选修六unit4-Reading教学讲解课件.ppt

1、Unit 4 Global warmingReading高二人教新课标版选修六高二人教新课标版选修六Pre-reading1.Have you ever seen a greenhouse?is made of glass used for growing plants,especially during cold weather.2.How does the greenhouse work?The air inside was warm because the glass traps(挡住挡住,吸收吸收)the heat from the sun and keeps it from esca

2、ping(逃跑逃跑).This makes the greenhouse heat up(热量热量上升上升)and so the plants can grow throughout(在在期间期间)the cold period.3.What are Greenhouse Gases?Methane4Ozone51Carbon dioxide2Water vapor1 1Nitrous oxide34.Greenhouse EffectGlobal warmingGreenhouse gases trapped the heat from the sun,which causes the te

3、mperature of earth goes up.Greenhouse effectGreen house effectTHE EARTH IS BECOMING WARMER BUT DOES IT MATTER?Reading 1)How many paragraphs does the reading 2)Make a division of the text.Read the passage quickly(3)text consist of?Please number them.Fast-ReadingMain ideas of each part:Introduce a deb

4、ate over the issue of global warming.raising a questionHow global warming comes about.giving examples,using graphs,explanation List two different attitudes among scientists towards global warming.Its up to readers to think and decide whether people should do something about global warming or not.giv

5、ing examples,making contrastleaving a questionAre the risks too great?So can you predict the future of the global warming?Who writes this article?Sophie Armstrong of Earth CareWhat rose about one degree Fahrenheit?The temperature of the earthCareful readingIntroduction of global warming.2._1._(2-5)H

6、ow global warming comes about?the burning of fossil fuels human activityCarbon dioxideMethaneWhat are the Greenhouse gases?1.2.3.Water vaporWhat are the effects of global warming?v a rise in the sea level v Severe storms,droughts,famines,the spread of diseases,and the disappearance of speciesv Make

7、plants grow fastereffectsThe different ideas between Dr.Janice Foster&George Hambleygo upcatastrophevery seriouspositiveproducea greater range of animals4.What are the two graphs about?The first graph shows the temperature increase of one degree Fahrenheit between 1860 to 2000.The second graph shows

8、 the carbon dioxide content in the atmosphere from 1957 to 1997.from around 315 parts per million to around 370 parts per millionHuge quantities of extra carbon dioxideFrom 1957 to 19975.What is the main topic of the article?Global warming/the warming of the earth.1.Who found out the amount of carbo

9、n dioxide in the atmosphere from 1957 to 1977?A.Dr.Janice Foster.B.Charles Keeling.C.George Hambley.D.Sophie Armstrong.BChoose the best answer.2.Which of the following is Dr Janice Fosters opinion?A.The result of the temperature increase will be serious.B.The amount of warming is nothing serious.C.W

10、e neednt worry about high levels of carbon dioxide.D.Global warming is a natural phenomenon.A3.Which of the following is TRUE according to the text?A.The temperature of the earth increased about one degree Fahrenheit during the 20th century.B.The carbon dioxide content in the air increased by 70 par

11、ts per million from 1957 to 1997.C.All scientists accept the data in graph 2 except Charles Keeling.D.Janice Foster says that more carbon dioxide will make plants grow faster.A4.The author probably agrees that _A.actually global warming is good for man.B.we should do nothing about the global warming

12、.C.catastrophes will happen if the globe keeps on warming.D.a lot remains to be found out about the effects of global warming.DTrue or false?1.The temperature in the last century did not seem to increase much.2.Everyone believes that global warming is caused by the activities of humans.3.Janice Fost

13、er believes that she can measure the future global rise in temperature.TTF4.The rise in carbon dioxide is causing a steady increase in global warming.5.George Hambley believes that global warming will do good rather than harm to the earth.6.It is clear what the effects of global warming will be.TTFHomework1.Read the passage again and review the new words and expressions.2.Write a passage about global warming.