Unit+2+Topic+2+Section+C 仁爱版九年级英语上册.pptx

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1、Unit 2 Saving the EarthTopic 2 Section C 学习目标学习目标预习检测预习检测知识梳理知识梳理课堂总结课堂总结学习导航重点探究重点探究当堂当堂检测检测新课导入新课导入Lets know something about O3学习目标学习目标能熟悉并正确运用本课时的重点单词和短语能熟悉并正确运用本课时的重点单词和短语12能能进一步学一步学习各种各种污染染对地球造成的危害和造成地球造成的危害和造成这些些污染的染的原因原因3能根据不同的能根据不同的阅读的目的，运用的目的，运用简单的的阅读策略策略获取信息取信息1.There are many books in the

2、 bookstore_I want to buy none of them.A.when B.what C.while D.that 2.The thief_when the police were talking.A.escaped B.expected C.excused D.encouraged预习检测预习检测CA3.The teachers said that the sun _in the east.A.rose B.rise C.rises D.risen 4.They went_to the hospital to see the man.A.direct B.directly

3、C.hardly D.slow5.I have no time to eat here,so I want to_the food.A.take off B.take up C.take down D.take awayCBD知识梳理知识梳理Key points 1.Some things we have done are very good for the earth while others are bad.我们所做的一些事情对地球有益，然而其他一些对地球却有负面影响。We have done前省略了that,作定语从句，修饰前面的some things.be good for 对有益；b

4、e good at=do well in 擅长;eg:Doing morning exercises is good for our health.做早操对我们的健康有益。He is good at swimming.他擅长游泳。Key points while conj.而，然而，相当于but.表示对比；eg:He is a worker,while I am a teacher.他是工人而我是教师。while conj.引导时间状语；eg:While she was listening to the radio,she fell asleep.她听着收音机睡着了。while conj.引导

5、让步状语从句，意思是“虽然但是”、“尽管但是”(多放于句首)；eg:While he loves his students,he is very strict with them.虽然他爱他的学生，可是他对他们很严格。while conj.引导条件状语，意思是“只要”；eg:While there is life there is hope.只要生命存在，就有希望。while作名词用，表示“一会儿”“一段时间”；eg:She likes to lie down for a while after lunch.她喜欢午饭后躺一会儿。Key points2.The earth is taken a

6、way.泥土被带走。take away 拿走、带走拿走、带走Eg:难道你要拿走他们的铅笔吗？Are you goingt to their pencils?take away Key points3.As a result,many rivers and lakes are now dead.结果，许多河流和湖泊都死了。as a result 因此，结果Eg:因此，他们会非常具有说服力。As a result,they can be very persuasive.be dead 死气沉沉Key pointspass through the hole 穿穿过洞洞 pass through Eg

7、:空气可以通过潮湿的布料。Air will the wet cloth.pass through 4.Too much harmful radiation from the sun passes through the hole and reaches the earth directly.来自太阳的太多有害辐射穿过该孔并直接到达地球。穿穿过Key points5.It causes the level of the oceans to rise and the climate of the earth to change.它导致了海平面的上升以及地球气温的变化。the level of th

8、e oceans 海平面cause 造成、使(发生)cause to doEg:这个坏消息使她伤心。The bad news caused her to be sad.cause sth.Eg:吸烟可导致肺癌。Smoking may cause lung cancer.探究一地球污染问题In our daily life,we should face more environmental problems.Can you say something about them?cities,pollute,health problemsfactories,the land and the air,d

9、eadIn 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 oxygen a special kind of oxygen called“ozone”(O3)氧气氧气In our daily life,we should face more environmental problems.Can you say something about them?a

10、 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CO2 carbon dioxide increase a lot,form a“blanket”,the heat from the sun cant escape二氧化碳毛毯，毯子渗出；逃跑；逃脱In our daily life,we should face more environmental problems.Can you say something about them?cause

11、 the level of the sea to rise called“the greenhouse effect”or“global warming”v.上升；起上升；起床；升起床；升起温室效应温室效应1a Read and understand.Look at the following pictures and predict the main idea of the passage.fewer treesfactory pollutiontraffic pollutionthe ozone holemore carbon dioxide The earth is 4.6 billio

12、n 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 have done are very good for the earth while others are bad._ All over the world,people have cut down millions of trees.When it rains or when the win

13、d blows,the earth is taken away.Forests have become deserts,so many kinds of animals and plants are disappearing.Fewer Trees _ 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 rive

14、rs and lakes are now dead._ Around the earth,theres 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 direc

15、tly.This is very dangerous because this kind of radiation can cause cancer.Traffic PollutionFactory Pollution The Ozone Layer_ 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 cant escape

16、 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 Dioxide1b Read 1a and complete the following tasks.1.Choose suitable titles

17、 for Paragraphs 2-6.Then write it down in front of each paragraph.A.Traffic pollution B.Factory pollution C.Fewer trees D.The ozone hole E.More carbon dioxide2.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 eart

18、h B.the ozone layer in the sky C.the forests around the world D.pollution all over the world342564.The word it in Paragraph 5 refers to _.A.CO2 B.O3 C.O2 D.H2O5.What is the best title for this passage?A.Environment Problems B.Pollution on the Earth C.Hope for the Future D.The Greenhouse Effect 1c Co

19、mplete the notes according to 1a.ProblemEffect on the environmentfewer trees forests become deserts,animals and plants disappeartraffic pollution greenhouse effect,level of oceans rising,climate changecars and buses pollute air,health problemspollute land and water,rivers and lakes deadharmful radia

20、tion reaches the earth,cause cancer factory pollution ozone hole more CO2Group workSurf the Internet to collect more information about environmental problems and effects.Then discuss the information in groups and take notes.WritingCombine the key points in 1c and 2 to form a short passage and pay at

21、tention to the proper linking words.You can write it like this: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 cant swim in the water.Wa

22、ter 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.通过以上活动，我们可以知道：地球正在受多方面的伤害，导致污染问题越来越严重。短文提到了多种问题，分别为：fewer trees;traffic pollution;_;the ozone hole;_.以上所有问题都很严重，我们必须从现在开始做一些事情来保护地球。当堂当堂

23、检测见检测见DCFDCF课课件件活动小结活动小结factory pollutionmore carbon dioxide 根据句意补充完整。根据句意补充完整。1.砍下大树不是件容易的事。_ _ big trees is not an easy thing.2.那只小鹿正穿过树林。The deer is the forest.3.我还未形成对此事的任何看法。I _ _ any opinion towards this yet.4.这里的它指的是那只小狗。The letter“it”here _ _ the dog.5.你听说过“温室效应”吗？Have you ever heard the word _ _?当堂检测当堂检测Cutting downgoing throughhavent formedrefers togreenhouse effectSummaryUnit 2Topic 2 Section C重点单词短语：while;cause;be good for；take away;as a result;be dead;pass through;the level of the oceans各种污染对地球造成的危害和造成这些污染的原因