外研版高中英语必修三课件：Module 4 Period One

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1、Module 4 Sandstorms in Asia,Most of the sandstorms that had swept China last year originated from foreign land，a Chinese official in charge of desertification control said Monday.And the invasions(入侵) could partly explain the frequent sandstorms in the country in recent years despite its achievement

2、s in desertification control. Since the start of last spring，the north and northwestern Chinese regions had been hit by 17 sandstorms，of which，a dozen came from foreign land.,话题导入,Situated in the central-Asia sandstorm region，one of the worlds four largest sandstorm sources，China also suffers from s

3、andstorms from outside the country while being blamed as a sand source to northeast Asia.The other three major sources are in Africa，North America and Australia. The land suffering from desertification has been decreasing by 7,585 sq.km annually in China，and the area of sandy land has also been fall

4、ing by 1,284 sq.km a year.,The shrinkage(收缩) forms a clear contrast to the fact that the land suffering from desertification and sandy feature was added by 10,400 sq.km and 3,436 sq.km late last century，respectively. Currently，the desertification land in China makes up 2.64 million sq.km，accounting

5、for 27.46 percent of the nations land，and its sandy land totals 1.74 million sq.km，accounting for 18.1 percent of the countrys total.,根据上文完成下列各题 1.Where do most of the sandstorms in China come from? _ 2.What does the underlined word “decreasing” mean in Paragraph 4?_ 3.Which is believed to be the sa

6、nd source to northeast Asia? _,Foreign countries.,It means “going down” .,China.,基础自测,课文预读,内容索引,要点探究,当堂达标,Period One Introduction & Reading and Vocabulary,基础自测,.重点单词 1. adj.吓人的；可怕的vt.使惊吓 2. adj.内陆的；内地的n.陆地 3. n.进程；过程 4. n.公民，市民 5. n.沙尘；灰尘 6. n.力量；力气adj.强健的，强壮的,frightening,frighten,inland,land,proces

7、s,citizen,dust,strength,strong,.重点短语 1. 砍倒 2. 挖 3. 突然遭遇(风暴等) 4. 由于，因为，作为的结果 5. 一个接一个地,cut down,dig up,be caught in,as a result of,one after another,.重点句式,They are often thick you cannot see the sun，and the wind is sometimes strong enough to move sand dunes. 沙尘暴常常很大，以至于遮住了太阳，有时风力大得足以移动沙丘。,1.so.that.,

8、so,that,“ was a terrible experience，” he said. 他说：“遇上沙尘暴是一种可怕的经历。”,2.不定式作主语,To have been caught in a sandstorm,The storms sometimes continue all day and traffic moves very slowly because the thick dust makes it difficult (see). 暴风有时持续一整天，车辆开得很慢，因为浓浓的尘埃降低了能见度。,3.makeitadj.to do,to see,课文预读,.阅读课文，匹配段落

9、大意 1.Para.1 A.The description of strong sandstorms. 2.Para.2 B.The effects of sandstorms on Beijing. 3.Para.3 C.The measures to prevent sandstorms coming to Beijing. 4.Para.4 D.Sandstorms，Asian major disaster. 5.Para.5 E.What to do in a sandstorm. 6.Para.6 F.Northwest China，a sandstorm center.,.课文判断

10、正(T)误(F) 1.Sandstorms are strong，wet winds that carry sand.( ) 2.Sandstorms come from the desert areas.( ) 3.The land becomes desert mainly because of climate changes.( ) 4.Sandstorms in China seem to have increased in recent years.( ) 5.Sandstorms usually continue several months in Beijing.( ),F,T,

11、F,T,F,.课文阅读理解 1.What is the best description about a sandstorm according to the text? A.It has been a major disaster for many Asian countries for centuries. B.It is strong wind carrying sand. C.It is a way to cause land to become desert. D.It is a kind of natural disaster that cant be treated.,答案,1,

12、2,3,4,5,2.What is the main reason for the increase of sandstorms in China recently? A.To be close to many deserts. B.The worsening of the weather in China. C.Desertification. D.Cutting down trees and digging up grass.,1,2,3,4,5,答案,3.What effects are sandstorms bringing to people living in cities? A.

13、The whole city is usually covered in a thick and brown-yellow dust. B.Traffic moves very slowly. C.People cant breathe well and the dust makes them ill. D.All of the above.,1,2,3,4,5,答案,4.What is the best way to avoid the effects from the sandstorm? A.To live far away from deserts. B.To stay at home

14、 when a sandstorm happens. C.To wear a mask if you want to go out. D.To plant more trees.,1,2,3,4,5,答案,5.Which of the following is NOT the element to make Central Asia，North America，Central Africa and Australia the four main places where there are sandstorms? A.The climate in these places is rather

15、bad. B.They are all the places with big deserts. C.The natural environment in these places is worsening every year. D.The governments in these places pay little attention to the protection ofnature.,1,2,3,4,5,答案,要点探究,It lasted for ten hours and was very frightening. 它(这场沙尘暴)持续了十个小时，非常可怕。,重点词汇,(1)fri

16、ghtening adj.令人害怕的，吓人的 (2)frightened adj.害怕的 be frightened of/at/that.害怕 be frightened to do sth.害怕去做某事 (3)frighten vt.使害怕 frighten sb.away吓走某人 frighten sb.to death把某人吓得要死 frighten sb.into doing sth.恐吓某人做某事 frighten sb.out of doing sth.恐吓某人使其不敢做某事,归纳拓展,(1)A sudden stop can be a very frightening expe

17、rience，especially if you are travelling at high speed.(2016浙江) 突然停下来可能是一次非常可怕的经历，尤其是你正在高速行驶时。 (2)The boy was frightened to speak. 那孩子吓得不敢说话。 (3)They frightened the old lady into signing the paper. 他们恐吓那位老太太签了字据。,语境助记,(1)用frighten的正确形式填空 The girl was by the dog. On seeing the mans face，all are away.,

18、frightened,frightened,frightening,frightening,frightened,(2)单句改错 I had a frightened encounter(遭遇) with a poisonous snake.,frightening,题组训练,cut down砍倒；杀死；削减；缩小(尺寸、数量等) cut out剪除；切掉，割掉；停止；放弃 cut up切碎；使伤心 cut off切断；停掉；隔绝 cut in插入；插嘴 cut across/through抄近路穿过,Deserts are also created because people cut do

19、wn trees and dig up grass. 人们砍树挖草也造成了土壤的沙化。,归纳拓展,(1)Dont cut down the tree that gives you shade. 不要忘恩负义。 (2)John was cut up about his failure to win Marys heart. 约翰没有赢得玛丽的芳心，感到十分伤心。 (3)As we were talking，she cut in with a question whether we could cut across the square. 我们正在谈话，她插嘴问我们是否可以抄近路穿过广场。,语境助

20、记,(1)写出下列句子中cut down的汉语意思 These people do not have equipment to cut down the trees. _ The whistling bullets cut the enemy soldiers down like corn. _ My mother cut down fathers trousers to fit me. _ May I suggest that you cut down the quantity of your order by half ? _,题组训练,砍伐，砍倒,杀死,缩小(尺寸),削减,(2)用适当的

21、介、副词填空 The flood cut their supplies. Halve the tomatoes and then cut them _. I was just talking to Mary when Dave cut _. How can you cut _ the risk of cancer? You can cut _the unimportant details.,off,up,in,down,out,Scientists have tried many ways to solve this problem and in China，a mass campaign h

22、as been started to help solve it. 科学家们尝试了许多方法来解决这个问题，在中国，也发动了群众来对付沙尘暴。,归纳拓展,mass adj.大量的；大规模的，广泛的；n.团，块，堆；大量，许多；vt.&vi.集结；聚集 mass production批量生产 the masses群众 masses ofa mass of许多，大量(可用来修饰可数名词，也可用来修饰不可数名词。作主语时，a mass of谓语动词的单复数与其后的名词保持一致；masses of谓语动词的单复数与masses保持一致。),(1)Their latest produce is aimed

23、 at the mass market. 他们的最新农产品瞄准了大众市场。 (2)His heart is linked with the hearts of the masses. 他和群众心连心。 (3)There were masses of clouds in the sky. 天上有大块大块的云团。,语境助记,(1)用mass或其短语的正确形式填空 The movement was a campaign which was organized by government. are the true makers of history.,题组训练,mass,The masses,(2)

24、单句改错 So far，a mass of books has been handed out.,have,思考 许多短语都有“许多的，大量的”之意，可修饰可数或不可数名词。你能列举一些吗？,_ _,可数或不可数名词,_ _ _,可数名词复数,_ _,不可数名词,plenty of,lots ofa lot of,numbers ofa number of,a good/great many,quite a few,a great deal of,quite a little,be caught in(be trapped inbe stuck in)遭遇上 catch构成的常见短语： cat

25、ch up with赶上 catch hold of抓住，握住 catch sight of看见 catch sb.doing sth.发觉/发现某人在做某事,“To have been caught in a sandstorm was a terrible experience，”he said. 他说：“遇上沙尘暴是一种可怕的经历。”,归纳拓展,(1)Thankfully，I was not caught in the terrifying thunderstorm. 谢天谢地，我没有遭遇那场骇人的雷暴。 (2)Youll have to work harder to catch up

26、with the top students. 你必须更加努力地学习，才能赶上优秀的学生。 (3)The teacher caught him sleeping in class. 老师逮住他在课堂上睡觉。,语境助记,(1)用catch短语的正确形式填空 I often a heavy traffic on my way to school. At the moment our technology is more advanced，but other countries are us. The child his mothers hand tightly in the earthquake.

27、She a car in the distance，but I saw nothing.,题组训练,am,caught in,catching up with,caught hold of,caught sight of,(2)单句改错 If a cook is caught smoke in the kitchen，he will be fired immediately.,smoking,(1)strength n.U力量；力气；意志力；坚强；C强项，优势，长处 have the strength to do sth.有做某事的力气/意志力 build up ones strength增强

28、体力 with all ones strength用尽全身的力气 strengths and weaknesses强项和弱项；优缺点 (2)strengthen v.加强，巩固 (3)strong adj.强健的，强壮的,.，but the strength of the storm sometimes surprises people. ，但是沙尘暴的威力有时让人意外。,归纳拓展,(1)He has been doing morning exercise to build up his strength. 他一直进行晨练以增强体力。 (2)Everyone has his or her st

29、rengths and weaknesses. 人人都有优缺点。 (3)At present，America is taking some measures to strengthen the economy. 目前美国正在采取措施以巩固经济。,语境助记,(1)用strength的正确形式填空 Vision and ambition are his great _. The exercises are designed _ your stomach muscle. There is _evidence of a link between exercise and a healthy heart

30、.,题组训练,strengths,to strengthen,strong,(2)完成句子 他用尽全力举起那块石头。 He lifted the stone _. 她没有力气继续走下去了。 She didnt _any further.,with all his strength,have the strength to walk,They are often so thick that you cannot see the sun，and the wind is sometimes strong enough to move sand dunes. 沙尘暴常常很大，以至于遮住了太阳，有时风力

31、大得足以移动沙丘。,经典句式,归纳拓展,(1)本句中的so.that.意为“如此以至于”。so是副词，修饰形容词或副词；that引导结果状语从句。具体有以下几种形式：,soadj./adv.that从句soadj.a/an可数名词单数that从句somany/few/much/little可数名词复数或不可数名词that从句,(2)such.that.中的such常用来修饰名词。主要有以下几种形式：,sucha/anadj.可数名词单数that从句suchadj.不可数名词that从句suchadj.可数名词复数that从句,(3)当little表示“小”而不表示“少”时，必须用such修饰，

32、如：such a little boy/such little boys；而当little表示“少”而不表示“小”时，用so修饰，如：so little water。 (4)so和such放在句首时，主句要用部分倒装。 (5)so that也可连在一起使用，引导结果状语从句或目的状语从句；引导目的状语从句时相当于in order that。,(1)He is so excellent a student that we all want to make him our example. 他是个如此优秀的学生，以至于我们都想以他为榜样。 (2)There were so many people

33、there that I wasnt able to pick her out. 那儿有很多人，以至于我没认出她来。 (3)So careless was David that he didnt pass the final exam. David如此粗心，以至于他没通过期末考试。 (4)We got up early so that/in order that we could catch the first bus. 我们很早就起床了，以便能赶上第一班公共汽车。,语境助记,(1)句型转换 It was so hot a day that nobody wanted to do anythi

34、ng. It was that nobody wanted to do anything. The teacher spoke so fast that I could not follow him.the teacher that I could not follow him.,题组训练,such a hot day,So fast did,speak,(2)单句改错 He has made so great progress that the teacher praised him.,such,The storms sometimes continue all day and traffi

35、c moves very slowly because the thick dust makes it difficult to see. 沙尘暴有时持续一整天，车辆开得很慢，因为浓浓的尘埃降低了能见度。,归纳拓展,makes it difficult to see是makeitadj./n.to do结构，it是形式宾语，代替后面的动词不定式短语。常用于此结构的动词还有feel，think，find，consider等。,(1)The location made it difficult to lead a quiet personal life. 这地方很难让人安静地生活。 (2)Ive

36、found it interesting to talk with foreigners in English. 我发现用英语与外国人交谈非常有趣。 (3)Ive made it a rule never to hurry. 我已养成凡事从容不迫的习惯。,语境助记,(1)单句语法填空 The two girls are so alike that strangers find difficult to tell one from the other. I found it hard (take) in what the teacher said. (2)完成句子 He felt (被邀请来参加

37、这个晚会是件很荣幸的事). They think_(大学生掌握一门外语是很有必要的).,题组训练,it necessary for college students to grasp/master one foreign,language,it,to take,it an honour to be invited to the party,This is a process that happens when land becomes desert because of climate changes and because people cut down trees and dig up g

38、rass.,难句分析,句式分析 本句是一个复合句。主句是 ；that happens. 为 从句修饰process；when land.为 从句；because of climate changes和because people cut down trees and dig up grass分别是 和 从句。,自主翻译_,This is a process,定语,时间状语,原因状语,原因状语,这是一个因气候变化和人类砍树挖草导致土壤沙化的过程。,当堂达标,.单词拼写 1.According to the weather (预报)，a hurricane is likely to hit Gua

39、ngdong Province tonight. 2.That politician won the presidential election (活动) and became the President. 3.The (过程) of finding Bengal tigers is most appealing. 4.Its dangerous to (骑自行车) in the thick fog. 5.Shes Italian by birth but is now an Australian (公民). 6.I dont have any to climb any further.,fo

40、recast,campaign,process,cycle,citizen,strength,7.There was a of people around the club center. 8.It is (吓人的) when a tiger is angry. 9.A cloud of rose as the truck drove off. 10.Because of the sweep of the ，sand was all over the sky of the entire city.,mass,frightening,dust,sandstorm,.选词填空11.The ship

41、 a terrible storm and lost its control. 12.There are many people who want to earn some money by _ trees. 13.The surface of our earth is covered with water. 14.It was time for a break and we came out of the classroom . 15.She died her injuries.,was caught in,cutting down,masses of,one after,another,a

42、s a result of,cut down；masses of；be caught in；one after another；as a result of,.句型转换 16.I got up early this morning to catch the early train. I got up early this morning I could catch the early train. 17.The boy was so clever that he was able to work out the puzzle. The boy was clever work out the p

43、uzzle. 18.She made such a good meal that we all ate far too much. She made so that we all ate far too much.,so that,enough to,good a meal,19.It appeared that she had been kept waiting for a long time. She appeared waiting for a long time. 20.It was difficult for us to arrive at the airport on time b

44、ecause of the heavy rain. The heavy rain for us at the airport on time.,to have been kept,made it difficult,to arrive,.课文语法填空 Sandstorms，strong dry winds 21. carry sand，have struck some Asian countries for centuries.As a result of desertification，sandstorms in China seem to 22. (increase) in recent years. This is a process that happens 23. land becomes desert because of climate changes and 24. people cut down trees and dig up grass. Northwest China is part of the sandstorm centre in Central Asia. Sandstorms sometimes have 25. very bad effect on Beijing,