国际交流英语视听说B4U2.ppt

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1、国国际交流英交流英语视听听说B4U2Think and DiscussViewing the WorldExploring the ThemeAnalytical ListeningSharing Your IdeasEngagingFurther ListeningContentThink and DiscussUnit 2 Unit 2 Protecting Our PlanetProtecting Our PlanetQuestionsAn endangered turtle floats over a dead coral reef.1.Look at the photo and re

2、ad the caption.What do you imagine this scene looked like 50 or 60 years ago?What caused the change?2.What are some reasons that animals become extinct?3.Who do you think should be responsible for protecting endangered species?Governments?Companies?Citizens?Example AnswersFifty or 60 years ago,the s

3、cene was probably much more colorful,with different species of live coral and different kinds of fish.The damage was probably caused by human activities such as commercial fishing or scuba diving.Rising ocean temperatures from global warming can also cause the death of coral reefs.Questions1.Look at

4、 the photo and read the caption.What do you imagine this scene looked like 50 or 60 years ago?What caused the change?Example Answers Species can become extinct due to over-hunting or over-fishing,climate change,loss of habitat,or competition from invasive species.Questions2.What are some reasons tha

5、t animals become extinct?Example Answer 1I think governments should be responsible for protecting endangered species because they have the power to pass and endorse laws that protect the species.Questions3.Who do you think should be responsible for protecting endangered species?Governments?Companies

6、?Citizens?Example Answer 2I think companies should be responsible for protecting endangered species because they sometimes cause environmental damage,and they have financial resources.Saving an endangered species might also be good for a companys public image.Questions3.Who do you think should be re

7、sponsible for protecting endangered species?Governments?Companies?Citizens?Example Answers 3I think citizens should be responsible for protecting endangered species because governments and companies have not done enough.Citizens should join together to protect these species through education and pub

8、lic pressure on companies and governments.Questions3.Who do you think should be responsible for protecting endangered species?Governments?Companies?Citizens?Exploring the ThemeUnit 2 Unit 2 Protecting Our PlanetProtecting Our PlanetProtecting Our PlanetInternational Union for Conservation of Nature(

9、IUCN):the worlds oldest and largest global environmental organization founded in 1948.With more than 1,200 member organizations,today it is a leading authority on the environment protection and sustainable development.Almost 11,000 scientists and experts from the world do volunteer work for it.世界自然保

10、护联盟A|Look at the photos and read the captions.Then discuss the questions.1.Lions and other types of big cats are dying at a rapid rate.What do you think is the biggest threat to these animals?2.If a plant species becomes extinct,what effect does this have on the environment?Protecting Our PlanetAn A

11、frican lion rests near a tree in Botswana.Over the past 20 years,many African lions have died.Protecting Our PlanetAround the planet,human impact has resulted in the destruction of animal and plant life.Now conservationists are trying to save these plants and animals from extinction.Once a plant or

12、animal is extinct,there will be no living members of that species left on the planet.Protecting Our PlanetAround the planet,human impact has resulted in the destruction of animal and plant life.Now conservationists are trying to save these plants and animals from extinction.Once a plant or animal is

13、 extinct,there will be no living members of that species left on the planet.Protecting Our PlanetExample AnswersThe biggest threat to big cats is probably hunting.People want their skins,or in some cases,they might think the big cats are a threat to people or to domestic animals.Habitat loss could b

14、e another factor that is endangering big cats.1.Lions and other types of big cats are dying at a rapid rate.What do you think is the biggest threat to these animals?Protecting Our PlanetExample AnswersIf a plant species becomes extinct,then any insect species or animal that depends on it could go wi

15、thout food and shelter.In addition,plants are important to the soil and the air,so losing a plant species could have several negative effects on the environment.2.If a plant species becomes extinct,what effect does this have on the environment?Protecting Our PlanetB|Look at the chart.Then discuss th

16、e questions.Each year,the International Union for Conservation of Nature studies plants and animals.Many of the species studied are threatened or at risk of dying.The graph shows the percentage of threatened species in each category.The numbers at the top of the bars show how many species were studi

17、ed.Protecting Our Planet1.Which group is the most threatened?Which is the least?2.Which categories of species are common in China?Protecting Our PlanetExample Answers Tropical palms have the greatest percentage of species in danger,while lobsters,on the other hand,have the smallest percentage and nu

18、mber of species in danger.Therefore,tropical palms are the most threatened and lobsters are the least threatened.1.Which group is the most threatened?Which is the least?Protecting Our PlanetExample AnswersAll of the categories of species are common in China except for tropical palms,which can be onl

19、y seen in several provinces.Coral reefs used to be common in the oceans around China,but a majority of the reefs have been destroyed due to over-fishing and pollution.2.Which categories of species are common in China?Protecting Our PlanetAnalytical ListeningUnit 2 Unit 2 Protecting Our PlanetProtect

20、ing Our PlanetListening 1 dusky seaside sparrow n.海滨灰雀（主要分布在美国佛罗里达州的梅里特岛，已经绝迹）habitat n.（植物的）生长地；（动物的）栖息地Merritt Island 梅里特岛（位于美国东部佛罗里达州）steelhead trout n.硬头鳟enforce v.执行，实施（规定或法律）Idaho 爱达荷州（美国西北部州）deforestation n.砍伐树林buckwheat n.荞麦Listening 1 Endangered Species Act(ESA):a U.S.environmental law whic

21、h was passed in 1973.It was designed to help protect plants and animals that are threatened by extinction as a result of human activities.濒危物种法案Listening 1 People generally speak more quickly than they can write.To take good notes quickly while listening to a lecture,we should write only the most im

22、portant ideas.Here are some tips:Write only the key words.Dont write complete sentences.Use abbreviations(short forms)and symbols when possible.Indent specific information,such as examples.A|Predicting Content.Form a group with two or three other students.Look at the photos and read the caption.Then

23、 discuss the questions below.Listening 1 The dusky seaside sparrow was a bird species of southern Florida.A|Predicting Content.Listening 1 1.The dusky seaside sparrow is now extinct.What kind of habitat do you think this bird lived in?2.What do you think are some possible causes for its extinction?L

24、istening 1 Example Answers1.The dusky seaside sparrow is now extinct.What kind of habitat do you think this bird lived in?The bird is sitting on a branch,so it must have lived in places with trees.Southern Florida is also a warm place with a lot of wetlands.Listening 1 Example Answers2.What do you t

25、hink are some possible causes for its extinction?The bird may have become extinct because of habitat loss,environmental pollution,or disease.(Its a small bird,so people wouldnt want to hunt it.)B|Note-Taking.Listen to the first part of a guided tour and look at a students notes.Notice the use of key

26、 words,indentations,abbreviations,and symbols.Listening 1 C|Pair Work.Work with a partner.Using the notes from exercise B,retell the first part of the guided tour in complete sentences.Use your own words.Listening 1 Listening 1 Example AnswersThe dead bird in the jar is the dusky seaside sparrow,a s

27、mall bird that lived on Merritt Island in southern Florida,but which is now extinct.The species became extinct when people used chemicals to kill the mosquitos on the island.Those chemicals altered the wetlands so they were no longer a good habitat for the sparrow.Tour Guide:OK,everyone,heres our ne

28、xt exhibit.Do you see the body of the little bird in that bottle?That is a dusky seaside sparrow.It was an old male that died on June 16,1987.Its kind of sad because he was the very last dusky seaside sparrow in the world.Theyre now extinct.Yes,you have a question?Male:Do you know why they became ex

29、tinct?Tour Guide:Basically,they lost their habitat.See,the dusky seaside sparrow lived only in one placeon Merritt Island in Florida.The island had a lot of mosquitoes and wetlands.The people on Merritt Island used chemicals to kill the mosquitoes.Those chemicals were also very harmful to the sparro

30、ws,and many died.In addition,the people on Merritt Island tried to control and exploit the wetlands.As they altered them,the wetlands were no longer a good habitat for the sparrows.The birds died one by one until there werent any left.Listening 1 A|Note-Taking.Listen to the guided tour and complete

31、the notes.Be sure to use key words,abbreviations,and symbols.Notice the indentations.A Guided TourListening 1 Endangered Species Act(ESA)1973Protects animals and their _ Ex.:_Ongoing conflict between _ and _ Ex.:_ESA protects _;ranchers feellaw violates _habitatssteelhead trout in Washington statela

32、ndownersgovernmentgray wolf in Wyoming and Idaholandtheir rightsA|Note-Taking.Listening 1 Endangered Species TodaySituation today is _ than in 19731._ species listed as _ or _2.Since 1973 only _ species removed from list3.BUT only _ removed because they recovered;_ became extinct,others listed by mi

33、stake4._ more species may soon be added to listworse 1,300endangeredthreatened39149300A|Note-Taking.Listening 1 ConclusionEven w/ESA in place,_ not making much progressListening 1 B|Listening for Main Ideas.Read the questions and answer choices.Then listen again and choose the correct answers.Use yo

34、ur notes from exercise A to help you.1.What is the main topic of the talk?a.Why the dusky seaside sparrow became extinct.b.The difficulties of protecting both animals and their habitats.c.Reasons that the Endangered Species Act isnt working.bListening 1 B|Listening for Main Ideas.Read the questions

35、and answer choices.Then listen again and choose the correct answers.Use your notes from exercise A to help you.2.What does the Endangered Species Act protect?a.Endangered animals and their habitats.b.Endangered animals but not their habitats.c.Animal habitats but not endangered animals.aListening 1

36、B|Listening for Main Ideas.Read the questions and answer choices.Then listen again and choose the correct answers.Use your notes from exercise A to help you.3.What has happened since the passage of the Endangered Species Act?a.The number of species that are endangered has greatly decreased.b.The num

37、ber of species that are endangered has increased a lot.c.The number of species that are endangered has not changed much.cListening 1 The Miami blue butterflyDiscussion.Work with your partner.How might the extinction of the dusky seaside sparrow have been prevented?Explain your ideas.Tour Guide:OK,ev

38、eryone,heres our next exhibit.Do you see the body of the little bird in that bottle?That is a dusky seaside sparrow.It was an old male that died on June 16,1987.Its kind of sad because he was the very last dusky seaside sparrow in the world.Theyre now extinct.Yes,you have a question?Male:Do you know

39、 why they became extinct?Tour Guide:Basically,they lost their habitat.See,the dusky seaside sparrow lived only in one placeon Merritt Island in Florida.The island had a lot of mosquitoes and wetlands.The people on Merritt Island used chemicals to kill the mosquitoes.To be continued Listening 1 Tour

40、Guide:Those chemicals were also very harmful to the sparrows,and many died.In addition,the people on Merritt Island tried to control and exploit the wetlands.As they altered them,the wetlands were no longer a good habitat for the sparrows.The birds died one by one until there werent any left.Female:

41、So,if people were to blame,cant we make sure something like that never happens again?Tour Guide:Were trying.The situation with the dusky seaside sparrow makes one thing very clear.We need to protect endangered animals.However,its a better strategy to protect the animals andtheir habitats,too.After a

42、ll,if an animals habitat is destroyed,the animal will likely become extinct.To be continued Listening 1 Tour Guide:Were trying.The situation with the dusky seaside sparrow makes one thing very clear.We need to protect endangered animals.However,its a better strategy to protect the animals andtheir h

43、abitats,too.After all,if an animals habitat is destroyed,the animal will likely become extinct.Thats why the Endangered Species Act,which was passed in the United States in 1973,protects both endangered animals and their habitats.For example,the steelhead trout lives in rivers and streams on the wes

44、t coast of the United Statesthe Columbia River in Washington state for instance.Recently,both the fish and the river came under the protection of the Endangered Species Act.To be continued Listening 1 Male:But how can we protect large areas such as rivers and forests?No onenot even the governmentcan

45、 afford to buy or control all the land that endangered species live on.Tour Guide:Good point.In fact,thats what makes the Endangered Species Act difficult to fully enforce.Theres an ongoing conflict between some landowners and the government.Take the case of the gray wolf,for instance.At one time,th

46、e wolves were common all over North America,but by the 1930s they were nearly all killed.Then in 1973,the wolves came under the protection of the Endangered Species Act,along with huge areas of landin Wyoming and Idaho,for example.This angered ranchers.They think they should have the right to shoot

47、wolves that threaten their sheep and cows.To be continued Listening 1 Tour Guide:So,landowners may understand the need for the protection of endangered species,but its understandable that they might also feel that the Endangered Species Act violates their rights.Yes?Female:Is the law working?I mean,

48、what is the status of endangered species today in the United States?Tour Guide:Unfortunately,the situation of threatened and endangered animals is worse now than in 1973,even with the Endangered Species Act in place.Reports on topics such as habitat loss,deforestation,and overfishing show that the s

49、ituation for many species is far worse now than it was in 1973.Let me be more specific.Right now over 1,300 species in the United States are listed as endangered or threatened.Listening 1 To be continued Tour Guide:And,its important to keep in mind that not many species are ever taken off the list.S

50、ince 1973,in fact,only around 39 species have been removed from the Endangered Species list.But that number doesnt indicate the complete story.Whats significant about that number is that only 14 species were removed because they had actually recovered.Nine species became extinct,and the others were