优化课堂2012高二英语精品课件：UNIT 4 PERIOD Ⅰ WARMING UP .ppt

1、Unit 4Global warmingSection Warming Up&Reading一、课文大意填空From the passage we know that the(1)_ of the earthis on(2)_ At the same time,this passage also shows uspeoples (3)_ ideas about (4)_ warming,andanalyses the reasons for global warming and the possible impactbased on(5)_ and data.temperature rise

2、different global graphs 二、根据课文内容，选择最佳答案1 Who found out the amount of carbon dioxide in theatmosphere from 1957 to 1977?_ADr Janice Foster.CGeorge Hambley.BCharles Keeling.DSophie Armstrong.2Dr Janice Foster believes that global warming is caused by_.Aburning fossil fuelsCwater vaporBgreen houseDnatu

3、ral gasB A 3The author probably agrees that _.Aactually global warming is good for manBwe should do nothing about the global warmingCcatastrophes will happen if the globe keeps on warmingD a lot remains to be found out about the effects of globalwarmingD 4Which is NOT the effect of global warming?_A

4、The sea level will rise.B Severe storms,droughts,famines,the spread of di-seases,and destruction of species will happen.CCrops will produce less.DPlants will grow faster.5What is the main idea of the passage?_AGlobal warming.CEconomic crisis.BAir pollution.DTsunamis.C A Dr Janice FosterGeorge Hamble

5、yCarbon dioxide has caused theglobal temperature to(1)_An increase of fivedegrees would be a(2)_and could be very(3)_More carbon dioxide is a(4)_ thing,which makescrops produce(5)_ andwill encourage a(6)_range of animals.三、阅读课文，然后完成下列表格The different ideas between Dr Janice Foster&GeorgeHambleygo up

6、catastrophe serious positive more greater So how has this come about and does it matter？这种温度的增长是怎么产生的呢？会产生什么影响呢？1come about 发生；造成典例 Do you know how the accident came about?你知道车祸是怎么发生的吗？拓展 come along 一起来；进展come across(偶然)遇见come up 发生；举行come up with 提出come out 出现；出版；(消息)传开；(观点)公开运用 用 come 及其构成短语的适当形式填

7、空Im going to see a movie today.Do you want to _？An earthquake _ in that country twomonths ago.Her wedding is _ soon.It was getting dark and the moon was _.I _ a friend in KFC e along came about coming up coming out came across There is no doubt that the earth is becoming warmer(see Graph 1)and that

8、it is human activity that has caused thisglobal warming rather than a random but natural phenomenon.毫无疑问，地球正在变暖(见表 1)，但全球变暖是人为的，而不是随意的自然现象。2There is no doubt that.解析There is no doubt that.表示“毫无疑问”，that引导的从句为名词 doubt 的同位语从句，进一步解释“怀疑”的具体内容。如：There is no doubt that shortsightedness is a serious problem

9、among the youth of our country.毫无疑问，近视在我国年轻人中是一个严重的问题。运用 完成句子_(毫无疑问)youll be warmly welcomed.There is no doubt thatAll scientists subscribe to the view that the increase inthe earths temperature is due to the burning of fossil fuels likecoal,natural gas and oil to produce energy.所有的科学家都赞成这个观点，人们为了生产

10、能量而燃烧化石燃料(如煤、天然气和石油等)，从而引起了地球温度的升高。3subscribe vi.同意；捐赠；订阅 vt.签署(文件)；捐助典例 He didnt subscribe to my proposal.他不赞同我的建议。He subscribed his name to the form.他在表上签了名。拓展 subscribe to 同意；赞成；订购，订阅运用 完成句子I have never _ (同 意)the view thatschooldays are the happiest days of your life.The lawyer invited his clien

11、t to _(签署)the affidavit(宣誓书)subscribed to subscribeThe problem begins when we add huge quantities ofextra carbon dioxide into the atmosphere.当我们在大气层中增加了大量额外的二氧化碳时，问题就来了。4quantities of 大量的解析 quantities of 表示“大量的”，既可用来修饰可数名词复数，也可用来修饰不可数名词，其谓语动词要用复数。如：Quantities of paper products are produced in this f

12、actory.这家工厂生产大量的纸制品。Trees can give off quantities of water every day.树木每天可以释放出大量的水分。拓展(1)a quantity of 大量的(后接谓语动词用单数)in quantity 在数量上；大量地in large quantities 大量地(2)表示“大量的”的常用短语有：只可修饰可数名词：many,many a(谓语动词用单数),a great/good many,agreat/large number of/numbers of只可修饰不可数名词：much,a great/large amount of/amo

13、unts of,a good/great dealof既可修饰可数名词，又可修饰不可数名词：a lot of/lots of,a quantity of/quantities of,plenty of运用 用所给单词的适当形式填空Quantities of food _(be)put on the table.A large quantity of apples _(be)sold out.are/were is/was It means that more heat energy tends to be trapped inthe atmosphere causing the global

14、temperature to go up.它意味着更多的热能将被困在大气层中，从而引起全球气温上升。5tend解析(1)vi.趋向；易于；照顾Old people tend to get fat.老年人容易发胖。(2)vt.照顾；护理She is good at tending little children.她擅长照看小孩。拓展 tend to do sth.倾向做某事tend to/towards sth.倾向于某事tend(to)sb./sth.照顾某人/某物运用 完成句子We hire a girl to _(照顾孩子们)for afew hours each day.The drug

15、 is effective but _(易于)causeheadaches.tend(to)the children tends to 6go up 上升；增长；升起典例 Prices of fruit and vegetables have gone up.水果和蔬菜的价格已经上涨了。拓展 go by 经过；消失go down 下降；下沉go over 复习；仔细检查go through 经历；遭受go on 发生；继续运用 用上面所提供的短语的适当形式填空We hope the water level in Changjiang River will stop_.Youre suppose

16、d to _ the goods beforeyou sign.going up go over They also agree that it is the burning of more and morefossil fuels that has resulted in this increase in carbon dio-xide.他们还赞同下述观点：正是由于越来越多的燃烧化石燃料导致了二氧化碳的增加。7result in 导致典例 Our actions can result in disaster.我们的行为会引起灾难。辨析 result in/result from(1)resu

17、lt in 意为“导致；结果是”，指引起某种结果，即主语是因，宾语是果。如：Any of these may result in serious injury or death.这些中的任何一个都会导致严重的伤害或死亡。(2)result from 意为“起因于”，指某种结果起因于某事，即主语是果，宾语是因。如：Two conclusions result from this fact.从这一事实中可以得出两个结论。运用 用上面所提供的辨析短语的适当形式填空The flood _ a considerable decrease inproduction.His failure_ not wor

18、king hard enough.resulted in resulted from On the other hand,there are those,like GeorgeHambley,who are opposed to this view and believe that weshould not worry about high levels of carbon dioxide in the air.在另一方面，还有一些人，像乔治汉布利，他们反对上面的观点，认为我们不必担心空气中会有高含量的二氧化碳。8oppose vt.反对；反抗；与(某人)较量典例 His motion was

19、 opposed by most directors.他的提议遭到了大多数董事的反对。拓展 oppose oneself against/to.(使)某人反对be opposed to 反对运用 完成句子His parents were _(反对)their sons rushdecision.The young man _(使他自己反对)the new policy on behalf of his group.opposed to opposed himself to/againstThey predict that any warming will be mild with fewbad

20、 environmental consequences.他们预言说，变暖的情况不会很严重，对环境的影响也不会太坏。9consequence n结果；后果；影响典例 Such a mistake may lead to disastrous consequences.这样一种错误可能会导致灾难性的后果。拓展 as a/in consequence 因而；结果in consequence of 由于的缘故take the consequences(of)承担(某事的)后果of little consequence 意义不大，无足轻重运用 完成句子_(结果),the man failed in th

21、e game.The cake went bad _(由于)the hotweather.The confident girl thinks that beauty _(意义不大)to her.As a/In consequence in consequence ofis of little consequence“.it will encourage a greater range of animalsall ofwhich will make life for human beings better.”“它还会促进动物的生长所有这些都能改善人类的生活。”10range解析(1)n.种类；范

22、围There is a full range of activities for children.这里给孩子们提供各种活动。She has a wide rang of interest.她有广泛的兴趣爱好。(2)v.排列；归类于；变化；延伸The cards were ranged in alphabetical order.卡片以字母顺序排列。The prices of leather shoes range from 100 to 250 dollars.皮鞋的价格从 100 美元到 250 美元不等。拓展 in/within the range of 在的范围内in range wi

23、th 和并列a range of 一系列的；一排range from.to.在到范围内运用 完成句子 The watches _(在 这 个 范 围 内)arepriced at 24.50 dollars.The show had a massive audience,_(范围从孩子到)grandparents.I offered her _(一系列的)opinions.within/in this range ranging from children to a range of Greenhouse gases continue to build up in theatmosphere.

24、温室气体继续在大气层中聚集。11build up 聚集；集结；增强；建立典例 The clouds are building up.乌云正在聚集起来。The weightlifting built up his body.举重增强了他的体质。She built up my confidence.她帮我树立了信心。拓展 build on 加/扩建；建立在(基础)上运用 完成句子Many a big business has been _(聚 集)from small ones.Thecompanydonated1milliondollarsto_(增强)its honour.You can _(

25、建 立 在 基 础 上)whatother people did,and provide things for other people to_(在基础上构建)built up build up build on build on Even if we start reducing the amount of carbon dioxideand other greenhouse gases,the climate is going to keep onwarming for decades or centuries.即使我们开始减少二氧化碳和其他温室气体的含量，在(未来)几十年或几个世纪内，气

26、候仍会持续转暖。12even if解析 even if 意为“即使”，相当于 even though，用于引导让步状语从句。若从句所假设的事情难以实现，则从句的谓语动词要用虚拟语气。如：Well go even if it rains.即使下雨我们也要去。Even if you saw him pick up the money,you cant be sure hestole it.就算你看见是他拾起的钱，你也不能肯定钱就是他偷的。运用 完成句子_(即 使)it will take me six weeks,I amdetermined to finish the task.Even if/

27、though13keep on解析 keep on sth./doing sth.意为“继续做某事”。如：They kept on working after dark.天黑后他们还继续工作。If we keep on our way for another hour,we should reach thevillage.如果再继续向前走一小时，我们就到那个村子了。拓展 keep off 躲开，避开keep to 坚持，信守keep up 保持良好状态；保持；继续；不落后，赶得上keep ones feet 站稳，不跌倒辨析 keep on doing/keep doing(1)keep on doing 强调“继续干某事”，其动作是时断时续的，常与表示短暂动作的动词连用。如：She kept on asking me what the time was.她一直在问我几点了。(2)keep doing 强调“不间断地或持续地做”，常与表示延续动作的动词与静止状态的动词连用。如：The machine kept running.机器一直在运转。运用 用上面所提供的辨析短语的适当形式填空Though it was raining,they _ reaping(收割)the rice.I _ standing in the train all the way.kept on kept