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Unit 9 Saving the earth
一、教目标与要求
通过本单元习，生
了解地球当今所面临的重大污染问题。如对空气、水的污染现状和造
成的严重后果；了解
人类活动对我们周围环境造成的破坏，以及对动物生存造成的极大威胁，
使生能更好地树
立环保意识。生能用英语描述以上内容，并通过讨论，得出自己的看法和人
类应采取的措
施。使英语习和语言能力的提高与增强环保意识结合起来；通过对话课的习与
操练，生复
习有关表示同意和假设的用语；习并初步掌握过去分词作定语和表语的用法；正
确完成练
习册安排的练习。
二、教重点与难点
1
．
重点词汇
damage
；
pollute
；
pollution
；
cause
；
sight
；
present
；
pour
；
living
；
proba
－
bly
；
separately
；
unclear
waste
；
be fit
for
；
hear about
；
turn…to…
；
time and
time again
；
lose
one’s sight
；
so
that
；
die
out
；
go
off
；
point
to
；
to one’s
joy
2
．
重要句型
1
）
It
is said that 125 000 people died in Russia as a
result of illnesses caused by
this
accident
．
2
）
Oceans are able to clean
themselves
，
but
certain seas
，
once they become
dirty
，
are not
able to do so
．
3
）
There are many
reasons for animals dying
out
，
but the most important
one
is the part that humans have
played
．
3
．语法
过去分词作定语和表语（
The
Past Participle as Predicative and Attribute
）
1
）
Polluted rivers and lakes have also
been a cause of death
．
2
）
One
suggested answer is for farmers
to
limit the numbers of their
cattle
．
3
）
Another problem is that good soil is
gradually lost
．
4
）
One
quarter of
the shores of the Mediterranean are
polluted
．
4
．
日常交际用语
同意和假设
（
Agreement
and supposition
）
1
）
It’s a good
idea to hold such
conferences
．
2
）
Yes
．
If we go on polluting the
world
，
it won’t be fit for us
t
o live
in
．
3
）
I agree
with
you
．
We’ve got to
do something about the
pollution
．
It’s
getting worse
．
4
）<
/p>
Yes
，
it
certainly
is
．
If people don’t stop polluting the seas
and rivers
，
there
will be no fish left
．
5
）
That’s quite
true
．
三、课型
（一）对话课
Ⅰ．教具
录音机、投影仪。
Ⅱ．课堂教设计
1
< br>．教师通过向生提出下列问题导入本课：
Do you
think the world is facing a lot of
problems
？
If you do
，
please think about these
problems
．
What are
they
？
由生讨论以上问题，引出有关防止污染、保护地球的话题。
<
/p>
2
．
准备放对话录音。
< br>借助授影片打出以下听前提问：
1
）
What was the conference about
？
2
）
What did Jackie do at the
meeting
？
放录音一至两遍，请生回答上述问题，教师予以必要订正。
<
/p>
Key
：
1
）<
/p>
The conference was about the
damage that is being caused to the
world
．
2
）
Jack
－
ie listened
to some lectures about pollution and so on at the
meeting
．
根据本课对话内容
，教师再提出一些问题，检查生的理解程（可参阅练习册所列内容）。
3
．再次放对话录音，生跟读。将生分为两人一组练习对话。数分钟后，请两三
组同到前
面表演。
教师指导生归纳本课中有关同意和假设（
Agreement and supposition
）的常
用语句（见日
常交际用语部分）。
组
织生两人一组，练习书上
Practice
中所安排的练习。<
/p>
4
．要求生将本课对话改写为一篇短文
，描述
Jackie
参加会议所涉及的内容。教师可给予
必要的提示。
提示语
（用投影仪打出）
：
1
）
What conference did Jackie
attend
？
2
）
What was it about
？
3
）
What did they do at the b
eginning
？
4
）
What opinion did Jackie have after attending
the
conference
？
5
）
Say
something about the talk on the increase in the
world’s population
．
将首句给出：
Jackie is talking to
Yang Pei about a conference he has just been
to
．
要求生根据对话，参照老师所
给的提示及首句编写短文，当堂要求生完成。数分钟后，
请几住同朗读自己的短文，教师
予以讲评。
Model
：
Jackie is talking to Yang Pei about a
conference he has just been
to
．
The
conference was
called“Saving the
earth”
．
It was
all about the damage that is being caused to the
world
．
Jackie and
the other people listened to some
lectures about pollution
，
agriculture
，
nuclear waste
，
radiation
and so
on
．
Jackie
believes that if people go on polluting the
world
，
it won’t
be fit for man to live
in
．
They also had
a talk about the increase in the world’s
population
．
Jackie learns
that if the
population keeps growing so
quickly
，
there
will only be standing room left for man next
century
．
5
．布置作业
1
）预习第
34<
/p>
课；
2
）完成练习册中安排的练习。
（二）阅读理解课（Ⅰ）
Ⅰ．教具
录音机、投影仪、数张有关环境污染的图片或照片。
Ⅱ．课堂教设计
1
．检查生词及短语。
2
．教师通过以下提问导入正课：
What kind of pollution can you think
of
？
出示准备好的图片或照片，启发同讨论。
3
．准都阅读课文。教师给出读前提问：
1
）
Why
are trees very important
？
2
）
What is
the cause of water
pollution
？
教师给生数分
钟，要求生快速阅读课文，之后请同回答上述问题。
Key<
/p>
：
1
）
Beca
use trees can hold the soil in place on the hillsi
de
．
2
）
W
aste from factories and
cities is the
cause of water pollution
．
4
．放课文录音，生跟读一至两遍。教师用投影仪打出以下
statements
，要求生判断其正
误，并
对错误的
statements
进行修改。
1
）
The passage points out that many parts
of the world with large populations and
plen
－
ty of
crops
have become deserts
．
2
）
Land may become poor if farmers do not
limit the num
－
bers of
their cattle
．
3
）
Good soil is gradually lost these days
as trees are being cut down
．
4
）
Air pollution
and water pollution are the two causes
of the problem that many parts of the world have
become
deserts
．
5
）
Chemicals in the smoke from power
stations can travel
hun
－
dreds of miles in the
wind
before falling down to the ground
in the rain
．
However
，
the rain will not do any harm to
man
．
6
）
After a bad accident at a nuclear power
station
，
50
％
of
the trees in Germany were damaged
．
7
）
The examples of the
accidents in both India and Russia are used by the
writer to explain how water
is
polluted
．
8
）
Once oceans are
polluted
，
they
are not able to clean
themselves
．
Key
：
1
）
True<
/p>
．
2
）
True
．
3
）
Tru
e
．
4
）
Fa
lse
．
（
Too many
cattle and too much good soil being
lost are the two causes of the problem
that many parts of the world have become
deserts
．）
5
）
Fal
se
．
（
The chemical
rain can destroy trees in the forests and kill
fish in the lakes
．
）
6
）
False
．
（
These
trees were
damaged by the chemical rain
．
）
7
）
False
< br>．
（
These two examples are
used to explain how
air is
polluted
．）
8
）
False
．（
Oceans are
able to clean them
－
selves
．）
5
．课堂活动
组织生两人一组相互交流。在习本课课文之后，对什么是污染，污染所造
成的危害，我
们应采取的措施等发表看法，然后请生在班上交流。
Work
in pairs
；
exchange ideas on
：
1
）
What
is pollution
？
2
）
The damage of various kinds of
pollution
．
3
）
What steps should people
take
？
4
）
What can we do about
it
？
6
．
布置作业
1
）复述课文，讲述地球当今所面临的重大污染问题；
2
）完成练习册中所
安排的练习。
阅读理解课（Ⅱ）
Ⅰ．教具
录音机、投影仪。
Ⅱ．课堂教设计
1
< br>．通过提问温习第
34
课内容：
1
）
Is the area of
desert growing every year
？
Why
？
2
）
What can be
done to stop land from turning into
desert
？
3
）
What are the causes of air pollu
－
tion
？
4
）
What had happened in Germany by
1986
？
5
）
How many people
died as a result of a
bad accident at a
nuclear power station in Russia
？
6
）
How many
people were killed as a result of a
serious accident at a factory in
India
？
7
）
What happened to an oil tanker off the
north
－
west coast
of Alaska and what was the
result
？
2
．检查课文复述。
3
．准都阅读第
35
课，教师
给出读前提问：
1
）
How
many kinds of living things are there
on the earth
？
2
）
Why
are many animals dying out
？
教师给生两分钟，要求生快速阅读课文，之后请同回答上述问题。
Key
：
1
）
There are five to ten million kinds of
living things on the earth
．
2
）
There are many
reasons for
animals dying out
，
but the most important one has
something to do with human
being
．
4
．
放课文录音，
生跟读一至两遍。
教师提出以下问题，
要求生根据课文内容回答：
1
）
What
happened three billion years
ago
？
2
）
Why
do we say that many living things are
dy
－
ing
out
？
Please explain
．
3
）
What happened
between the years 1550 and 1950
？
4
）
What about by the year
1985
？
5
）
What may happen between 1980 and
？
5
．组织
生根据课文所提供的信息，讨论许多动物濒临灭绝的原因，教师给予必要提示。
Reas
ons for animals dying out
：
1
）
killed for food
2
）
animals’ homes
destroyed
（
e
．
g
．
dry lands… wet
lands…forests…
etc
．
）
3
）
Much land has either been changed to
farmland or used for
building
．
4
）
polluted rivers
and lakes
根据提示，要求生用自己组织的语言，描述许多动物濒临灭绝的原
因。数分钟后，在班
上交流，教师予以讲评。
6
．
教师用投影片打出以下问题，
要求生带着问题阅读
A day in the for
est
这篇短文。
数分
钟后，请几位同
回答，教师予以订正。
1
）
What was the purpose of the trip of the
students to the forest
？
2
）
What were the students
given
when they arrived and what did they have to do
with them
？
3
）
What did the monitor and the
writer decide to find in the
forest
？
4
）
Why
did they put some water into a bottle after
lunch
？
5
）
What was Sun Yao doing when his
classmates found him
？
6
）
Why
were the students excited
？
Key
：
1
）
The
purpose of the trip was to record all the wildlife
and plants that the
stu
－
dents
could
find in the forest
．
2
）
They were given printed question papers
and they had to fill in the
answers in
their notebooks
．
3
）
They decided to find a plant that had
recently been dis
－
covered
．
4
）
They put some water into a bottle after
lunch in order to test if the water was
polluted
．
5
）
Sun
Yao was busy measuring a plant and taking
photographs of it
．
6
）
They were
excited because
they had discovered the plant they were looking
for
．
7
．布置作业
1
）将两课内容结合，描述人类活动对我们周围环境造成的破坏；
2
）完成
练习册中所安排的练习。
（三）语言训练课
Ⅰ．教具
投影仪。
Ⅱ．课堂教设计
1
．教师检查课文复述。
2
．教师从本单元词语中选择部分常用词语，配以例句介绍给生。要求生反
复练习这些例
句，并请同造句，教师予以讲评、订正。
1
）
damage
n
．／
v
．
The earthquake caused great damage to
the city
．
The
bridge was badly damaged by the
flood
．
Soft wood
damages easily
．
2
）
pollute
／
pollution
Many rivers and lakes have been
polluted by industrial
waste
．
The new
law will reduce pollution of the
air
．
3
）
fit
／
be fit for
The dress fitted her
perfectly
．
You
look very fit
，
Mike
．
He is not fit to be a
member of this club
．
It would be months before he was fit
for the job
．
4
）
cause
n
．／
v
．
What was the cause of these
misunderstandings
？
What caused to changed his
mind
？
Do you
think this will cause a lot of
trouble
？
5
）
pour
I poured the milk from the bottle into
the cups
．
It was
pouring all night
．
6
）
die out
This kind of bird is dying
out
．
Tigers would
die out if men were allowed to shoot as many as
they wished
．
7
）
separately
／
< br>separate
The headmaster wished to
see the boys separately
．
Are they joined together or
separate
？
Those
are separate problems and cannot be handled in the
same manner
．
The
river Tweed separates England and
Scotland
．
8
）
so
that
Speak clearly so that they may
understand you
．
He looked down so that she should not
see his eyes
．
3
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