Unit2Poems李仕才一、浏览理解。TheAmazonbasinregionishometoabout2.5millioninsectspecies，tensofthousandsofplants，andsome2，000birdsandmammals.Todate，atleast40，000plantspecies，3，000fish，1，294birds，427mammals，428amphibians，and378reptileshavebeenscientificallyclassifiedintheregion.OneinfiveofallthebirdsintheworldliveintheAmazonrainforest.Thewarmandwetforesthasbeeninexistenceforatleast55millionyears，andthrivedevenduringglacialperiods，allowingfortheevolutionofanunbelievablediversityofspecies.Radiocarbondating(放射性碳定年法)hasrevealedtreesof10centimeterindiametertobemorethan300yearsold，andsometreesover1，000yearsold，indicatingthatuntouchedforestscanexperienceunbelievablelongevity.ThefirsthumaninhabitantsarethoughttohavesettledintheAmazonregionabout11，200yearsago.Europeanexplorersarrivedinthe16thcentury，bringingdiseaseswhichtraveledfasterthantheexplorersthemselves，killingperhapsasmanyas90%oftheindigenousinhabitants(土著居民)．Bythelate17thcenturytheAmazonbasinwascontrolledbyPortugueseandSpanishexplorers.TheAmazonrainforestshasbeendescribedasthelungsofourplanetbecauseofitsimportantroleinrecyclingcarbondioxideintooxygen.Butduetodeforestation(滥伐森林)，rainforestsnowcoverlessthan5%oftheEarth’slandsurface，andexpertsbelievethatthisisabigcontributortoglobalclimatechange.Severedeforestationbeganinthe20thcentury，with587，000squarekilometerslostuptotheyear2000.Mostdeforestedlandisusedforgrasslandtoraisefarmanimalsandagriculture.Theadditionoftransportrouteshasledtoincreasedsettlementanddeforestation，andatthepresentrate，scientistsestimatethattheAmazonrainforestwillbereducedby40%intwodecades.【解题导语】本文次要讲述了亚马逊热带雨林的历史、丰富的物种和如今所面临的风险。1．WhyarethefiguresmentionedinParagraph1?A．Toprovetheforestuntouched.B．Toclassifyspeciesscientifically.C．Toshowthediversityofspecies.D．ToattractmoreattentiontotheAmazonregion.C解析：推理判断题。根据第一段的内容并结合第二段第一句中的“allowingfortheevolutionofanunbelievablediversityofspecies”可推知，那些关于动植物品种的数字阐明了亚马逊热带雨林的物种多样性，故选C。2．WhydidmostindigenousinhabitantsintheAmazonregiondie?A．Europeanexpl