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1、 Exercises ReadingComprehension StructureoftheText Unit3 Exercises Vocabulary Cloze Translation Unit3 Readingcomprehension 1 Inparagraph1 theauthorsaysthatweareinthemiddleofasixthgreatextinction Whatarethesegreatextinctions Couldyounamesome Inwhatwayisthecurrentgreatextinctiondifferentfromthepreviou
2、sfiveones Thedifferenceliesinthefactthatthepreviousfivegreatextinctionshaveoccurredfornaturalcauses butthecurrentgreatextinctionhasbeencausedbyhumanactivities Reference Ex I p 50 Unit3 Readingcomprehension 2 Whatistheauthortryingtodowithparagraph2 Theauthorgivesussomeexamplestoshowwhathumanneedshave
3、causedthecurrentgreatextinction Generallyspeaking theyarehumans needsforsurvival Reference Unit3 Readingcomprehension 3 WhydidthebuffaloandthepassengerpigeoninNorthAmericabecomeextinct Boththebuffaloandthepassengerpigeonbecameextinctowingtooverhuntingbyhumans Reference Unit3 Readingcomprehension 4 W
4、hatpointdoestheauthorwanttoillustratebywritingabouttheEuropeanrabbitsinparagraph4 Hewantstoillustratethatnaturalhabitatsofsomenativespeciescouldbedestroyedbytheintroductionofforeignspecies TheintroductionofEuropeanrabbitsintoAustraliaisagoodexample Theymultipliedquicklyandthreatenedthehabitatofnativ
5、egrazinganimalsinAustraliabyeatingallthevegetation Reference Unit3 Readingcomprehension 5 Inparagraph5 theauthorstatesthathumansendangerotherspeciesbydestroyingtheirnaturalhabitats Whatexampledoestheauthorgivetosupportthisstatement Theexampleis Therapidshrinkingofrainforestcausedthelossofmanyspecies
6、thatmadetheirhomesinit Reference Unit3 Readingcomprehension 6 Whatcanwelearnfromparagraph8 Eachlifeformoccupiesaspecialplaceintheecosystem andthedisappearanceofanyspecieswillaffectotherspeciesintheecosystem But74speciesaredyingouteveryday Reference Unit3 Readingcomprehension 7 Whatarethetwoadvantage
7、sthatbiodiversityhasovermonoculturesaccordingtoparagraphs9 12 1 Biodiversitymakesitpossibleforusefulsubstancestobefoundinspecieswehaven tgottotestorstudy 2 Biodiversitywillsavehumanityfrombeingstarvedtodeathowingtotheirgreatdependenceonasmallnumberofspecies Reference Unit3 Readingcomprehension 8 Inp
8、aragraph10 theauthorwritesaboutthePacificyewtree WhatmakesthePacificyewtreesohighlyvaluedtoday Whatdoestheauthorwanttotellusbymentioningthistree BecauseitisdiscoveredthatthebarkofthePacificyewtreecontainsasubstancecalledtaxol whichcaneffectivelytreatcertainkindsofcancer Bymentioningthistree theautho
9、rwantstotellusthatmanyspeciesmaydieoutbeforetheirvalueisdiscovered Reference Unit3 Readingcomprehension 9 Whatisthemainideaofparagraph11 Paragraph11mainlytellsusthatthevalueofthevastmajorityofspecieshasyettobediscovered Itisveryimportantforustoprotectthediversityofspecies Ifwedon t wewilllosespecies
10、thatmayturnouttobeextremelyimportanttoourownsurvival Reference Unit3 Readingcomprehension 10 Whatpointissuggestedbythelastparagraph Itsuggeststhatit shardtotellwhethertheseprotectivemethodswillbeeffectiveornotnowbecausetherapidhumanpopulationgrowthmaymakeitdifficulttoputthesemethodsintopractice Refe
11、rence 1 Introduction Paras 1 2 2 Body Paras 3 15 3 Conclusion Para 16 TextOutline Unit3 Structureofthetext Ex II p 51 1 Introduction Paras 1 2 Weareinthemiddleofasixthgreatextinction whichiscausedby TextOutline Unit3 Structureofthetext humanactivities 2 Body Paras 3 15 1 thathumanactivitiesendangero
12、therspecies Paras 3 5 TextOutline Unit3 Structureofthetext Threemajorways 2 Thereasonswhyweshouldpreserveeverylife formonearth Paras 6 13 3 Methodsofprotectingendangeredspecies Paras 14 15 2 Body Paras 3 15 TextOutline Unit3 Structureofthetext A Humanbeings fortheirmeat bones skinsorforprotectingthe
13、ircropsandlivestock B Foreignspeciesintroducedbyhumanbeingscan C Humanbeings bycuttingdownforests buildingtowns etc killoffanimalsdirectly endangerthehabitatofnativespecies destroyanimals naturalhabitats 2 Body Paras 3 15 2 Thereasonswhyweshouldpreserveeverylife formonearth Paras 6 13 TextOutline Un
14、it3 Structureofthetext A B Thevarietyofspeciescanaddnaturalbeauty C Somespeciesprovidehumanswitheconomicvalue D Eachlife form E Biodiversityhasobviousadvantagesover Everylife formhasarighttoexist occupiesaplacewithinitsecosystem monocultures 2 Body Paras 3 15 3 Methodsofprotectingendangeredspecies P
15、aras 14 15 TextOutline Unit3 Structureofthetext A B C Protectinganimalsthroughcaptivebreeding zoos Passinglaws Settingasidenationalparksandpreserves TextOutline Unit3 Structureofthetext 3 Conclusion Para 16 WeIt shardtotelltheeffectivenessoftheseprotectivemethodsnow Thebiggestproblemremains howtomee
16、ttheneedsofagrowinghumanpopulation 1 Thepassengerpigeonwasa exampleofaspeciesthatwasmadeextinctbyoverhunting prime Unit3 Vocabulary PartA Ex V p 53Completethefollowingsentenceswithwordsgivenbelow makingsurethateachwordisusedintherightform 2 Climate soil water andairarenonliving ofanecosystem components Unit3 Vocabulary 3 Asalanguage Englishis fromtheAnglo Saxon aWestGermanicvariety althoughitscurrentvocabularyincludeswordsfrommanylanguages derived Unit3 Vocabulary 4 Stoppingthelossof andlimiting
