选修八 4.4Unit 4　Language Study 课.ppt

新课标人教版课件系列,高中英语选修(模块）8-4.4,Language Study,A sample poster,Discovering useful words and expressions(P28),Go over the new words and phrases in the previous sections.Then complete each sentence with one of those new words or phrases.,1,1.Charles Keeling collected _on the carbon dioxide content in the atmosphere over a forty-year period.He found that the amount of carbon dioxide _ increasing during that time.,data,kept on,2.Although we are burning coal in huge _ every year,we wont _ of it for centuries.3.If the amount of greenhouse gases continues to _ we could be facing a global _.,quantities,run out,build up,catastrophe,4.Many scientists believe that global warming has _ through the burning of fossil fuels.They do not think that ignoring the issue is worth the _.,come about,risk,5._ describes weather conditions over a period of years in a particular place.,Climate,6.The _ of a rising sea level would be widespread flooding.7.The use of energy in Susannas country is low _ the use of energy in the USA.,consequence,compared to,8.The warming of the earth is a _ that causes great concern.9.The _ shows temperature changes during the 20th century.10.One hectare of forest can absorb 23 tons of carbon dioxide _ year.,phenomenon,graph,per,Look at the two graphs on page 26.Then complete the paragraphs about them with appropriate words.The first graph shows the global _ between _ and _.,2,temperature,1860,2000,The temperature _ and decreased over this period but on the whole it _ by around one degree Fahrenheit.During this time,the earth reached its _ temperature in about _ and its highest in 2000.,increased,rose,lowest,1910,There was a steady _ in the temperature during the twenty years after 1980.We can see from the graph that the earth has become _ since early last century.The second graph shows the amount of_ in the,increase,warmer,carbon dioxide,atmosphere from _ to _.The carbon dioxide _ steadily over this forty-year period.It went up from 315 to 370 parts _ million.,1957,1997,per,went up,Complete the sentences below with the correct word.Use a new word made from a word on the left and a suffix on the right.,Using Words and Expressions(P63),1,1.Those factories are causing a lot of _ with all their noise and smoke.2.Yesterday the Prime Minister made a _ announcing new laws to reduce water pollution.,pollution,statement,3.The two countries have reached an _ on the levels of greenhouse gases they will allow.4.The quality of the air would improve if there was a _ in the use of coal.,agreement,reduction,5.The increase in the use of fossil fuels could have _ results for the earth.6.We have lost thousands of trees because of a fire started by an _ storm.,catastrophic,electrical,7.This species of frog is the only one in _ in this area.The rest have disappeared.8.The two countries are _ in their use of natural gas.,existence,comparable,9.Past accidents have shown that building nuclear power stations can be _.10.Many people dont understand the _ of the worlds environmental problems.,risky,seriousness,11.I wonder whether these floods have been caused by _ changes.12.It is extremely _ that the world will stop using fossil fuels this century.,climatic,doubtful,Answer key for Exercise 2 P64:1.It would make a big difference to our environment if we planted more trees around the school.,2,2.The research resulted in a better understanding of changes in the climate.3.I think our conference was very successful on the whole.,4.There is a wide range of energy sources:coal,oil,natural gas,water power,nuclear power and so on.5.I think people turn up the heat in their houses too high and just waste energy.,6.Even if there is a steady decrease in the use of oil fuels,the earth will still keep warming up.7.The headmaster has stated that he is not going to put up with littering in the school.,8.Since your bicycle is broken you can use mine,so long as you take care of it.9.The consumption of the energy resources in the USA is almost 6 times as much as the average consumption of the whole world.,10.Ive glanced at your plan so now I want you to finish your final report.,Answer key for Exercise 1:1.It was a scientist called Charles Keeling who made accurate measurements of the amount of carbon dioxide in the atmosphere from 1957 to 1997.,Discovering useful structures(P29),2.(They also believe)it is the burning of more and more fossil fuels that is resulting in this increase in carbon dioxide.,Explanation由it引导的强调句结构：It is(was)+被强调部分+that(who)+句子其他部分注意：此结构强调的成分仅限于主语，宾语和状语。,如：原句：My father did the experiment in the lab yesterday evening 强调主语：It was my father who/that did the experiment in the lab yesterday evening,强调宾语：It was the experiment that my father did in the lab yesterday evening强调时间：It was yesterday evening that my father did the experiment in the lab,强调地点：It was in the lab that my father did the experiment yesterday evening e.g.It was in that city that we met for the first time It was not until he told me that I knew the truth,典型例题分析：1)It was last night _ I saw the film Star Wars Awho Bwhen Cthat Dwhich,答案C 强调句的结构是：It+be+强调部分+that(who)+主谓句。强调句的连词只有两个，that和who。当强调的部分是人，且为句子的主语时，才用who，其余用that。,2)It is ten years _ Miss Green returned to Canada Athat Bwhen Csince Das 答案 C考点是连词用法。本题易误选为A 其实本句不是强调句。,若是去掉It bethat还应是一个完整的句子。而本句去掉It isthat,只剩下ten years Miss Green returned to Canada 不成句。因此本句不是强调句。It is+时间+since.，其中 is=has been.,1.It was this village _ I was bought.A.where B.that C.on which D.which,练习:,2.It was in this village _ I was bought up.A.where B.that C.on which D.which,3.-Was it under the tree _ you were away talking to a friend?-Sure.But when I got back there,the bike was gone.A.that B.where C.which D.while,Answer key for Exercise 2:1.It is greenhouse gases that have warmed the earth by trapping heat energy in the atmosphere.2.It is the greenhouse effect that gives the earths surface the average temperature of 15 C.,3.It is fossil fuels that much of the energy used to light and heat our homes comes from.4.It is the United Sates of America that is the biggest producer of greenhouse gases.,5.It is for centuries that carbon dioxide stays in the atmosphere while other greenhouse gases stay in the atmosphere only for a day or less.6.It is their very existence that low-lying countries feel is in danger from rising sea levels.,7.It is human activities that many scientists believe have caused the earths temperature to rise.8.It is future climate changes and their effects on our environment that scientists want to find out about.,9.It is by several metres that the level of the sea could rise in the years ahead because of global warming.10.It is outer space that might provide us with new energy sources in the future.,Give a full answer to each question about Millennium Kids using the form it is/was.that.,USING STRUCTURES(P64),When was the first childrens conference on the environment organized in Australia?It was in 1996 that the first childrens conference on the environment was organized in Australia.,2.Who runs Millennium Kids?It is children that/who run Millennium Kids.,3.Where can you find out more about Millennium Kids?It is on the Internet that you can find out more about Millennium Kids.,4.Where do the young people decide which projects they want to concentrate on?It is at the yearly conference that the young people decide which projects they want to concentrate on.,5.What is Millennium Kids asking you to reduce,reuse and recycle at the moment?It is plastic bags that Millennium Kids is asking you to reduce,reuse and recycle at the moment.,Answer key for Exercise 2:Indeed,it was four Australian children who started it in 1996 when they organized the first childrens environmental conference.,2.It is at this conference that we decide which projects we want to work on in the following year.3.It was through one of these projects about five years ago that I first became involved in Millennium Kids.,Homework Make four sentences with it for emphasis.,