高二英语教案：高二英语选修6 unit 4教案4.pdf

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1、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 kn

2、ow 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 l

3、ets 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 yea

4、r,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 peri

5、od 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 hectar

6、e 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 th

7、is 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 d

8、ioxide _ 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

9、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 birt

10、hday（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”，

11、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.D

12、uring 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

13、 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 jo

14、b.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

15、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.that

16、D./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.