新视角研究生英语读说写2三单元课后练习答案.ppt

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1、ExercisesReadingComprehensionStructureoftheTextUnit3:ExercisesVocabularyClozeTranslationUnit3:Readingcomprehension1.Inparagraph1,theauthorsaysthatweareinthemiddleofasixthgreatextinction.Whatarethesegreatextinctions?Couldyounamesome.Inwhatwayisthecurrentgreatextinctiondifferentfromthepr

2、eviousfiveones?Thedifferenceliesinthefactthatthepreviousfivegreatextinctionshaveoccurredfornaturalcauses,butthecurrentgreatextinctionhasbeencausedbyhumanactivities.ReferenceEx.I,p.50Unit3:Readingcomprehension2.Whatistheauthortryingtodowithparagraph2?Theauthorgivesussomeexamplestoshowwh

3、athumanneedshavecausedthecurrentgreatextinction.Generallyspeaking,theyarehumans’needsforsurvival.ReferenceUnit3:Readingcomprehension3.WhydidthebuffaloandthepassengerpigeoninNorthAmericabecomeextinct?Boththebuffaloandthepassengerpigeonbecameextinctowingtooverhuntingbyhumans.ReferenceUni

4、t3:Readingcomprehension4.WhatpointdoestheauthorwanttoillustratebywritingabouttheEuropeanrabbitsinparagraph4?Hewantstoillustratethatnaturalhabitatsofsomenativespeciescouldbedestroyedbytheintroductionofforeignspecies.TheintroductionofEuropeanrabbitsintoAustraliaisagoodexample.Theymultipl

5、iedquicklyandthreatenedthehabitatofnativegrazinganimalsinAustraliabyeatingallthevegetation.ReferenceUnit3:Readingcomprehension5.Inparagraph5,theauthorstatesthathumansendangerotherspeciesbydestroyingtheirnaturalhabitats.Whatexampledoestheauthorgivetosupportthisstatement?Theexampleis:The

6、rapidshrinkingofrainforestcausedthelossofmanyspeciesthatmadetheirhomesinit.ReferenceUnit3:Readingcomprehension6.Whatcanwelearnfromparagraph8?Eachlifeformoccupiesaspecialplaceintheecosystem,andthedisappearanceofanyspecieswillaffectotherspeciesintheecosystem.But74speciesaredyingouteveryd

7、ay.ReferenceUnit3:Readingcomprehension7.Whatarethetwoadvantagesthatbiodiversityhasovermonoculturesaccordingtoparagraphs9–12?1)Biodiversitymakesitpossibleforusefulsubstancestobefoundinspecieswehaven’tgottotestorstudy.2)Biodiversitywillsavehumanityfrombeingstarvedtodeathowingtotheirgre