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2019版高考英语Unit6Design夯练含解析北师大版必修2.doc

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7Unit6Design李仕才一、阅读理解。TheAmazonbasinregionishometoabout2.5millioninsectspeciestensofthousandsofplantsandsome2000birdsandmammals.Todateatleast40000plantspecies3000fish1294birds427mammals428amphibiansand378reptileshavebeenscientificallyclassifiedintheregion.OneinfiveofallthebirdsintheworldliveintherainforestsoftheAmazon.Thewarmwetforestshavebeeninexistencefor55millionyearsandthrivedevenduringglacialperiodsallowingfortheevolutionofanunbelievablediversityofspecies.Radiocarbondating(放射性碳年代测定)hasrevealedtreesof10centimeterdiametertobemorethan300yearsoldandsometreesover1000yearsoldindicatingthatuntouchedforestscanexperienceunbelievablelongevity.ThefirsthumaninhabitantsarethoughttohavesettledintheAmazonregionabout11200yearsago.Europeanexplorersarrivedinthe16thcenturybringingdiseaseswhichtraveledfasterthantheexplorersthemselveskillingperhapsasmanyas90%oftheindigenousinhabitants(土著居民)．Bythelate17thcenturytheAmazonbasinwascontrolledbyPortugueseandSpanishexplorers.TheAmazonrainforesthasbeendescribedasthelungsofourplanetbecauseofitsimportantroleinrecyclingcarbondioxideintooxygen.Butduetodeforestation(采伐森林)rainforestsnowcoverlessthan5%oftheEarth'slandsurfaceandexpertsbelievethatthisisabigcontributortoglobalclimatechange.Severedeforestationbeganinthe20thcenturywith587000squarekilometerslostuptotheyear2000.Mostdeforestedlandisusedforgrasslandtoraisefarmanimalsandagriculture.TheadditionoftransportrouteshasledtoincreasedsettlementanddeforestationandatthepresentratescientistsestimatethattheAmazonrainforestwillbereducedby40%intwodecades.1．WhyarethefiguresmentionedinParagraph1?A．Toprovetheforestuntouched.B．Toclassifyspeciesscientifically.C．Toshowthediversityofspecies.D．ToattractmoreattentiontoAmazo