(共23张PPT)
Unit 2 Saving the Earth
Topic2 All these problems are very serious.
Section A
1.a (large) number of … 许多的+可数名词复数
做主语时谓语动词用复数。
the number of … ….的数量 +可数名词复数
做主语时谓语动词用单数。
①There ___(be) ________________________
(许多学生) in our school.
②______________________(学生的数量) ____(be) about 2000.
2. although 相当though ,但although较正式。 although, though 不与but, however 同时使用，但可与yet, still 连用。加强语气时，常用even though, 而不说even although.
a (large) number of students
The number of students
are
is
返回
walk down/along 沿着…走
as a result 结果
a lot of rich land 大量肥沃的土地
change into …转换成 (change… into...把..变成…)
affect the weather 影响天气
stop / prevent /keep sb/sth from doing sth 阻止某某做某事
7. blow.. away 吹走 blow---blew –blown
8. be saved 被储存 9. human being 人类 (human beings)
10. protect the environment 保护环境
11. earth 泥土 / 地球 on the earth 在地球上
12.wash …away 将…冲走
13.different types of (=kinds/sorts) 各种…
14.the reasons for … …的理由/原因
15. live a happy/quiet life 过着快乐/平静的生活
16.trees left 剩下的树
e into being 开始存在，产生。
The first computer came into being in 1946.
18.be in danger (of) 处于(…的)危险中
19.die out 灭绝 die—dying
20.plenty of…= a lot of …=lots of …许多的 + 可数名词复数/ 不可数名词/集体名词
21.the importance of protecting animals
保护动物的重要性 (adj. important)
22. come to understand 开始知道
(come to do sth开始/逐渐做某事)
1.The wind outside is blowing strongly.
2.The wind is so strong.
3. A lot of water can ____________ (被储存) forests.
4.What bad weather! (同义句)
=______ ______ the weather is !
5.I couldn’t see anything. (同义句)
=___________________.
6.__________(砍倒) trees _______________
(对…有害) _____________ (人类).
=_____________________________________
_____________________________.
7.They can also stop the water from
________ the earth________.（冲走）
8. The number of the students ___about 2000.
9. A large number of kids _____ playing games.
10.There are fewer trees _______(剩下的).
be saved by
Check
How bad
I could see nothing.
Cutting down
is harmful to/
does harm to/
is bad for
human beings
washing away
is
are
left
It’s harmful to human beings, animals and plants to cut down trees.
pollution
many trees
cut down
forests gone
wash the earth away
冲走
change into desert
转换成，变成
沙漠
e.g. A lot of rich land has changed into desert because people have cut down too many trees.
sandstorms
come into being
n. 沙尘暴
3 Do you know how sandstorms come into being Number
the pictures and talk about the sandstorm in groups.
( )
( )
( )
( )
( )
( )
4
1
5
3
6
2
wash the earth away
many trees
change into desert
forests gone
sandstorms come
into being
cut down trees
2 Complete the sentences with the correct forms of the given phrases in the box.
as a result, change into, do something,
stop…from, blow…away
1.People have cut down such a large number of trees that
the land _____________________desert.
2.There are fewer trees left, so the wind always _______
the earth ________.
3.Air pollution has become a serious problem, so we must
______________ to reduce it.
4.we should try our best to _________ people ________
cutting down the trees.
5.In the future, human beings can protect the trees well.
_____________, animals will live a happy life in the forest.
has changed into
blows
away
do something
stop
from
As a result
1a Listen, look and say.
The boy and girls are
talking about —————.
different types of sandstorms
the reasons for sandstorms
sandstorms in different cities
1b Listen to 1a and choose the best answer.
Focus on the main idea of the conversation when you listen for the first time.
√
Listen and answer the questions
1.What’s the weather like today
It’s bad. The wind is so strong . And the sand really
hurts face.
2.What causes these sandstorms
People have cut down too many trees.
As a result, a lot of rich land has changed into desert.
3.Do we still need to do something to protect the
environment
Yes, we do. Although we have built “The Green Great
Wall”, we still need to do something to protect the
environment .
conj. 虽然，尽管，即使
n.沙
1c Read 1a and complete trees’ functions.
Trees can stop the wind from blowing the earth away.
A lot of water can be saved by forests.
They can also stop the water from washing the earth away.
Tree’s functions
4 A. Listen to the passage and circle the phrases you hear.
become weaker
destroy the environment
disappear rapidly
on the earth
enough bamboo to eat
4 B. Listen again and fill in the blanks.
1. Now some kinds of animals are becoming
______ ______ _______.
2. Some animals are_____ ______ ____dying out
completely.
3. In the past, pandas lived a quiet life and had
________ ______food.
4. Humans have _____ _____ __________ the importance of protecting animals.
5. We should ______ ______ ____to protect them.
do our best
in danger of
plenty of
come to understand
fewer and fewer
15. live a happy/quiet life
16.trees left 剩下的树
e into being 开始存在，产生。
The first computer came into being in 1946.
18.be in danger (of) 处于(…的)危险中
19.die out 灭绝 die—dying
20.plenty of…= a lot of …=lots of …许多的 + 可数名词复数/ 不可数名词/集体名词
21.the importance of protecting animals
保护动物的重要性 (adj. important)
22. come to understand 开始知道
(come to do sth开始/逐渐做某事)
K: wind; sand; anything
M: sandstorms
J: cut down; as a result; change into
M: affect
J: stop…from…; blow… away
K: can be saved
J: wash … away
K: is harmful to; although; do something
Act out the dialog in pairs
We learn: 1.Some words: sand, although
2.Some phrases: change into, human being
3.Some sentences:
(1)As a result, a lot of rich land has changed
into desert.
(2)Trees can stop the wind from blowing the
earth away.
We can: 1. Use the indefinite pronoun and adverb.
2.Talk about the sandstorm and its harm.
Summary
Assignment
Read 1a.
Memorize the useful expressions and key sentences which we learn today.
Finish Section A in your workbook.
Preview Section B.
Thank you!(共23张PPT)
Unit 2 Saving the Earth
Topic 2 All these problems are very serious.
Section C
词组
1.live on the earth 居住在地球上
2.during this period 在这一期间
3.change… a lot 很大改变…
4.be good for…对…有好处 be bad for对…有害处 be good at…擅长…
5.while ①.然而 表对照关系
eg: Her sister likes reading while she likes singing.
②当…时候
eg: While I was doing my homework, my mother was cooking.
③一会儿， for a while
6. all / around over the world 全世界
7.take away 拿走，取走，带走 take off起飞；脱下
8.be dead 无生气的，生气沉沉的be dying垂死的
9.in the ozone layer 在臭氧层中
10.pass through 穿过，通过
(past 介词为“经过”go past the park和名词为“过去”in the past）
11.make a very big hole 形成一个大洞
12.reach the earth directly 直接到达地球get to=arrive at/in ②搞得着； ③达到
13.cause cancer 致癌 (n. the cause of …的原因)
cause problems/trouble导致问题
14.form ① 形成 form a blanket 形成一张地毯
② 种类，形式 (名词）= kind
Eg：Different countries has different forms of government .
15.the greenhouse effect 温室效应
16.the level of …. ….的水平
17. rise-rose-risen
15.refer to 涉及，谈及
(referred-referred)
(1)________ of us knows how to stop the bad behavior.
(2) I knocked on the door but ___________ answered.
(3) Some of these books are better than__________.
(4) She was driving the car with one hand and wiping the window with the _______.
(5) They are beautiful but I am looking for ___________ useful.
(6) Is there ___________ you can do to help her
(7) There’re 5 000 people living here and almost _________has his/her own car.
(8) He’s cleverer than ____________ I know.
(9) I’ve looked __________ but I can’t find it.
Fill in the blanks using something, anything, others, nobody, everyone, anybody, everywhere, none, other.
Review
None
nobody
others
other
something
anything
everyone
anybody
everywhere
In our daily life, we should face more environmental problems.
Can you say something about them
cities, pollute,
health problems
factories, the land and the air, dead
In our daily life, we should face more environmental problems.
Can you say something about them
cut down, millions of,
take away the earth,
become desert
拿走
In our daily life, we should face more environmental problems.
Can you say something about them
oxygen
a special kind of oxygen
called “ozone” (O3)
氧气
a very big hole in the ozone layer,
too much harmful radiation from the sun
臭氧层
放射，放射物
n.洞，坑
v.出现，形成
n.种类，形式
In our daily life, we should face more environmental problems.
Can you say something about them
CO2 carbon dioxide increase a lot, form a “blanket”, the heat from the sun can’t escape
二氧化碳
毛毯，毯子
渗出；逃跑；逃脱
cause the level of the sea to rise
called “the greenhouse effect”
or “global warming”
v.上升；起床；升起
温室效应
fewer trees
factory pollution
traffic pollution
the ozone layer
more carbon dioxide
Can you match them
1a Read and understand.
Look at the following pictures and predict the main idea of the passage.
Choose suitable titles for Paragraphs 2-6. Then write it down in front of each paragraph.
The earth is 4.6 billion years old. We humans have lived on the earth for only 35 000 years, but during this period, we have changed our planet a lot in many ways. Some things we’ve done are very good for the earth while some are bad.
_________ All over the world, people have cut down millions of trees. When it rains or when the wind blows, the earth is taken away. Forests have become deserts, so many kinds of animals and plants are disappearing.
Fewer Trees
A. Traffic pollution B. Factory pollution C. Fewer trees D. The ozone hole E. More carbon dioxide
____________ In big cities, cars and buses have polluted the air. Now many people in cities have health problems.
_____________Factories have also polluted the land and the water. As a result, many rivers and lakes are now dead.
_____________ Around the earth, there’s a special kind of oxygen called “ozone”(O3). It is important to the earth. But now air pollution is destroying it and making a very big hole in the ozone layer. Too much harmful radiation from the sun passes through the hole and reaches the earth directly. This is very dangerous because this kind of radiation can cause cancer.
Traffic Pollution
Factory Pollution
The Ozone Layer
直接地
________________ Carbon dioxide (CO2) in the air has increased a lot. It mainly comes from burning oil, coal and wood. This has formed a blanket around the earth. The heat from the sun can’t escape so the temperature is rising. This is called “the greenhouse effect”. It causes the level of the oceans to rise and the climate of the earth to change.
All these problems are very serious, so we must do something now.
More Carbon Dioxide
1b Read 1a and complete the following tasks.
2.What does our planet mean here
A. The sun. B. Mars.
C. The moon. D. The earth.
3.In the passage, blanket refers to ____.
A. carbon dioxide around the earth
B. the ozone layer in the sky
C. the forests around the world
D. pollution all over the world
4.The word it in Paragraph5 refers to ____.
A. CO2 B. O3 C. O2 D. H2O
5. What is the best title for this passage
Environment Problems B. Pollution on the Earth
C. Hope for the Future D. The Greenhouse Effect
1a Read and understand.
Write down only the key words when taking notes.
1c Complete the notes according to 1a.
Problem Effect on the environment
fewer trees forests become deserts, animals and plants disappear
traffic pollution
greenhouse effect, level of oceans rising, climate change
Retell it
cars and buses pollute air, health problems
pollute land and water, rivers and lakes dead
harmful radiation reaches the earth, cause cancer
factory pollution
ozone hole
more CO2
2 Surf the Internet to collect more information about environmental problems and effects. Then discuss the information in groups and take notes.
3. Combine the key points in 1c and 2 to form a short passage and pay attention to the proper linking words.
As we all know, water pollution is becoming more and more serious. Some factories pour waste water into the rivers. As a result, it makes the water dirty and smell terrible. Most of fish in the water have died and we can’t swim in the water. Water is very important to human beings, so we should do our best to protect and save it. Luckily, our government is taking measures to protect the water from pollution.
You can write it like this:
Thank you
