Unit 5 Look into Science Lesson 25 Let's Do an Experiment! 课件(共19张PPT)

(共19张PPT)
Unit
5
Look
into
Science
Lesson
25
Let’s
Do
an
Experiment
!
We
will
learn
The
new
words:
experiment,
jar,
upside,
pour,
correct,
scientific,
method,
raincoat,
force,
pressure,
conclude
Important
and
difficult
points:
①I
cover
the
top
with
a
piece
of
cardboard
and
hold
it
there.
②I
am
so
sure
of
my
theory
that
Brian
can
do
the
experiment
over
your
head
and
I
know
you
won’t
get
wet.
③The
force
of
the
air
keeps
the
water
in
the
jar.
④It
is
strong
enough
to
hold
the
water.
Do
you
like
doing
experiments
?
Why?
Lead
in
Think
about
it!
·What
kinds
of
experiments
have
you
done
in
science
class?
·If
you
hold
a
jar
that
is
filled
with
water
upside
down，what
will
happen?
experiment
/?k'sper?m?nt/
n.实验；试验
“做实验”可用do/make/carry
out
an
experiment表达。
e.g.
Mr.
Black
is
doing/making/carrying
out
an
experiment
in
physics.
布莱克先生正在做一个物理实验。
experiment
v.做试验，进行实验，常和介词on，with连用。
e.g.
He
is
experimenting
on
frogs.他正在青蛙身上做试验。
Listen
and
imitate
1．Where
does
Danny
think
they
should
do
the
experiment?
2．What
keeps
the
water
in
the
jar?
3．Is
Jenny
sure
of
her
theory？How
do
you
know?
4．Why
does
Danny
put
on
his
raincoat?
5．What
does
Danny
conclude?
Outside.　
The
force
of
air.
Yes,
she
is.
She
asks
Brian
to
do
the
experiment
over
Danny’s
head
and
she
knows
he
won’t
get
wet.
He
is
afraid
that
he
will
get
wet.
He
concludes
that
air
is
stronger
than
he
thought.
Read
the
lesson
and
answer
the
questions.
Language
points
1.
I
cover
the
top
with
a
piece
of
cardboard
and
hold
it
there.
我用纸板把上面盖住然后托住它。
cover…with…意为“用……覆盖……”，
类似句式be
covered
with
表示“被……覆盖”，这是一个系表结构。
e.g.
①My
mother
covered
the
table
with
cloth.
我妈妈用布把桌子盖住了。
②The
bed
is
covered
with
paper.
床上盖满了纸。
turn…upside
down
把……翻转；倒过来
e.g.
Can
you
turn
the
glass
upside
down?
你能把这个玻璃杯倒过来吗？
反义短语为：turn...right
side
up
把……正面朝上。
e.g.
Turn
the
box
right
side
up,
please.
请把这个盒子正面朝上放。
2.Then
I
turn
the
jar
upside
down
and
take
my
hand
off
the
cardboard.
Language
points
take
off
脱掉，摘掉，(飞机)起飞
e.g.
Bill
took
off
his
glasses.
比尔摘掉了他的眼镜。
The
plane
will
take
off
at
2：00
p．m.
飞机将在下午两点起飞。
take…off…
把……从……拿开
Language
points
3.
I
am
so
sure
of
my
theory
that
Brian
can
do
the
experiment
over
your
head
and
I
know
you
won’t
get
wet.
我对布莱恩在你头上做实验的理论很有把握，并且你不会湿的。
be
sure
of意为“对……有把握”；
that
Brian
can
do
the
experiment
over
your
head是定语从句，修饰前面的名词theory。
e.g.
①Are
you
sure
of
this
matter?
你对这件事情有把握吗？
②This
is
the
book
that
I
borrowed
from
the
library.
这是我从图书馆借的书。
Language
points
4.
It
is
strong
enough
to
hold
the
water.
它力量很大足以把水托住。
enough
to
do…意为“足以……做某事”，
这里的enough起副词作用，用在形容词或副词后作状语。
e.g.
Allan
is
old
enough
to
go
to
work.
艾伦到上班年龄了。
2.
Read
the
experiment.
Put
the
sentences
in
the
correct
order.
□Put
a
piece
of
cardboard
over
the
jar.
□The
jar
of
water
is
upside
down，but
the
water
stays
inthe
jar.
This
is
because
air
pressure
pushes
the
cardboard
onto
the
jar.
□Fill
the
glass
jar
with
water.
□Turn
the
glass
jar
over
quickly.
Hold
your
hand
on
the
cardboard
for
a
few
seconds.
□Remove
your
hand
from
underneath
the
jar.
What
happens?
□There
is
more
air
outside
the
jar
than
inside，so
there
is
more
air
pressure
outside
than
inside.
2
5
1
3
4
6
Let's
Do
It
!
3.
Try
to
do
the
experiment
in
this
lesson
yourself.
Task
tips：
What
happens
when
you
use
less
water，
more
water，wet
cardboard，or
different
kinds
and
sizes
of
jars?
Let's
Do
It
!
4.
Listen
and
sing
along.
Let's
Do
It
!
make
observations
观察
e.g.
While
doing
experiments，you
must
make
careful
observations.
做实验时，你必须仔细观察。
make
observations还可意为“作评论”。
e.g.
Mr.
Wang
made
some
useful
observations
on
the
Internet.
王老师在网上作了一些有用的评论。
一、根据句意及首字母或汉语提示补全单词
1．It’s
the
best
m________
of
working
out
the
math
problem.
2．I’m
sure
that
the
f________
of
the
air
will
keep
the
water
in
the
jar.
3．Can
you
help
me
________
the
mistake
that
you
find?
4．Put
on
the________
(雨衣)for
it's
raining
heavily.
5．Don't
turn
the
cup
________
(上部)down.
ethod　
orce
correct
raincoat　
upside
Exercises
二、单项选择
1．Tom
is
covering
the
cup
________
a
piece
of
paper.
A．for
B．on
C．with
D．in
2．I
won’t
force
anybody
________
anything.
A．do
B．does
C．to
do
D．Doing
3．Mum
wants
to
watch
CCTV
news.
Let’s________
the
TV.
A．turn
down　　B．turn
on　　C．turn
off
C
C
B
Exercises
4．He
________
my
wet
boots
and
made
me
________
by
the
fire.
A．took
off;
sitting
B．took
off;
sit
C．put
off;
sit
D．put
off;
sitting
5．
—Excuse
me,
do
you
know________？
—About
five
minutes’
walk.
A．where
the
hospital
is
B．how
far
the
hospital
is
C．how
I
can
get
to
the
hospital
B
B
Exercises
三、连词成句(注意词形变化)
1．got，the，boy，rainy，in，wet，the(.)
_________________________________________
2．red，with，the，is，basket，apples，fill，big(.)
_____________________________________________
3．his，brother，covered，hands，face，with，his，my(.)
_____________________________________________
4．five，am，she，sure，minutes，come，in，will，I(.)
____________________________________________
5．doing,
the
students,
in
the
lab,
an
experiment,
are(.)
____________________________________________
The
boy
got
wet
in
the
rain.
The
basket
is
filled
with
big
red
apples.
My
brother
covered
his
face
with
his
hands.
　
I
am
sure
she
will
come
in
five
minutes.
The
students
are
doing
an
experiment
in
the
lab.
Exercises
Homework
1.Recite
the
text.
2.Preview
Unit
5-Lesson
26.
Bye-bye!