(共77张PPT)
1.
世界奇观
；
2.
2000多年
；
3.
兵马俑
；
4.
三峡大坝
；
5.
巨人之路
；
6.
维多利亚瀑布
；
7.
自然奇观
；
8.
古/现代奇观
；
9.
参加（某种活动）
；
10.
(不)
确定
；
11.
同意某人
；
12.
它们中大部分
；
13.
绵延几百米
；
most
of
them
run
for
several
hundred
metres
wonders
of
the
world
more
than
2000
years
old
the
Terracotta
Army
the
Three
Gorges
Dam
the
Giant’s
Causeway
Victoria
Falls
natural
wonders
ancient/modern
wonders
join
in
be
(not)
sure
agree
with
sb.
14.
在……的东海岸
；
15.
大约1700米宽
；
16.
几公里外
；
17.
按某人的意见；据某人看来
；
18.
人造奇观
；
19.
超过
；
20.
在顶部
；
21.
发电
；
22.
数以百万的
；
23.
谁愿意
；
24.
更感兴趣
；
25.
从某种程度上来说
。
on
the
eastern
coast
of…
about
1,700
metres
wide
a
few
kilometres
away
in
one’s
opinion
man-made
woder
more
than
produce
electricity
at
the
top
millions
of
who’d
like
to
be
more
interested
in对……
to
some
degree
below
shine
sign
silent
silver
sky
grey
prep.
在……下面；在……
以下
v.
照耀
n.
迹象；标志；招牌
adj.
寂静的
adj.
银灰色的；银制的
n.
天；天空
adj.
灰色的；(天气)阴沉的
Words
and
expressions
go
through
beside
reply
clear
fall
away
穿过
prep.
在……旁边；
在……附近
v.
回答；答复
v.
（烟雾等）开始
消失
突然向下倾斜
Words
and
expressions
stream
nearly
on
top
of
canyon
remain
by
n.
小河；小溪
adv.
几乎；差不多
在……上面；盖住
n.
峡谷
v.
逗留；留下
prep.
在……旁边；靠近
Words
and
expressions
sky
n.
天空
grey
adj.
灰色的;
阴沉的
silent
adj.
寂静的
sign
n.
迹象；标志
clear
v.
(烟雾等)
开始消失
fall
away突然向下倾斜
silver
adj.
银色的
shine
v.
照耀
stream
n.
小河；小溪
canyon
n.
峡谷
Guessing
Game!
Can
you
say
the
names
of
these
wonders
of
the
world?
The
pyramids
in
Egypt
tombs
of
the
kings
in
ancient
Egypt
[
tu:m
]?坟墓
They
are
________
___________
wonders.
ancient
man-made
The
Great
Wall
One
of
the
two
man-made
things
that
can
be
seen
from
space.
It
belongs
to
China.
属于
It’s
an
________
___________
wonder.
ancient
man-made
It
is
more
than
6700
kilometres
long.
It
is
about
ten
metres
wide
.
The
River
Nile
the
longest
river
in
the
world
It’s
a
_________
wonder.
natural
The
Himalayas
the
greatest
mountain
in
Tibet
in
Asia
It’s
a
natural
wonder.
The
Grand
Canyon
the
largest
and
greatest
canyon
in
the
natural
world
It’s
in
the
west
of
USA
It's
a
natural
wonder.
1
Work
in
pairs.
Talk
about
a
great
natural
wonder
you
know.
Use
the
words
in
the
box
to
help
you.
below
deep
fantastic
high
long
natural
shine
sign
silent
silver
It
is
8,844m,
so
it
is
very
high/tall.
Mt.
Qomolangma
?[ni'p?:l]
between
Nepal
and
China
It
is
a
natural
wonder.
珠穆朗玛峰
['t???m??,lɑ??m?]
It
is
a
natural
wonder.
It
is
6,
397kms
long,
2
kms
wide
and
150ms
deep.
China
the
Changjiang
River
长江
中国
It
is
4,
280m
deep.
It
is
19,
900kms
wide.
The
pacific
Ocean
It
is
a
natural
wonder.
太平洋
Niagara
Falls
尼亚加拉瀑布
It
is
51m
high.
It
is
a
natural
wonder.
It’s
fantastic.
between
Canada
and
America
[na?'?ɡr?]
1.
What’s
the
great
wonder
of
the
natural
world
the
writer
travelled
to
see?
2.
What
was
the
writer’s
feeling
when
he
saw
the
full
view
of
the
wonder?
The
Grand
Canyon.
It
was
not
just
big.
It
was
huge.
A
great
wonder
of
the
natural
world
When
I
arrived,
it
was
early
morning
and
it
was
raining.
I
looked
to
the
east
–
the
sky
was
becoming
grey.
I
got
out
of
the
car,
went
through
a
gate
and
walked
along
a
dark
path.
There
was
nothing
to
see,
but
I
knew
it
was
there.
After
about
a
mile,
a
stranger
appeared
beside
the
path.
“Am
I
going
the
right
way?”
I
asked.
He
knew
where
I
was
going.
“Yes,”
he
replied,
“you’ll
get
there
in
five
minutes.”
Finally,
I
came
to
some
rocks
and
stopped.
I
looked
over
them,
but
it
was
silent
and
there
was
no
sign
of
it.
Suddenly,
the
rain
stopped
and
the
clouds
cleared.
The
sun
rose
behind
me
and
shone
on
the
rocks.
Far
below
me,
the
ground
fell
away
and
down
to
a
river.
I
was
looking
across
one
of
the
wonders
of
the
natural
world
-
the
Grand
Canyon.
I
looked
down
to
the
Colorado
River,
a
silver
stream
nearly
one
mile
below
me.
If
you
put
the
two
tallest
buildings
in
the
world
on
top
of
each
other
at
the
bottom
of
the
canyon,
they
still
would
not
reach
the
top.
Then
I
looked
across
to
the
other
side
of
the
canyon.
It
was
about
fifteen
miles
away,
maybe
more.
Finally,
I
looked
to
my
left
and
to
my
right,
and
on
both
sides
the
canyon
went
far
away
for
more
than
200
miles.
The
Grand
Canyon
was
not
just
big.
It
was
huge!
I
remained
by
the
canyon
for
about
half
an
hour,
and
I
asked
myself,
“Is
the
Grand
Canyon
the
greatest
wonder
of
the
natural
world?”
I
certainly
know
the
answer.
What
do
you
think?
D
【知识点1】get
out
of意为“下车”，用于(car,
taxi等)小型交通工具；它对应的反义词组为get
into意为“上车”；get
off意为“下车”，用于(bus,
train,
ship,
plane等)大型交通工具；它对应的反义词组为get
on意为“上车”。如：
We
get
of
the
car
and
put
everything
on
the
grass.
我们下了车，把每件东西都放在草地上。
I
saw
Lily
get
out
of
a
car
and
get
into
a
taxi
yesterday.
昨天我看到莉莉从一辆小汽车上下来，然后上了一辆出租车。
They
_______
the
taxi
and
appeared
in
front
of
Jimmy’s
house.
A.
got
off
B.
got
to
C.
got
up
D.
got
out
of
【知识点2】through，across与over的用法辨析：
①through介词，意为“穿/通/横过”，表示动作在某一物体的空间内进行，如穿过森林、沙漠、门、窗户、隧道，光线射入等，可与go,
walk,
get等动词连用。如：
The
ball
went
through
the
window
into
the
room.
这个球穿过窗户飞进屋里了。
The
boy
is
brave
enough
to
go
through
the
forest
all
by
himself.
这个男孩够勇敢，独自穿过森林。
②across介词，意为“穿/通/横过”，表示动作在某个物体的表面进行，如过河，过桥，过马路，常和表示“走”一类的动词（如go，walk，run，fly，jump等）连用。如：
Be
careful
when
you
go
across
the
road.
当你横过马路时要小心。
③over是介词，用作“穿过、通过”时，侧重越过某种障碍物（如树、墙、篱笆和山脉等）。如：
He
jumped
over
the
wall.
他跳过了墙。
He
went
over
the
hills.
他越过了几座山。
1.
Before
the
bridge
was
built
the
river,
the
villagers
had
to
take
a
boat
to
the
other
side.
A.
in
B.
beside
C.
across
D.
along
2.
The
two
boys
went
_____
a
park
and
got
to
their
home.
A.
across B.
through
C.
crossing
D.
cross
B
C
The
little
elephant
is
afraid
to
go
alone.
He
always
walks
his
mother.
A.
besides
B.
beside
C.
below
D.
under
B
【知识点3】beside与besides的用法辨析：
①beside是介词，意为“在……旁边；在……附近”，它相当于next
to。如：
Wendy
came
up
and
sat
beside
me.
温迪走过来，坐在我身边。
This
is
the
school
building.
It
is
beside
the
park.
这是学校大楼，它在公园旁边。
②besides是介词，意为“除了……之外（还有）”。如：
I
have
another
blue
pen
besides
this
one.
除了这支钢笔外，我还有另外一支蓝色的。
People
choose
jobs
for
other
reasons
besides
money.
人们择业除了金钱之外还有别的考虑。
【知识点4】reply与answer的用法辨析：
①reply作及物动词，意为“回答”，后接that从句，可与answer互换；reply作不及物动词，意为“回答”，常与介词to连用，构成reply
to
sb/sth，表示“对……作出回答”，相当于answer；reply作名词，与介词to搭配，意为“对……的答复”。如：
Can
you
find
out
the
answer/reply
to
this
question?
你能找到这个问题的答案吗？
He
replied/answered
that
he
didn’t
know
the
secret.
他回答说，他不知道这个秘密。
②answer一般用作及物动词，意为“回答”，后可直接接宾语，可与reply互换；answer用作名词时，意为“回答；回信；答复”，可与介词to搭配；answer还可表示对电话、敲门等作出的“应答”，常用短语answer
the
door（门铃响了）去开门；answer
the
telephone接电话。如：
Can
you
find
out
the
answer/reply
to
this
question?
你能找到这个问题的答案吗？
B
D
1.
You
should
____
the
teacher’s
question
in
a
loud
voice.
A.
reply
B.
reply
to
C.
answer
to
D.
say
2.
I
called
you
last
night,
but
no
one
______
the
phone.
A.
answers
B.
replied
C.
replies
to
D.
answered
【知识点5】in
five
minutes意为“在五分钟后”。“in＋时间段”，意为“在……之后/之内”，表示以现在为起点的一段时间以后，常和将来时连用，对“in＋时间段”提问时，要用how
soon，意为“多久以后”。如：
He’ll
come
back
in
two
days.
两天后他将回来。
----
How
soon
will
they
arrive?
他们什么时候到？
----
In
half
an
hour.
半小时后。
【拓展】“after＋时间点/时间段”，意为“在……之后/”，以过去时间点为起点，常和一般过去时连用。如：
He
left
there
after
two
days.
两天以后，他离开了那儿。
Mr
Wang
has
left
for
Guangzhou.
He
_______
a
speech
there
in
two
days.
A.
gives
B.
gave
C.
will
give
D.
has
given
----
will
you
finish
doing
the
work?
----
In
a
few
weeks.
A.
How
long
B.
How
far
C.
How
soon
D.
How
often
C
C
【知识点6】rise，raise与lift的用法辨析：
①rise作动词，意为“上升，上涨；增加”，一般指自然界的日、月、星、雾、云等的上升，河水上涨，价格提高等，也指“起床；起立”。主语通常是物，指因自然或非主观因素而上升，不跟宾语。其过去式、过去分词分别为：rose;
risen。如：
The
sun
rises
in
the
east.
太阳从东方升起。
When
does
he
rise
every
day?
他每天几点起床？
Prices
are
rising.
物价在上涨。
②raise作及物动词，后可直接跟宾语，表示举手、升旗，也有饲养、筹集之意。主语通常是人，指人为地使某物提升。如：
raise
one’s
hand
举手；raise
a
flag
升旗；raise
a
stone
搬石头；raise
one’s
voice
提高嗓门说话；raise
the
rate
of
production
提高生产效率。
③lift是及物动词，指用体力或机械动力把某物从地面举起到一定高度。lift
作不及物动词时，可以引申为雾的“消散”。如：
That
package
might
be
too
heavy
to
lift.
那包裹可能太重，搬不动。
He
lifted
the
big
book
off
the
the
floor
and
put
it
on
the
table.
他把那本大书从地板上拿起，放在桌子上。
B
B
1.
We
stood
_____
top
of
the
highest
building
in
our
city
to
see
the
sun
______.
A.
at;
raise
B.
on;
rise
C.
on;
raise
D.
at;
rise
2.
Our
geography
teacher
told
us
the
sun
____
in
the
east.
A.
gets
B.
rises
C.
faces
D.
lifts
【知识点15】below是介词，意为“在……下方/下面/以下”，指处于比某物/某人低的位置，不一定在某物/某人的正下方。below还可用于表示温度、高度以及有纵向标准可比的情况。below的反义词为above，意为“在……上方/上面/以上；比……还高”，只说明物体间的上下位置关系，不接触，也不表示垂直关系。当表示温度、高度以及有纵向可比标准时，通常用above。如：
There
is
a
new
desk
below
the
window.
窗户下有一张新桌子。
This
place
is
below
sea
level.
此地在海平面以下。
The
temperature
is
two
degrees
below
zero.
温度是零下
2
度。
The
town
is
2,000
feet
above
sea
level.
这座城市海拔2,000
英尺。
【拓展】under是介词，意为“在……正下方”，其反义词为over，意为“在……
正上方。如：
There
is
a
cat
under
the
table.
只有猫在桌子下面。
There
is
a
bridge
over
the
river.
河上有一座桥。
D
C
1.
The
weather
report
says
it
will
become
colder
and
the
temperature
will
fall
zero.
A.
under
C.
on
C.
above
D.
below
2.
Ice
is
not
often
seen
here
in
winter
as
the
temperature
normally
stays
zero.
A.
up
C.
down
C.
above
D.
below
时态
一般现在时
一般过去时
现在进行时
过去进行时
一般将来时
现在完成时
用法
表示经常性发生的动作、习惯性动作或客观真理、科学事实等。
表示过去某个时间发生的动作或存在的状态。
表示现在或现阶段正在进行或发生的动作。
表示过去某时正在进行的动作或存在的状态。
表示将来某个时间要发生的动作或存在的状态。
表示过去发生或者未发生的事对现在造成的影响或结果。
构成
方式
1.
动词be
(am
/
is
/
are)
+
表语…
2.
动词原形
+
…
(主语是第三人称单数，动词也用第三人称单数)
1.
动词was/were
+
表语
2.
实义动词的过
去式
+
…
be(am/is/are)
+
动词的现在分词
was
/
were
+
动词的现在分词
1.
will/shall
+
动词原形
(shall
用于第一人称)
2.
be
going
to
+
动词原形
主语
+
have
/
has
+
过去分词
+
…
句
型
变
化
疑
问
式
1.
Be
+
主语
+…?
2.
Do/Does
+
主语+动词原形+
…?
1.
Was/Were
+
主语
+
…?
2.
Did
+
主语
+
动词原形
+
…?
Be
+
主语
+
动词的现在分词
+
…?
Was
/
Were
+
主语
+
动词的现在分词
+
…？
1.
Will/Shall
+
主语
+
动词原形+
…?
2.
Be
+
主语+
going
to
+
动词原形
+
…?
Have
/
Has
+
主语
+
过去分词
+
…？
否
定
式
1.
主语
+
be
+
not
+
…
2.
主语+
don’t
/
doesn’t
+
动词原形
+
…
1.
主语
+
was
/
were
+
not
+…
2.
主语
+
didn’t
+
动词原形
+
…
主语
+
be
+
not
+
动词的现在分词
+
…
主语
+
wasn’t
(was
not)
/
weren’t
(were
not)
+
动词的现在分词
+
…
1.
主语
+
will/shall
not
+
动词原形
+
…
2.
主语
+
be
+
not
+
going
to
+
动词原形
+
…
主语
+
haven’t
/
hasn’t
+
过去分词
+
…
Listen
to
the
tape
and
follow
it.
Then
read
it
together.
Read
the
passage
and
complete
the
table.
The
Grand
Canyon
How
deep
How
wide
How
long
Nearly
one
mile
About
fifteen
miles,
maybe
more.
More
than
two
hundred
miles
long
Some
adjectives
tell
you
facts,
such
as
wide,
deep,
high
and
tall;
some
adjectives
tell
you
the
opinion
of
the
author,
like
wonderful,
huge
and
great.
Learn
to
use
them
to
talk
about
facts
and
give
your
opinion.
1.
Where
does
the
passage
possibly
come
from?
a)
A
magazine.
b)
A
grammar
book.
c)
A
dictionary.
d)
A
story
book.
2.
Why
was
there
nothing
to
see?
a)
Because
there
was
nothing.
b)
Because
it
was
raining.
c)
Because
it
was
too
dark.
d)
Because
it
was
in
the
morning.
3.
Which
direction
was
the
writer
facing
while
he
was
looking
over
the
Grand
Canyon?
a)
South.
b)
North.
c)
East.
d)
West.
4.
What
is
the
writer's
purpose
in
writing
this
passage?
a)
To
give
facts
about
natural
world.
b)
To
say
how
he
feels
about
the
natural
world.
c)
To
tell
an
interesting
story
about
the
Grand
Canyon.
d)
To
attract
people
to
visit
the
Grand
Canyon.
3
Choose
the
correct
answer.
4
Complete
the
passage
with
the
words
in
the
box.
below
mile
remain
reply
sign
silent
sky
stream
through
In
the
dark,
there
is
no
(1)
____
of
the
Grand
Canyon,
and
it
is
(2)
______.
But
if
you
(3)
_______
by
the
canyon
as
the
(4)
____
gets
brighter
and
look
down
about
one
(5)
____,
you
can
see
the
Colorado
River
(6)
______
you.
It
looks
like
a
silver
(7)
________
as
it
passes
(8)
_______
the
rocks
at
the
bottom
of
the
canyon.
If
someone
asks
you
whether
the
Grand
Canyon
is
the
greatest
wonder
of
the
natural
world,
it
may
be
easy
to
(9)
______.
sign
silent
remain
sky
mile
below
stream
through
reply
5
Complete
the
table
with
facts
about
a
natural
or
man-made
wonder
of
the
world.
Interesting
facts
Location
Name
Name
Location
Interesting
facts
1.
It
is
one
of
the
Seven
Wonders
of
the
Ancient
World.
2.
It
is
the
longest
man-made
wonder
in
the
world.
3.
It
is
around
2,145
miles
(3460km)
long,
6-7
metres
high
and
4-5
metres
wide.
4.
The
most
visited
part
of
the
Great
Wall
is
in
Badaling,
close
to
Beijing.
5.
It
has
often
been
compared
to
a
dragon.
6.
A
popular
story
about
the
Great
Wall
is
the
story
of
Meng
Jiangnv.
7.
Reportedly,
it
was
built
over
2,000
years
ago.
It
cost
the
lives
of
more
than
one
million
people.
the
Great
Wall
of
China
in
the
north
of
China
One
possible
answer:
6
Imagine
you
have
just
visited
one
of
the
natural
or
man-
made
wonders.
Write
sentences
and
describe
your
experience.
?
Say
when
you
visited
it.
I
just
visited
the
Great
Wall
last
month.
?
Say
where
it
is.
It
is
in
the
north
of
China.
?
Describe
its
size.
It
is…
?
Say
what
interesting
facts
you
know.
It
is
famous
for…
?
Say
what
happened
when
you
visited
it.
It
was
raining
when
we
were…
?
Say
how
you
felt.
I
thought
it
was
the
most
wonderful
sight.
Now
write
a
passage.
Use
the
sentences
you
have
written
to
help
you.
Name
What
did
you
see
and
do?
How
did
you
feel?
The
location
Some
facts
about
it
How
to
write
a
passage
about
wonders
of
the
world
one
of
wonders
The
Great
Wall
I
visited
the
Great
Wall
last
month.
It
was
a
sunny
day.
My
mother
and
I
took
a
bus
and
went
there
happily.
But
when
we
almost
got
there,
it
began
to
rain
suddenly.
We
felt
very
sad.
As
we
went
on
our
trip,
it
was
raining
harder
and
harder,
we
even
wanted
to
give
up.
Just
at
this
time,
a
long
wall
came
into
my
eyes.
What
a
huge
wall
it
is!
The
Great
Wall
is
one
of
the
great
wonders
of
the
world.
It
was
built
in
the
Qin
Dynasty
and
it
has
a
history
of
more
than
2,000
years.
It
lies
in
the
north
of
China.
The
wall
is
about
6,700
kilometers
long
and
stretches
from
Shanhaiguan
to
Jiayuguan.
The
height
of
the
wall
is
7.8
meters,
and
its
width
averages
out
at
around
6.5
meters
at
the
base
and
5.8
meters
at
the
top.
The
Great
Wall
has
become
a
symbol
of
the
Chinese
nation
and
its
culture.
I
thought
it
was
the
most
wonderful
sight.
小结提升。
这节课我学到了：
本单元主要的单词、短语和句型
Patterns:
Suddenly,
the
rain
stopped
and
the
clouds
cleared.
The
Grand
Canyon
was
not
just
big.
It
was
huge.
Words:
shine
silver
sign
beside
stream
clear
reply
remain
Phrases:
look
over/across/down
get
out
of
fall
away
at
the
bottom
of
一、用括号内所给动词的适当形式填空。
1.
Dan
and
Lingling
________
(reach)
the
island
by
boat
yesterday
afternoon.
2.
—I
think
the
red
dress
________
(suit)
Mrs
Smith.
—Yeah,
she
looks
great
in
it.
3.
—Excuse
me,
can
I
speak
to
Mrs
White,
please?
—Oh,
sorry.
She
________
(go)
to
the
supermarket.
4.
—Why
didn’t
you
answer
my
phone
at
4
pm
yesterday?
—Oh,
I
__________
(climb)
a
mountain
with
my
father
then.
5.
My
brother
John
____________
(arrive)
in
Beijing
in
two
hours.
6.
—Celia,
you’d
better
stay
at
home.
It
___________
(rain)
heavily.
—OK.
reached
suits
has
gone
was
climbing
will
arrive
is
raining
二、句型转换
1.
I
saw
a
lot
of
beautiful
flowers
beside
the
river.
(对画线部分提问)
______
____
you
_____
a
lot
of
beautiful
flowers?
2.
The
new
street
is
about
50
metres
wide.(对画线部分提问)
______
______
____
the
new
street?
3.
I
will
go
to
Canada
to
visit
my
uncle
in
three
days.
(对画线部分提问)
______
______will
you
go
to
Canada
to
visit
your
uncle?
4.
Jack’s
little
sister
likes
to
watch
the
program
Where
are
we
going,
Dad?(改为一般疑问句)
______
Jack’s
little
sister
______
to
watch
the
program
Where
are
we
going,
Dad?
5.
There
was
nothing
to
eat
in
the
fridge.(改为同义句)
There
______
________to
eat
in
the
fridge.
Where
did
see
How
wide
is
How
soon
Does
like
wasn’t
anything
三、单项选择。
1.
They
_____
the
taxi
and
appeared
in
front
of
Jimmy’s
house.
A.
got
off
B.
got
to
C.
got
up
D.
got
out
of
2.
The
moonlight
goes
the
window
and
makes
the
room
bright.
A.
over
B.
across
C.
through
D.
in
3.
The
little
elephant
is
afraid
to
go
alone.
He
always
walks
_____
his
mother.
A.
besides
B.
beside
C.
below
D.
under
4.
You
should
______
the
teacher’s
question
in
a
loud
voice.
A.
reply
B.
reply
to
C.
answer
to
D.
say
5.
Dad
the
USA
in
two
weeks.
A.
is
leave
for
B.
leaves
for
C.
is
leaving
for
D.
left
for
6.
----
will
you
finish
doing
the
work?
----
In
a
few
weeks.
A.
How
long
B.
How
far
C.
How
soon
D.
How
often
D
C
B
B
C
C
A
B
D
C
C
7.
Again
and
again
the
doctor
______
the
crying
baby
girl,
but
he
couldn’t
find
out
what
was
wrong
with
her.
A.
looked
over
B.
looked
after
C.
looked
for
D.
looked
out
8.
We
stood
_____
top
of
the
highest
building
in
our
city
to
see
the
sun
______.
A.
at;
raise
B.
on;
rise
C.
on;
raise
D.
at;
rise
9.
The
weather
report
says
it
will
become
colder
and
the
temperature
will
fall
zero.
A.
under
C.
on
C.
above
D.
below
10.
It
was
______
twelve
when
the
host
left.
A.
at
B.
over
C.
nearly
D.
past
11.
If
Nancy
_____
the
exam,
she
will
go
to
Australia
for
English
study.
A.
pass
B.
passed
C.
passes
D.
will
pass
Homework
1.
读熟U2的短文，记住本节课所学单词、短语、句子和知识点。
2.
记住下节课要听写的单词。
3.
完成本单元练习册的作业。
4.
预习Unit
3。
