预览加载中,请您耐心等待几秒...
1/7
2/7
3/7
4/7
5/7
6/7
7/7

在线预览结束,喜欢就下载吧,查找使用更方便

如果您无法下载资料,请参考说明:

1、部分资料下载需要金币,请确保您的账户上有足够的金币

2、已购买过的文档,再次下载不重复扣费

3、资料包下载后请先用软件解压,在使用对应软件打开

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