新视角研究生英语读说写三单元课后练习答案专业知识讲座.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,文档来源于网络，文档所提供的信息仅供参考之用，不能作为科学依据，请勿模仿。文档如有不当之处，请联系本人或网站删除。,Unit 3:,Reading comprehension,1.In paragraph 1,the author says that we are in the middle of a sixth great extinction.What are these great extinctions?Could you name some.In what way is the current great extinction different from the previous five ones?,The difference lies in the fact that the previous five great extinctions have occurred for natural causes,but the current great extinction has been caused by human activities.,Reference,Ex.I,p.50,Unit 3:,Reading comprehension,2.What is the author trying to do with paragraph 2?,The author gives us some examples to show what human needs have caused the current great extinction.Generally speaking,they are humans needs for survival.,Reference,Unit 3:,Reading comprehension,3.Why did the buffalo and the passenger pigeon in North America become extinct?,Both the buffalo and the passenger pigeon became extinct owing to overhunting by humans.,Reference,Unit 3:,Reading comprehension,4.What point does the author want to illustrate by writing about the European rabbits in paragraph 4?,He wants to illustrate that natural habitats of some native species could be destroyed by the introduction of foreign species.The introduction of European rabbits into Australia is a good example.They multiplied quickly and threatened the habitat of native grazing animals in Australia by eating all the vegetation.,Reference,Unit 3:,Reading comprehension,5.In paragraph 5,the author states that humans endanger other species by destroying their natural habitats.What example does the author give to support this statement?,The example is:The rapid shrinking of rainforest caused the loss of many species that made their homes in it.,Reference,Unit 3:,Reading comprehension,6.What can we learn from paragraph 8?,Each life form occupies a special place in the ecosystem,and the disappearance of any species will affect other species in the ecosystem.But 74 species are dying out every day.,Reference,Unit 3:,Reading comprehension,7.What are the two advantages that biodiversity has over monocultures according to paragraphs 912?,1)Biodiversity makes it possible for useful substances to be found in species we havent got to test or study.,2)Biodiversity will save humanity from being starved to death owing to their great dependence on a small number of species.,Reference,Unit 3:,Reading comprehension,8.In paragraph 10,the author writes about the Pacific yew tree.What makes the Pacific yew tree so highly valued today?What does the author want to tell us by mentioningthis tree?,Because it is discovered that the bark of the Pacific yew tree contains a substance called taxol,which can effectively treat certain kinds of cancer.By mentioning this tree,the author wants to tell us that many species may die out before their value is discovered.,Reference,Unit 3:,Reading comprehension,9.What is the main idea of paragraph 11?,Paragraph 11 mainly tells us that the value of the vast majority of species has yet to be discovered.It is very important for us to protect the diversity of species.If we dont,we will lose species that may turn out to be extremely important to our own survival.,Reference,Unit 3:,Reading comprehension,10.What point is suggested by the last paragraph?,It suggests that its hard to tell whether these protective methods will be effective or not now because the rapid human population growth may make it difficult to put these methods into practice.,Reference,1.Introduction(Paras.12),2.Body(Paras.315),3.Conclusion(Para.16),Text Outline,Unit 3:,Structure of the text,Ex.II,p.51,1.Introduction(Paras.12),We are in the middle of a sixth great extinction,which is caused by _.,Text Outline,Unit 3:,Structure of the text,human activities,2.Body(Paras.315),1)_ that human activities endanger other species.(Paras.35),Text Outline,Unit 3:,Structure of the text,Three major ways,2)The reasons why we should preserve every life-form on earth.(Paras.613),3)Methods of protecting endangered species.(Paras.1415),2.Body(Paras.315),Text Outline,Unit 3:,Structure of the text,1)_ that human activities endanger other species.(Paras.35),Three major ways,A.Human beings _ for their meat,bones,skins or for protecting their crops and livestock.,B.Foreign species introduced by human beings can _.,C.Human beings _ by cutting down forests,building towns,etc.,kill off animals directly,endanger the habitat of native species,destroy animals natural habitats,2.Body(Paras.315),2)The reasons why we should preserve every life-form on earth.(Paras.613),Text Outline,Unit 3:,Structure of the text,A._.,B.The variety of species can add natural beauty.,C.Some species provide humans with economic value.,D.Each life-form _.,E.Biodiversity has obvious advantages over _.,Every life-form has a right to exist,occupies a place within its ecosystem,monocultures,2.Body(Paras.315),3)Methods of protecting endangered species.(Paras.1415),Text Outline,Unit 3:,Structure of the text,A._.,B._.,C.Protecting animals through captive breeding(zoos).,Passing laws,Setting aside national parks and preserves,Text Outline,Unit 3:,Structure of the text,3.Conclusion(Para.16),We Its hard to tell the effectiveness of these protective methods now.The biggest problem remains _.,how to meet the needs of a growing human population,1.The passenger pigeon was a _ example of a species that was made extinct by overhunting.,prime,Unit 3:,Vocabulary,component,monoculture,multiply,conserve,prime,tropical,derive,uncounted,biodiversity,endanger,legislation,captivity,Part A,Ex.V,p.53,Complete the following sentences with words given below,making sure that each word is used in the right form.,2.Climate,soil,water,and air are nonliving _ of an ecosystem.,components,Unit 3:,Vocabulary,component,monoculture,multiply,conserve,prime,tropical,derive,uncounted,biodiversity,endanger,legislation,captivity,3.As a language,English is _ from the Anglo-Saxon,a West Germanic variety,although its current vocabulary includes words from many languages.,derived,component,monoculture,multiply,conserve,prime,tropical,derive,uncounted,biodiversity,endanger,legislation,captivity,Unit 3:,Vocabulary,4.Stopping the loss of _ and limiting climate change are the two most important challenges facing our planet.,biodiversity,component,monoculture,multiply,conserve,prime,tropical,derive,uncounted,biodiversity,endanger,legislation,captivity,Unit 3:,Vocabulary,5.A recent report claims that Microsoft products,with their market dominance,are creating a computing _ thats dangerously susceptible to worms and other attacks.,monoculture,component,monoculture,multiply,conserve,prime,tropical,derive,uncounted,biodiversity,endanger,legislation,captivity,Unit 3:,Vocabulary,6.The December 26,2004 Indian Ocean tsunami was reported to have killed more than 225,000 people,and with _ others missing or losing their homes.,uncounted,component,monoculture,multiply,conserve,prime,tropical,derive,uncounted,biodiversity,endanger,legislation,captivity,Unit 3:,Vocabulary,7.With the invention of blogs,the number of websites that would be interesting to follow each day has _ several times over.,multiplied,component,monoculture,multiply,conserve,prime,tropical,derive,uncounted,biodiversity,endanger,legislation,captivity,Unit 3:,Vocabulary,8.The movie Two Brothers tells the story that two tigers are separated as cubs and taken into _,only to be reunited years later as enemies.,captivity,component,monoculture,multiply,conserve,prime,tropical,derive,uncounted,biodiversity,endanger,legislation,captivity,Unit 3:,Vocabulary,9.In 2000 and again in 2002,the US congress considered _ to limit violent content and more tightly regulate the video games industry in America.,legislation,component,monoculture,multiply,conserve,prime,tropical,derive,uncounted,biodiversity,endanger,legislation,captivity,Unit 3:,Vocabulary,10.These _ projects and educational activities have contributed to wildlife habitat improvement,watershed protection,and forest health.,conservation,component,monoculture,multiply,conserve,prime,tropical,derive,uncounted,biodiversity,endanger,legislation,captivity,Unit 3:,Vocabulary,Part B,1.The environmental changes might have caused the,disappearance,of many species by eliminating food sources,or exposing animals to climatic conditions to which they were not adapted.,A.extinction,B.distinction,C.punctuation,D.destruction,Part B,Ex.V,pp.5354,Choose the word or phrase that is closest in meaning to the,underlined,part of the sentence.,Unit 3:,Vocabulary,1.The environmental changes might have caused the,disappearance,of many species by eliminating food sources,or exposing animals to climatic conditions to which they were not adapted.,A.extinction,B.distinction,C.punctuation,D.destruction,2.The study showed that increasing amounts of bird flu virus were contaminating the birds,surroundings,without the farmers realizing of it.,A.conditions,B.climates,C.habitats,D.ecosystems,Unit 3:,Vocabulary,2.The study showed that increasing amounts of bird flu virus were contaminating the birds,surroundings,without the farmers realizing of it.,A.conditions,B.climates,C.habitats,D.ecosystems,3.While recently becoming the tenth most,crowded,city in the USA,San Jose has also held the title of The Safest Big City in America for the past several years.,A.diverse,B.popular,C.disappointing,D.populous,Unit 3:,Vocabulary,3.While recently becoming the tenth most,crowded,city in the USA,San Jose has also held the title of The Safest Big City in America for the past several years.,A.diverse,B.popular,C.disappointing,D.,populous,4.An internal,inquiry,has begun into whether soccer players received improper housing benefits under the former coaches.,A.examination,B.investigation,C.invasion,D.invitation,Unit 3:,Vocabulary,4.An internal,inquiry,has begun into whether soccer players received improper housing benefits under the former coaches.,A.examination,B.investigation,C.invasion,D.invitation,5.Its our job to prepare bright,ambitious young people for the opportunities offered by what will continue to be the,main,sectors for the 21st century.,A.principle,B.extinguished,C.global,D.keystone,Unit 3:,Vocabulary,5.Its our job to prepare bright,ambitious young people for the opportunities offered by what will continue to be the,main,sectors for the 21st century.,A.principle,B.extinguished,C.global,D.,keystone,6.The teenager who made a dramatic escape after eight years of,confinement,in a windowless cell has agreed to a televised interview this week.,A.captivity,B.prevention,C.preservation,D.limitation,Unit 3:,Vocabulary,6.The teenager who made a dramatic escape after eight years of,confinement,in a windowless cell has agreed to a televised interview this week.,A.,captivity,B.prevention,C.preservation,D.limitation,7.The little group so imperfectly known to us is counterbalanced by multitudes of species,of which there are,numberless,varieties.,A.uncommon,B.prime,C.uncounted,D.rare,Unit 3:,Vocabulary,7.The little group so imperfectly known to us is counterbalanced by multitudes of species,of which there are,numberless,varieties.,A.uncommon,B.prime,C.,uncounted,D.rare,8.The,protection,of tropical rainforests as public good will require cooperation between all countries in the world.,A.institution,B.conservation,C.precaution,D.construction,Unit 3:,Vocabulary,8.The,protection,of tropical rainforests as public good will require cooperation between all countries in the world.,A.institution,B.,conservation,C.precaution,D.construction,9.Taken before or while drinking,many medications will,increase,the effects of alcohol on your body.,A.expand,B.multiply,C.enlarge,D.extend,Unit 3:,Vocabulary,9.Taken before or while drinking,many medications will,increase,the effects of alcohol on your body.,A.expand,B.multiply,C.enlarge,D.extend,10.The Chicago History Museum has one of Americas largest collections of architectural working drawings,as well as manuscript materials,photographs,architectural models,and building,fragments,.,A.components,B.substances,C.monocultures,D.debris,Unit 3:,Vocabulary,10.The Chicago History Museum has one of Americas largest collections of architectural working drawings,as well as manuscript materials,photographs,architectural models,and building,fragments,.,A.components,B.substances,C.monocultures,D.debris,Loss of Biodiversity,Biological diversity is the variety of all life forms the different plants,animals and microorganisms,the genes they,1)_,and the ecosystems to which they belong.,Millions of years of,2)_,from other continents have resulted in Australian plants and animals evolving in ways,3)_,from elsewhere.As a result,about 82%of our mammal species,45%of our land bird species,85%of our flowering plant species,89%of our reptile species,and about 93%of our frog species are found,4)_,in Australia.,claim,contain,extinction,extensive,view,major,store,natural,survive,contribute,dramatic,isolate,important,develop,numerous,different,only,maintain,urban,native,contain,Unit 3:,Cloze,isolation,different,only,Ex.VI,pp.5455,Choose,an appropriate word from the following list to fill in each of the following blanks.Each word can be used only ONCE.Change the word form where necessary.,To be continued.,The,5)_,threat to our biodiversity is the loss of habitat through clearing for agriculture,forestry,mining and,6)_,development.This,combined with the effects of invasive plants and animals,and,7)_,events such as fire,drought and flood,threatens the survival of our,8)_,species.Since European settlement,most of Australias ecosystems have been,9)_,altered.,claim,contain,extinction,extensive,view,major,store,natural,survive,contribute,dramatic,isolate,important,develop,numerous,different,only,maintain,urban,native,major,Unit 3:,Cloze,urban,natural,native,extensively,To be continued.,The result has been,10)_,declines in the distribution and abundance of many species,and the,11)_,of at least 17 native mammal species and ten terrestrial(,陆栖的,)bird species.The effects on aquatic(,水栖的,)habitats have,12)_,to a decline in our native fish populations.,claim,contain,extinction,extensive,view,major,store,natural,survive,contribute,dramatic,isolate,important,develop,numerous,different,only,maintain,urban,native,dramatic,Unit 3:,Cloze,extinction,contributed,To be continued.,The benefits of conserving biodiversity are,13)_,.The worlds species provide us with all our food and many medicines and industrial products.There are also opportunities for,14)_,new or improved food crops from our biological diversity.Biodiversity is also,15)_,for ecological processes such as regulating climate,producing soil,providing protection from erosion,16)_,nutrients and breaking down pollution.,claim,contain,extinction,extensive,view,major,store,natural,survive,contribute,dramatic,isolate,important,develop,numerous,different,only,maintain,urban,native,numerous,Unit 3:,Cloze,developing,important,storing,To be continued.,Biodiversity is c