages(缺点)
of
abacus,
calculator,
PC,
and
PDA.(用单词,词组来表达abacus,
calculator,
PC,PDA的优点,缺点)
discussion3’+writing
5’
Part
3
Comparison
Abacus
Advantages:
fast,
traditional
,
convenient,
simple
Disadvantages:
too
simple
Calculator
Advantages:
accurate(准确的),
convenient,
convenient
to
carry,
more
useful,
has
more
functions,
like
cos,
sin,
log,
etc
Disadvantages:
people
will
rely
on
it
too
much
PC
Advantages:
personal,
popular,
faster,
intelligent
,more
useful
\usages\
functions,
(surfing
the
Internet,
looking
for
information,
draw
pictures…)
Disadvantages:
too
big
to
carry
,
expensive,
skillful
(it
requires
people
should
know
how
to
use
a
computer)
PDA
Advantages:
compact(小巧的),
useful,
portable(轻便的,方便携带的),
convenient
to
carry
Disadvantages:
the
screen
is
too
small,
it
needs
battery(电池),
….
lose
data(数据)….
Speaking
practice
If
you
decide
to
design
(设计)your
own
house,
which
one
do
you
like
to
use
to
help
your?
abacus,
calculator
,
PC,
PDA?
Give
your
reasons?
Part
4
Summary
Discuss
the
advantages
and
disadvantages
of
using
a
computer
with
your
partner?
Part
5
Advantages:1.surf
the
Internet
2.look
for
information
3.
communicate
with
others
online
4.
make
friends
all
over
the
world
5.
make
free
calls
through
QQ
6.
watch
films,
videos.
7.
draw
pictures
8.
use
Photoshop
to
make
your
photos
more
beautiful
disadvantages:
1…
bad
information
2…
bad
for
our
health,
especially
bad
for
our
eyes
3.
spending
too
much
on
it
will
do
harm
to
our
study.
4.
net
games
....bad
for
our
study
5.
…reduce
the
time
for
real
friends
and
family.
Homework
1.Write
a
composition
about
advantages
and
disadvantages
of
using
a
computer.
2.
Preview
the
reading
passage
“who
am
I
”.