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1、阅读理解训练（7）阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。AccordingtotheUSgovernment,windfarmsoffthePacificcoastcouldproduce900gigawattsofelectricityeveryyear.Unfortunately,thewaterthereisfartoodeepforeventhetallestwindmills(seepicture)totouchbottom.AnexperimentunderwayoffthecoastofNorway,however,coul
2、dhelpputthemanywhere.Theproject,calledHywind,istheworld’sfirstlarge-scaledeepwaterwindturbine(涡轮发电机).Althoughitusesafairlystandard152-ton,2.3-megawattturbine,Hywindrepresentstotallynewtechnology.Theturbinewillbefixed213feetabovethewateronafloatingspar(seepicture),atechnologyHywind’screator
3、,theNorwegiancompanyStatoilHydro,hasdevelopedrecently.Thesteelspar,whichisfilledwithstonesandgoes328feetbelowtheseasurface,willbetiedtotheoceanfloorbythreecables(缆索);thesewillkeepthesparstableandpreventtheturbinefrommovingupanddowninthewaves.Hywind’sstability(稳定性)inthecoldandroughseawouldp
4、rovethateventhedeepestcornersoftheoceanaresuitableforwindpower.Ifallgoesaccordingtoplan,theturbinewillstartproducingelectricitysixmilesoffthecoastofsouthwesternNorwayasearlyasSeptember.Toproduceelectricityonalargescale,acommercialwindfarmwillhavetousebiggerturbinesthanHywinddoes,butit’sdif
5、ficultenoughtobalancesuchalargeturbinesohighonafloatingsparinthemiddleoftheocean.Tomakethatturbineheavier,thewholespar’scentreofgravitymustbemovedmuchclosertotheocean’ssurface.Todothat,thecompanyplanstodesignanewkindofwindturbine,onewhosegearbox(变速箱)sitsatsealevelratherthanbehindtheblades(
6、seepicture).Hywindisatestrun,butthebenefitsforperfectingfloatingwind-farmtechnologycouldbeextremelylarge.Outatsea,thewindisoftenstrongerandsteadierthanclosetoshore,whereallexistingoffshorewindmillsareplanted.Deep-seafarmsareinvisiblefromland,whichhelpsovercomethewindmill-as-eyesoreobjectio
7、n.Ifthetechnologycatcheson,itwillopenupvastareasoftheplanet’ssurfacetooneofthebestlow-carbonpowersourcesavailable.1.TheHywindprojectusestotallynewtechnologytoensurethestabilityof . A.thecableswhichtiethespartotheoceanfloorB.thesparwhichisfloatingindeep-seawa
