新世纪大学英语第二版综合教程第4册Unit1ppt课件

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1、Read and ExploreUnit 1 Man and Nature Get StartedListen and RespondOptional Classroom ActivitiesEnhance Your Language Awareness新世纪大学英语系列教材（第二版）综合教程4Unit1GetStarted3Watching and DiscussionDiscussionQuotes 1. Do you think man lives in harmony with nature now? 2. Do you think that man has been destroyi

2、ng nature? Could you give some examples?3. What do you think we should do to preserve nature?Workinpairsorgroupsanddiscussthefollowingquestions.Get started-Discussion新世纪大学英语系列教材（第二版）综合教程4Unit1GetStarted4DiscussionQuotes Watching and DiscussionStudy the following quotes about man and nature anddiscus

3、sinpairswhatyoucanlearnfromthem. Get started-Quotes新世纪大学英语系列教材（第二版）综合教程4Unit1GetStarted5DiscussionQuotes Watching and DiscussionStudy nature, love nature, stay close to nature. It will never fail you. Frank Lloyd Wright Interpretation:As an architect, Wright emphasizes the importance of loving and s

4、tudying nature. We should observe nature, take care of it and live in harmony with it. And then we will never feel disappointed with it. Get started-QuotesClick Picture新世纪大学英语系列教材（第二版）综合教程4Unit1GetStarted6DiscussionQuotes Watching and DiscussionLook deep into nature, and then you will understand eve

5、rything better. Albert Einstein Interpretation:As a scientist, Einstein believes that a close study of nature will help us better understand things. Get started-QuotesClick Picture新世纪大学英语系列教材（第二版）综合教程4Unit1GetStarted7DiscussionQuotes Watching and DiscussionWe do not see nature with our eyes, but wit

6、h our understandings and our hearts. William Hazlitt Interpretation:As a writer, Hazlitt urges us to love and appreciate nature heart and soul. Get started-QuotesClick Picture新世纪大学英语系列教材（第二版）综合教程4Unit1GetStarted8DiscussionQuotes Watching and DiscussionThe highest purpose is to have no purpose at all

7、. This puts one in accord with nature, in her manner of operation. John Cage Interpretation:Mans ideal life is to be integrated into nature, so we should respect nature and follow its laws. Get started-QuotesClick Picture新世纪大学英语系列教材（第二版）综合教程4Unit1GetStarted9Watching and DiscussionDiscussionQuotes Wa

8、tchthefollowingvideoclip“Iftheworldwarmsby6degrees”anddothetasksthatfollow:videoclick here新世纪大学英语系列教材（第二版）综合教程4Unit1GetStarted10Watching and DiscussionDiscussionQuotes If the world warms by 6 degrees, from a distance the may appear bright blue, but they are marine wastelands. Deserts across continen

9、ts like conquering armies. become common events. Some of the worlds great cities are and abandoned. If temperatures soar by 6 degrees within , were going to face nothing less than a global wipe out. floodedvideo1.Fillinthemissingwordsaccordingtowhatyouhearfromthevideoclip.Video-1_march_Natural disas

10、ters_oceans_less than a century_click here新世纪大学英语系列教材（第二版）综合教程4Unit1GetStarted11Watching and DiscussionDiscussionQuotes Video-22. What do you think are other possible consequences of awarmerclimate? (Open.) click hereUnit1ListenandRespond12Word BankTask One Task Two 新世纪大学英语系列教材（第二版）综合教程4marine a. of

11、, near, living in, or obtained from the sea （近）海的；海生（产）的 fishery n. a part of the sea used for the business of catching sea fish 近海渔场 exhaust vt. use up completely 用完，用尽 Listen and Respond Word BankUnit1ListenandRespond13Word BankTask One Task Two 新世纪大学英语系列教材（第二版）综合教程4endanger vt. cause danger to 使遭

12、危害，危及 excessive a. too much; too great; going beyond what is reasonable or right 过多的，过分的，过度的 starvation n. U suffering or death from lack of food 挨饿，饥饿；饿 死 Listen and Respond Word BankUnit1ListenandRespond14Task One Word Bank新世纪大学英语系列教材（第二版）综合教程4Task Two Choosethebestanswertoeachofthefollowingquesti

13、onsaccording to the information contained in the listeningpassage.L&R 1Unit1ListenandRespond15Task One Word Bank新世纪大学英语系列教材（第二版）综合教程4Task Two 1.What is the main idea of the passage?L&R 1A) The importance of seafood supplies.B) The fish harvest in the North Atlantic.C) The decline in fish supplies in

14、 the sea.D) The importance of protecting sea resources.Unit1ListenandRespond16Task One Word Bank新世纪大学英语系列教材（第二版）综合教程4Task Two 2. What did people in Europe and America in the 19th century think about marine resources? L&R 1A) They thought that marine resources were almost exhausted.B) They thought th

15、at marine resources were seriously destroyed.C) They thought that marine resources were unlimited.D) They thought that marine resources were endangered.Unit1ListenandRespond17Task One Word Bank新世纪大学英语系列教材（第二版）综合教程4Task Two 3. Why are the threats to fish more alarming than the threats to animals and

16、birds? L&R 1A) Because fish is a much needed food resource.B) Because plenty of fish is killed every year.C) Because fish is the only diet for many people.D) Because the sea fisheries are going to be exhausted.Unit1ListenandRespond18Task One Word Bank新世纪大学英语系列教材（第二版）综合教程4Task Two 4. How much fish is

17、 harvested in the North Atlantic every year? L&R 1A) 12 billion pounds.B) 12 million pounds.C) 20 billion pounds.D) 20 million pounds.Unit1ListenandRespond19Task One Word Bank新世纪大学英语系列教材（第二版）综合教程4Task Two A) Natural resources will be exhausted within the next few years.B) Fish reserves will be destr

18、oyed within the next few years because of excessive fishing.C) People in some parts of the world will face starvation because of the drought.D) Peoples demand on fish will decline in some parts of the world. 5. What warning do scientists give in the passage? L&R 1Unit1ListenandRespond20Task TwoWord

19、BankTask One新世纪大学英语系列教材（第二版）综合教程4L&R 2Listentotherecordingagainandfillineachoftheblanksaccordingtowhatyouhaveheard.Unit1ListenandRespond21Task TwoWord BankTask One新世纪大学英语系列教材（第二版）综合教程4diet Today though, there is evidence showing that marine resources are as seriously as those of the land and the air

20、. In fact, in some ways the to fish are more alarming than the threats to animals and birds. This is because fish is a much needed food , as people throughout the world depend on fish as an important part of their . It is reported that to food demands, 20 billion pounds of fish are every year in the

21、 L&R 2endangered_threats_resource_satisfy_harvested_Unit1ListenandRespond22Task TwoWord BankTask One新世纪大学英语系列教材（第二版）综合教程4North Atlantic alone. Sea resources are also rapidly in many other parts of the world. Scientists now believe that food from the sea wont last forever. They warn that fishing will

22、 destroy fish reserves within the next few years. They also warn that the decline in fish supply will cause in some parts of the world.L&R 2supplies_declining_excessive_starvation_Unit1ReadandExplore Text ADiscovering the Main IdeasIn-Depth StudyVoicing Your Views23新世纪大学英语系列教材（第二版）综合教程41. Does man t

23、end to become less dependent on nature with the rapid development of society? Why or why not? 2. What does the author think about the present relationship between man and nature? 3. Whats the distinct feature of modern technology according to the passage? 4. Whats the solution to the ecological cris

24、is according to the author? 5. Whats the authors attitude towards the human transformation of nature?Main Idea-1Exercise 1: Answer the following questions with theinformationcontainedinTextA.Unit1ReadandExplore Text ADiscovering the Main IdeasIn-Depth StudyVoicing Your Views24新世纪大学英语系列教材（第二版）综合教程4Ma

25、in Idea-2Exercise 2: Text A can be divided into four parts with theparagraphnumber(s)ofeachpartprovidedasfollows.Writedownthemainideaofeachpart.Unit1ReadandExplore Text ADiscovering the Main IdeasIn-Depth StudyVoicing Your Views25新世纪大学英语系列教材（第二版）综合教程4Main Idea-2PartParas.Main Idea I1-2II3-4III5-7IV8

26、-9Main Idea-2 Man lives in the realm of nature. He is connected with nature by “blood” ties and he cannot live outside nature. As society develops, man tends to become less dependent on nature directly, while indirectly his dependence grows because it is increasingly difficult to obtain irreplaceabl

27、e natural resources for the needs of production. At present Mother Nature is being exhausted in resources, contaminated by synthetic products, and troubled by ecological imbalance. The previous dynamic balance between man and nature and between nature and society as a whole has shown ominous signs o

28、f breaking down. The solution to man-nature relation lies in rational and wise organization of both production itself and care for Mother Nature by all humanity. Unit1ReadandExplore Text ADiscovering the Main IdeasIn-Depth Study26新世纪大学英语系列教材（第二版）综合教程4Voicing Your ViewsNaturenurturesmankindunselfishl

29、ywithitsrichresources.Yet,manissocarriedawayinhistransformationofnaturethat he is unaware that it also has limitations and needsconstant care. Now worn by the excessive demands ofmankind,natureisunabletomaintaintheecologicalbalanceneeded.Humanityisfacedwiththeproblemofhowtostop,oratleasttomoderate,t

30、hedestructionofMotherNature.In-DepthUnit1ReadandExplore Text ADiscovering the Main IdeasIn-Depth Study27新世纪大学英语系列教材（第二版）综合教程4Voicing Your Views1 Human beings live in the realm of nature. They are constantly surrounded by it and interact with it. Man is constantly aware of the influence of nature in

31、the form of the air he breathes, the water he drinks, and the food he eats. We are connected with nature by “blood” ties and we cannot live outside nature. In-DepthMan in the Realm of Nature Alexander SpirkinUnit1ReadandExplore Text ADiscovering the Main IdeasIn-Depth Study28新世纪大学英语系列教材（第二版）综合教程4Voi

32、cing Your ViewsIn-Depth2 Man is not only a dweller in nature, he also transforms it. Humanity converts natures wealth into the means of the cultural, historical life of society. Man has subdued and disciplined electricity and it to serve the interests of society. Not only has man various species of

33、plants and animals to different climatic conditions, he has also changed the shape and climate of his environment and transformed plants and animals. compelledtransferredUnit1ReadandExplore Text ADiscovering the Main IdeasIn-Depth Study29新世纪大学英语系列教材（第二版）综合教程4Voicing Your Viewsregarded as something h

34、ostile to man. The forest, for example, was something wild and frightening and people tried to force it to retreat. This was all done in the name of civilisation, which meant the places where man had made his home, where the earth was cultivated, where the forest had been cut down.3 As society devel

35、ops, man tends to become less dependent on nature directly, while indirectly his dependence grows. Our distant ancestors lived in fear of natures destructive forces. Very often they were unable to obtain the merest daily necessities. However, despite their imperfect tools, they worked together stubb

36、ornly, collectively, and were able to attain results. Nature was also changed through interaction with man. Forests were destroyed and the area of farmland increased. Nature with its elemental forces wasIn-DepthUnit1ReadandExplore Text ADiscovering the Main IdeasIn-Depth Study30新世纪大学英语系列教材（第二版）综合教程4

37、Voicing Your Viewsreplaceable resources of the biosphere has become particularly acute. It is getting more and more difficult to satisfy the needs of human beings and society even for such a substance, for example, as fresh water. The problem of eliminating industrial waste is also becoming increasi

38、ngly complex. 4 But as time goes on mankind becomes increasingly concerned with the question of where and how to obtain irreplaceable natural resources for the needs of production. Science and mans practical transforming activities have made humanity aware of the enormous geological role played by t

39、he industrial transformation of the earth. 5 At present the previous dynamic balance between man and nature and between nature and society as a whole has shown ominous signs of breaking down. The problem of the so-called In-DepthUnit1ReadandExplore Text ADiscovering the Main IdeasIn-Depth Study31新世纪

40、大学英语系列教材（第二版）综合教程4Voicing Your Viewssynthetic, glittering fabrics that are obviously not good for them. Young people may hardly feel this, and they pay more attention to appearance than to health. But they become more aware of this harmful influence as they grow older. 7 As time goes on the syntheti

41、c output of production turns into waste, and then substances that in their original form were not very toxic are transformed in the cycle of natural processes into aggressive agents. Today both natural scientists and philosophers are asking themselves the question: Is mans destruction of the biosphe

42、re inevitable? 6 Modern technology is distinguished by an ever increasing abundance of produced and used synthetic goods. Hundreds of thousands of synthetic materials are being made. People increasingly cover their bodies from head to foot in nylon and otherIn-DepthUnit1ReadandExplore Text ADiscover

43、ing the Main IdeasIn-Depth Study32新世纪大学英语系列教材（第二版）综合教程4Voicing Your Viewsto use such resources as solar energy, the power of winds, the riches of the seas and oceans and other, as yet unknown natural forces of the universe.9 But to return to our theme, the bitter truth is that those human actions wh

44、ich violate the laws of nature, the harmony of the biosphere, threaten to bring disaster and this disaster may turn out to be universal. How apt then are the words of ancient Oriental wisdom: live closer to nature, my friends, and its laws will protect you! 8 The man-nature relation the crisis of th

45、e ecological situation is a global problem. Its solution lies in rational and wise organization of both production itself and care for Mother Nature, not just by individuals, enterprises or countries, but by all humanity. One of the ways to deal with the crisis situation in the “man-nature” system i

46、s In-DeptheternalUnit1ReadandExplore Text AVoicing Your Views33新世纪大学英语系列教材（第二版）综合教程4In-Depth StudyDiscovering the Main IdeasvoicingInoureverydaylife,wemayfindlotsofinstancesofnature-unfriendlybehaviour.Nowworkinpairsorgroupsandfillinthe table with some such instances and then offer yoursuggestionsor

47、possiblesolutions.Shareyourviewswiththewholeclass.Unit1ReadandExplore Text AVoicing Your Views34新世纪大学英语系列教材（第二版）综合教程4In-Depth StudyDiscovering the Main IdeasvoicingNature-unfriendly Behaviour Suggestions & Solutions Driving private cars is becoming fashionable. Promoting the use of public transporta

48、tion. Abusive use of exhaustible resources has caused serious environmental problems. Developing inexhaustible resour-ces such as solar energy, wind power, etc. Disposable plastic lunch boxes are over-used in restaurants. Using ones own lunch boxes. Plastic bags are excessively used for packing. Bri

49、nging ones own cloth or paper bags when shopping. Lights or water taps are often left on in pubic places. Turning off the lights or water taps after use. Potentially toxic wastes such as used batteries are thrown away at random. Setting up separate litter bins for disposal of potentially toxic waste

50、s such as used batteries. Unit1ReadandExplore Text BKey Words and ExpressionsDifficult SentencesComprehension Questions35新世纪大学英语系列教材（第二版）综合教程4Key Words (B)Key Words for Text BtrackbarescrapetipmiraclepilemasssparktherebyemergetriggerconsumehollowUnit1ReadandExplore Text BKey Words and ExpressionsDif

51、ficult SentencesComprehension Questions36新世纪大学英语系列教材（第二版）综合教程4Key Words (B)Expressions for Text Bsweep sb. up cope with tough it out search out up to nothing short of thaw out settle in Unit1ReadandExplore Text BKey Words and ExpressionsDifficult Sentences37新世纪大学英语系列教材（第二版）综合教程4Comprehension Questio

52、ns昨夜刚刚下了一场大雪，像白桦树皮那样洁白，白雪皑皑的大地上什么也没有，只有我自己的足迹，仿佛是缝在桦树皮上的一行细密针脚。 2) Please translate the sentence into Chinese.1. No tracks but my own are stitched into the dusting of fresh snow, white as birch bark, that fell during the night. (Para. 1) Metaphor (“ are stitched into”, walking in the snow is compare

53、d to the sewing of clothes) and simile (“white as birch bark”, the color of snow is compared to that of the birch bark). Sentences1) Please identify the figures of speech used in this sentence. Unit1ReadandExplore Text BKey Words and ExpressionsDifficult Sentences38新世纪大学英语系列教材（第二版）综合教程4Comprehension

54、 Questions2. The sight of flakes parachuting onto the front lawn, which swept you up in December, now just means you have to scrape your car windshield. (Para. 3) 2) Please translate the sentence into Chinese.片片雪花飘落在房前的草坪上，要是在12月份，这景象会让你产生飘然于天地之间的感觉，而此刻，这意味着你得刮除汽车挡风玻璃上的积雪。 The (very) sight of him ma

55、kes me sick. Sentences1) Make a sentence with the italicized structure. Unit1ReadandExplore Text BKey Words and ExpressionsDifficult Sentences39新世纪大学英语系列教材（第二版）综合教程4Comprehension Questions3. The survival of some species seems nothing short of miraculous. (Para. 9) 2) Please translate the sentence in

56、to Chinese.有些物种的存活简直就是奇迹。 To do that would be nothing short of suicide. Sentences1) Make a sentence with the italicized structure. Unit1ReadandExplore Text BKey Words and ExpressionsDifficult Sentences40新世纪大学英语系列教材（第二版）综合教程4Comprehension Questions4. Each track, each piece of bird song, each frozen s

57、eed, is an affirmation of life, a defiance to the cold, a promise. (Para. 17) 2) Please translate the sentence into Chinese.每一个足迹，每一声鸟鸣，每一粒冰冻的种子，都是对生命的一种肯定，对寒冷的一种抗争，也是一个希望。 The basic structure of the sentence is “A is B”, and both “A” and “B” consist of three nominal phrases, which help the sentence

58、 nicely balanced.Sentences1) Comment on the parallel structure of the sentence. Unit1ReadandExplore Text BComprehension Questions41新世纪大学英语系列教材（第二版）综合教程4Difficult SentencesKey Words and ExpressionsComprehensionParas.1-2Q1Q1Q2Q2What can we learn about the authors feelings from Para. 1? What can we lea

59、rn from the word “halfheartedly” in Para. 2? Q3Q3What is the weather like in winter in the place where the author is settled? Unit1ReadandExplore Text BComprehension Questions42新世纪大学英语系列教材（第二版）综合教程4Difficult SentencesKey Words and ExpressionsQ QPara.3ComprehensionWhat does the author think of snow i

60、n winter?Para.3Unit1ReadandExplore Text BComprehension Questions43新世纪大学英语系列教材（第二版）综合教程4Difficult SentencesKey Words and ExpressionsPara.3ComprehensionQ1Q1Q2Q2What did people use to think about the seasonal change from winter to spring, according to the paragraph? What can be inferred from the senten

61、ce about birds changing into other animals? What is really happening? Para.4Unit1ReadandExplore Text BComprehension Questions44新世纪大学英语系列教材（第二版）综合教程4Difficult SentencesKey Words and ExpressionsParas.5-7ComprehensionQ4Q4Q1Q1Q2Q2Q3Q3What are the two basic options open to wildlife to survive winter? How

62、 do butterflies, reindeers, and gray whales survive winter? Do all animals travel a long distance to get through the harsh winter? What is a microclimate in your opinion? Would you give an example of the existence of a microclimate in our surroundings? Unit1ReadandExplore Text BComprehension Questio

63、ns45新世纪大学英语系列教材（第二版）综合教程4Difficult SentencesKey Words and ExpressionsPara.1ComprehensionQ1Q1Q2Q2Q3Q3How do musk oxen cope with cold? How do polar bears cope with the cold? What does the author think of the survival of chickadees? Paras.8-9Unit1ReadandExplore Text BComprehension Questions46新世纪大学英语系列教

64、材（第二版）综合教程4Difficult SentencesKey Words and ExpressionsPara.1ComprehensionQ1Q1Q2Q2How do chickadees survive winter? What does “a trick” in the last sentence in Para. 12 refer to? Paras.10-12Unit1ReadandExplore Text BComprehension Questions47新世纪大学英语系列教材（第二版）综合教程4Difficult SentencesKey Words and Expre

65、ssionsPara.1ComprehensionQ1Q1Q2Q2Q3Q3Why did the author tap the ice on top of a small creek? How do bears hibernate in winter? What is the bears belief according to the author? Paras.13-15Unit1ReadandExplore Text BComprehension Questions48新世纪大学英语系列教材（第二版）综合教程4Difficult SentencesKey Words and Express

66、ionsQ QPara.1ComprehensionWhat do you think is the main idea of the text? Paras.16-18Unit1OptionalClassroomActivities49新世纪大学英语系列教材（第二版）综合教程4OptionalActivity 1: The text tells us how some animals survive the cold winter. Complete the following table by listing the animals and the ways and means they

67、have devised to cope with the cold in winter. Unit1OptionalClassroomActivities50新世纪大学英语系列教材（第二版）综合教程4OptionalTypes of animals Ways and means to cope with the cold in winter Birds of different species Migrating to warmer climates. Butterfly Migrating to warmer climates (Traveling sometimes 4,000 mile

68、s to Mexico, Texas and California). Reindeer Migrating to warmer climates (Streaming out of the high Arctic with the first frosts of winter). Gray whale Migrating to warmer climates (travelling thousands of miles seeking warmth, food and sunlight). Elk Making short trips to warmer local areas (Movin

69、g from high country to nearby valleys). Bald eagle Making short trips to warmer local areas (Seeking open water). White tailed deer Making short trips to warmer local areas (Searching out a south-facing slope to catch the morning sun). Unit1OptionalClassroomActivities51新世纪大学英语系列教材（第二版）综合教程4OptionalT

70、ypes of animals Ways and means to cope with the cold in winter Musk ox Standing with their backs to the below-zero wind, slowly breathing through nostrils that warm the super-cooled winter air. Polar bear Laying on layers of fat up to seven inches thick beneath a coat of fur with nearly 10,000 hairs

71、 per square inch; Having rough footpads skid-resistant on the ice. Chickadee Eating twice as much food in winter as in summer to accumulate a layer of fat that will burn slowly through the cold night; Having 30 percent more feathers in winter which can be fluffed up, trapping a layer of warm air; Dr

72、opping body temperatures as much as 20 degrees below the normal 104, thereby slowing energy consumption. Unit1OptionalClassroomActivities52新世纪大学英语系列教材（第二版）综合教程4OptionalTypes of animals Ways and means to cope with the cold in winter Wood frog Being frozen solid, like lumps of ice in winter;Thawing ou

73、t in the coming spring by flooding its bloodstream with glucose. Snakes In the same way as wood frogs. Unit1OptionalClassroomActivities53新世纪大学英语系列教材（第二版）综合教程4OptionalActivity 2: Work in groups and conduct research on any species of wildlife that you are interested in, focusing on how they survive wi

74、nter. Present your findings to the whole class. Unit1EnhanceYourLanguageAwarenessUseful ExpressionsTheme-Related Writing54新世纪大学英语系列教材（第二版）综合教程4Grammar in ContextUseful Expressions-AUseful Expressions from Text AChinese Equivalencesinteract with be aware of compel sb. to do sth. tend to live in fear

75、of be regarded as hostile to 与与互动互动 意识到，注意到意识到，注意到 迫使某人做某事迫使某人做某事 倾向于倾向于 生活在对生活在对的恐惧之中的恐惧之中 被视为被视为 不利于不利于 Unit1EnhanceYourLanguageAwarenessUseful ExpressionsTheme-Related Writing55新世纪大学英语系列教材（第二版）综合教程4Grammar in ContextUseful Expressions-AUseful Expressions from Text BChinese Equivalencesin the name

76、 of show signs of be concerned with satisfy the needs of from head to foot violate the laws of nature 以以的名义的名义 显示出显示出的迹象的迹象 关心关心 满足满足的需求的需求 从头到脚；全身从头到脚；全身 违背自然规律违背自然规律 Unit1EnhanceYourLanguageAwarenessUseful ExpressionsTheme-Related Writing56新世纪大学英语系列教材（第二版）综合教程4Grammar in ContextUseful Expressions-

77、AUseful Expressions from Text BChinese Equivalencestough it out bend under the weight of stream out of span the globe take advantage of up to 苦熬苦熬 被被压弯压弯 成群结队地离开成群结队地离开 长途跋涉长途跋涉 利用利用 多达多达，直到，直到 Unit1EnhanceYourLanguageAwarenessUseful ExpressionsGrammar in Context57新世纪大学英语系列教材（第二版）综合教程4Theme-Related

78、Writing现在分词作状语现在分词作状语一、现在分词短语作时间状语：一、现在分词短语作时间状语：1分词动作一发生，谓语动作紧跟着发生，用现在分词的一般式作时间状语，其逻辑主语为句中的主语。常用的动词有：hear, see, arrive, return, get to, look, open, close, leave, turn around, walk等，表示一个极短暂动作。如： Hearing their teachers voice, the pupils stopped talking at once. 2谓语动作发生在分词所表示的动作过程之中，用when / while + 现在

79、分词的一般式，分词的逻辑主语为句中的主语。如： Dont be careless when /while having an exam. 3分词所表示的动作完成之后，谓语动作才发生，则用现在分词的完成式，即having done的形式。分词的逻辑主语应是句中的主语。如： Having finished his homework, the boy was allowed to watch TV play. Grammar*Unit1EnhanceYourLanguageAwarenessUseful ExpressionsGrammar in Context58新世纪大学英语系列教材（第二版）综

80、合教程4Theme-Related Writing二、现在分词在句中作原因状语二、现在分词在句中作原因状语1分词短语在句中作原因状语时，相当于一个原因状语从句。当分词所表示的动作与谓语动作同时发生或几乎同时发生时，用分词的一般形式。如： Not knowing how to work out the difficult physics problem, he asked the teacher for help.2分词表示的动作发生在谓语动作之前时，可以用现在分词的完成式在句中作原因状语。如： Having lived with the girl for 5 years, we all kno

81、w her very well.Grammar*Unit1EnhanceYourLanguageAwarenessUseful ExpressionsGrammar in Context59新世纪大学英语系列教材（第二版）综合教程4Theme-Related Writing三、现在分词短语在句中作条件状语三、现在分词短语在句中作条件状语现在分词短语在句中作条件状语时，其逻辑主语为句中的主语，该短语相当于一个条件状语从句。如：Turning to the left, you will find the path leading to the park. 四、现在分词短语在句中作让步状语四、现在分

82、词短语在句中作让步状语现在分词短语在句中作让步状语时，其逻辑主语是句中的主语，相当于一个让步状语从句，有时分词前可以带有连接词although, whether, even if, even though。如：Weighing almost one hundred jin, the stone was moved by him alone.Grammar*Unit1EnhanceYourLanguageAwarenessUseful ExpressionsGrammar in Context60新世纪大学英语系列教材（第二版）综合教程4Theme-Related Writing五、现在分词短语

83、在句中作结果状语五、现在分词短语在句中作结果状语现在分词短语在句中可以作结果状语，相当于一个结果状语从句，其逻辑主语是句中的主语。分词短语在句中作结果状语时，通常位于句末，中间有逗号。有时为了加强语气，就在分词前加thus。如：Their car was caught in a traffic jam, thus causing the delay. 六、分词短语在句中表示方式或伴随情况六、分词短语在句中表示方式或伴随情况现在分词短语可表示方式或伴随情况，用来说明动作发生的背景或情况。一般情况下，现在分词所表示的动作与谓语所表示的动作同时发生，它的逻辑主语就是句中的主语，谓语动词作为主要动作，

84、而现在分词表示一个陪衬动作。如：The children ran out of the room, laughing and talking merrily.Grammar*Unit1EnhanceYourLanguageAwarenessUseful ExpressionsGrammar in Context61新世纪大学英语系列教材（第二版）综合教程4Theme-Related WritingGrammarNow, please do the tasks on Pages 23-24 in yourtextbook. Unit1EnhanceYourLanguageAwarenessGra

85、mmar in ContextTheme-Related Writing62新世纪大学英语系列教材（第二版）综合教程4Useful ExpressionswritingWriteanessayofnolessthan150wordsonthetopic“MyUnderstanding of Environmental Protection”. Your writingshouldcoverthefollowingpoints: the relationship between man and the environment the urgency of environmental protec

86、tion ways to protect the environmentUnit1EnhanceYourLanguageAwarenessGrammar in ContextTheme-Related Writing63新世纪大学英语系列教材（第二版）综合教程4Useful ExpressionswritingSampleWritingMy Understanding of Environmental Protection Man and the environment are closely related. Man relies on the environment for water,

87、food and shelter. A harmonious relationship between man and the environment is essential for human survival on the earth. However, man and the environment have never been on such bad terms as they are now. As society develops, mans transformation of nature has severely polluted his living environmen

88、t. Deforestation leads to changes in rainfall patterns, causing devastating floods, droughts andUnit1EnhanceYourLanguageAwarenessGrammar in ContextTheme-Related Writing64新世纪大学英语系列教材（第二版）综合教程4Useful ExpressionswritingSampleWritingsandstorms. The discharge of chemical pollutants endangers our health a

89、nd the lives of other beings. And mass production has resulted in the shortage of irreplaceable natural resources such as coal and oil. If we take no immediate and effective steps to protect our environment, human beings may be the next species to become extinct. We should do our best to protect our environment by planting more trees, taking care of wildlife, reducing industrial wastes, using renewable energy, and imposing heavy fines on environmentally-unfriendly activities, so as to preserve the environment for future generations. (167 words) Thank You!