高二英语教案：高二英语选修6 unit 4教案4.pdf

教案教案 4 4人教选修人教选修 6 6 Unit4Unit4 GlobalGlobal WarmingWarmingGrammarGrammarTeaching materialTeaching materialNSEFC Book 6 Unit 4Teaching aimsTeaching aimsEnable the students to master the usage ofthe form it is/was.that.Teaching important pointsTeaching important pointsHow to enable the students to know the structure and the usage of the form itis/was.that.Teaching difficult pointsTeaching difficult pointsHow to help the students to master the usage of the form it is/was.that.Teaching aidsTeaching aidstape recorder,slidesTeaching proceduresTeaching proceduresStep1 RevisionStep1 RevisionT:First lets check answers.(slide show)Discovering useful words and expressions.(P28)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.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 _.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_.5._ describes weather conditions over a period of years in a particularplace.6.The _ of a rising sea level would be widespread flooding.7.The use of energy in Susannas country is low _ the use ofenergy in the USA.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.Keys：1.datakept on 2.quantities;run out 3.build up;e about;risk 5.Climate 6.consequence pared to 8.phenomenon9.graph 10.perAnswer keys for Ex.2 on Page 28:The first graph shows the global _ between _ and _The temperature _ and decreased over this period but on the whole it _ by around _ and its highest in 2000.Therewas a steady _ in the temperature during the twenty yearsafter 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 atmosphere from _ to _.The carbon dioxide _ steadily over this forty-year period.It went up from 315 to 370 parts _million.Keys：Temperature；1860；2000；increased；rose；1910；increase/rise；warmercarbon dioxide；1957；1997；increase/went up；perStep2 Grammar强调句结构常考的强调句结构是it 引导的句子。It is(was)被强调部分+that(who)+句子其他部分。此结构强调的成分仅限于主语，宾语和状语。It is from the sun that we get light and heat.It was not until I had read your letter that I understood the true state of affairs.Karl bought Marva a bicycle on her birthday卡尔在玛瓦生日那天给她买了一辆自行车。It was Karl thatwho bought Marva a bicycle on her birthday（强调主语）It was Marva for whom Karl bought a bicycle on her birthday（强调间接宾语）It was a bicycle that Karl bought Marva on her birthday（强调直接宾语）注意区别强调句中的thatwho分句与定语从句：It was the student thatwho asked the silly question是一个学生问了这么一个愚蠢的问题。（分裂句）He was the student who asked the silly question他就是问了这么一个愚蠢问题的学生。（划线部分是定语从句）二、二、not.until.的强调形式:It is not until+被强调部分+that.“直到才”，主要用于强调时间状语的强调句型。We did not begin studying French until we entered university我们进了大学才开始学法语。要强调until we entered university，就成了：It was not until we entered university that we began studying French_ the 18th century that man realized that the whole of the brain was involved in the workings of the mindA.During B.In C.It was until D.It was not until D对。直到十八世纪，人们才意识到：心理活动与整个大脑有关。三、强调句的疑问句句型1.强调句的一般疑问句句型:Is/Was+it+所强调的部分+that/who/whom+其它?2.强调句的特殊疑问句句型:特殊疑问词+is/was it that/who/whom+其它?Why is it that you hate winter？你究竟为什么不喜欢冬天？How was it that you missed such a wonderful lecture？你怎么会错过这么精彩的报告？When was it that they went abroad？他们什么时候出国的？四、判断强调句的方法判断是否是强调句是，可把 It is/was that 去掉，剩余部分在不增减任何词的情况下还是一个完整的句子，那么这种句子是强调句。It was in the street that I met her father.In the street I met her father.It was because she was ill that they didnt ask her to do the job.Because she was ill,they didnt ask her to do the job.StepStep 3 Exercises 3 Exercises一、根据划线部分把下列句子变成强调句。1.Peter lent us the money.2.They want money.3.All this happened on Monday.4.I didnt hear form heruntil last summer.5.Why does everyone think I am narrow-minded？KeysKeys：1.It was Peter who lent us the money.2.It is money that they want.3.It was on Monday that all this happened.4.It was not until last summer that I heard from her.5.Why is it that everyone thinks I am narrow-minded？二、Multiple choices1.It was in this village _ I was brought up.A.whereB.that C.on whichD.which2.Is it the factory_ this type of cars are produced?A.whichB.whereC.thatD./3.It was _ the old worker came that we _ the experiment.A.until;didnt beginB.not until;beganC.until beganD.not until;didnt begin4.It was in the lab _was taken charge of by Mr.Harris _they did theexperiment.A.which，thatB.that，whichC.that，whomD.which，where5.It was _he did _frightened me.A.what，that B.that，thatC.what，what D.that，what6._ on Monday night that all this happened?A.Is itB.?It isC.Was itD.It wasKeys：BBBAACStep4 Homework1.Finish exercises of discovering useful structures(P29)and using structures on P64.2.Preview Using Language.