选修六Unit4reading.ppt

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1、Unit 4 Global WarmingEnergy sources?International relations?Money?Technology?Which is the most important to a country?Man power?windmillsa coal power station an oil refinery(精炼厂)a nuclear power plantsolar panelshydro-electric dam（水利大坝）What are fossil fuels?Ancient animal and plant material below the

2、 surface of the earth with a high carbon content,such as coal,oil and natural gas,which can be burnt to produce energy.Also known as non-renewable energy because once they are used,they have gone forever;they cannot be renewed.Which energy sources are renewable and which are non-renewable?non-renewa

3、blerenewablegreenhouseHow does it work?The air inside is warm because the glass traps the heat from the sun and keeps it from escaping.This makes the greenhouse heat up and so the plants can grow throughout the cold period.Reading:The Earth is Becoming Warmer-But Does It Matter?Pre-readingThis artic

4、le is from _.a.a magazineb.the internet c.a book A title,a first paragraph that is in bold(黑体),the main text in two columns（栏）;two graphs;two quotes.（引述）Sophie Armstrong,Earth Care.Global warming.1.Who wrote the magazine article?What is the name of the magazine?2.What is the main topic of the articl

5、e?Glance and Answer!Dr Janice Foster;Charles Keeling;George Hambley.3.What are the names of the three scientists mentioned in the article?Glance and Answer!Fast readingWhats the main idea of the passage?The _ have different ideas on whether it _ when the earth is becoming _.scientistsmatterswarmerDi

6、vide the passage into 4 parts.Part 1(Para 1):There is a fierce debate over what has caused this global warming.Part 2(Para 2-5)Some scientists think that global warming could be serious.Part 3(Para 6)Some think that we should not worry much about global warming.Part 4(Para 7):No one knows what is th

7、e effects of global warming will be.1.How has global warming come about?Careful Reading1.Human activity2.A natural phenomenon Dr Janice FosterWhat is“greenhouse effect”?Small amounts of gases in the atmosphere,like carbon dioxide,methane and water vapour,trap heat from the sun and therefore warm the

8、 earth.greenhouse effectWhat is the first graph about?What is the purpose of it?It shows the temperature increase of one degree Fahrenheit between 1860 to 2000.Its purpose is to illustrate(解释，说明）points by providing evidence.What is the second graph about?The second graph shows the carbon dioxide con

9、tent in the atmosphere from 1957 to1997.2.Does it matter?Careful ReadingPositive effects Negative effects 1.cause the sea level to rise2.severe storms3.floods4.droughts5.famines6.the spread of diseases7.disappearance of speciesPositive effects Negative effects 1.cause the sea level to rise2.severe s

10、torms3.floods 4.droughts5.famines6.the spread of diseases7.disappearance of speciesPositive effects Negative effects 1.make plants grow faster2.crops will produce more3.a greater range of animals4.make life better George HambleyWhy are there two quotes(引言)?Because they are important or interesting p

11、oints.Meanwhile,they can make the text persuasive,credible(可信的),and authoritative(权威的).Their aim is to attract your attention and to make you read.Language features of a scientific magazinelPrecise.(315 parts to 370 parts per million.)lscientific and thoughtful.(not a diary or a fiction)lUnderstanda

12、ble.(not many difficult terms)lArtistic.(graphs vivid,not boring)The author probably agrees that _.A.Actually global warming is good for man.B.We should do nothing about the global warming.C.Catastrophes will happen if the globe keeps on warming.D.A lot remains to be found out about the effects of global warming.Further understanding What can we do to control the What can we do to control the global warming?(slogans)global warming?(slogans)DiscussionLet us unite!Drive less,walk more!Speak less,do more!