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ID:21195681
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时间:2018-10-20
《a dam is a man-made structure built across a river. most dams 阅读理解答案》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、Adamisaman-madestructurebuiltacrossariver.Mostdams阅读理解答案 Adamisaman-madestructurebuiltacrossariver.Mostdamsarebuilttocontrolariver’swaterflow,improvenavigationandcontrolflooding.However,somedamsarebuilttoproducehydro-electricpower. Hydro-electricpowerisproducedaswaterpassesthroughadam,an
2、dintoariverbelow.Themorewaterthatpassesthroughadam,themoreenergyisproduced.Onceadamisbuilt,aman-madelakeiscreatedbehindthedam. Electricityisproducedbyakindofequipmentcalledaturbine(水轮机).Turbinescontainmetalcoils(线圈)surroundedbymagnets(磁铁).Whenthemagnetsmoveroundrapidlyoverthemetalcoils,el
3、ectricityisproduced.Turbinesarelocatedinsidedams.Thefallingwatermakesthemagnetsgoaroundthecoils. Damsprovidecleanenergy,buttheycanalsoharmtheenvironment.Speciesthatuseriverstoreproduceareoftenhurtbydams.IntheNorthwestoftheUS,thepopulationoffisheshasdroppedfrom16milliontomillionsincehydro-
4、electricplantswerebuiltontheColumbiaRiver.Damsallovertheworldhavehurtsomespecies. ThehighestdamintheUnitesStatesislocatednearOroville,California.TheOrovilleDamtowers230metersandismorethanamilewide.Thisdamwasbuiltin1968,22yearsaftertheHooverDam.TheHooverDam,ontheNevada-Arizonabordercontrol
5、stheColoradoriver.Itis221metershighandhasmillionhectare-metersofwater. ThehighestdamintheworldistheNurekDamontheVakhshRiverinTadzikistan,acountryincentralAsia.Thisdamis300meterstall. 4.WhichofthefollowingstatementsisNOTtrueaccordingtothepassage? A.Somedamsarebuiltforcontrollingariver’sw
6、aterflow. B.Hydro-electricpowerisusuallyproducedthroughadam. C.Damscanofferenergyandtheyareharmlesstotheenvironment. D.Generallyspeaking,wherethereisadam,thereisaman-madelake. 5.Thethirdparagraphmainlytellsus_____. A.howhydro-electricpowerisproducedB.Whataturbineisandhowitworks C.how
7、themagnetsandthemetalcoilswork D.howthefallingwaterpassesthroughaturbine damwhichcontrolstheColoradoriveris____. A.theOrovilleDamB.theHooverDamC.theNurekDamD.theVakhshDam CAB
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