英语六级CET阅读匹配及详解2017年英语六级CET阅读匹配及详解"Timeisanever-endingtrain,weareallpeoplecoachman."以下是小编为大家搜索整理的2017年英语六级CET阅读匹配及详解，希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!RenewableEnergyInthepastcentury,ithasbeenseenthattheconsumptionofnon-renewablesourcesofenergyhascausedmoreenvironmentaldamagethananyotherhumanactivity.Electricitygeneratedfromfossilfuelssuchascoalandcrudeoilhasledtohighconcentrationsofharmfulgasesintheatmosphere.Thishasinturnledtomanyproblemsbeingfacedtodaysuchasozonedepletionandglobalwarming.Vehicularpollutionhasalsobeenamajorproblem.Therefore,alternativesourcesofenergyhavebecomeveryimportantandrelevanttotoday'sworld.Thesesources,suchasthesunandwind,canneverbeexhaustedandthereforearccalledrenewable.Theycauselessemissionandareavailablelocally.Theirusecan.toalargeextent,reducechemical,radioactive,andthermalpollution.Theystandoutasaviablesourceofcleanandlimitlessenergy.Thesearealsoknownasnon-conventionalsourcesofenergy.Mostoftherenewablesourcesofenergyarefairfynon-pollutingandconsideredcleanthoughbiomass,arenewablesource,isamajorpolluterindoors.SolarEnergySolarenergyisthemostreadilyavailablesourceofenergy.Itdoesnotbelongtoanybodyandis,therefore,free.Itisalsothemostimportantofthenon-conventionalsourcesofenergybecauseitisnon-pollutingand,therefore.helpsinlesseningthegreenhouseeffect.Solarenergyhasbeenusedsinceprehistorictimes.butinamostprimitivemanner.Before1970,someresearchanddevelopmentwascarriedoutinafewcountriestoexploitsolarenergymoreefficiently,butmostofthisworkremainedmainlyacademic.Afterthedramaticriseinoilpricesinthe1970s,severalcountriesbegantoformulateextensiveresearchanddevelopmentprogrammestoexploitsolarenergy.Whenwehangoutourclothestodryinthesun,weusetheenergyofthesun.Inthesameway,solarpanelsabsorbtheenergyofthesuntoprovideheatforcookingandforheatingwater.Suchsystemsareavailableinthemarketandarebeingusedinhomesandfactories.Solarenergycanalsobeursedtomeetourelectricityrequirements.ThroughSolarPhotovoltaic(SPV)cells,solarradiationgetsconvertedint