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1、高考英語(yǔ)素能提高題:Unit2《Theenvironment》(譯林牛津版必修5)Ⅰ.填詞Forthosewhoareconcernedaboutpollution,cleanandrenewableenergysourcesthathelptoprotecttheenvironmentsuchassolarenergyarebecomingpossiblealternativestooilandcoal.Increasingdemandforclean,renewableenergydrivesagrowingmarketforsolarenergyproducts.
2、Twoofthemaintypesofheatingproductsthattakeadvantageofsolarenergyarepassiveandactivesolarproducts.Thesetwotypesofsolarheatingsystemsdifferinhowtheyareconstructedandcanalsodiffergreatlyincost.Passivesolartechnologycanbeusedtoheatairorwaterdirectlyusingthesun’senergy.Unlikeanactivesolarappl
3、ication,passivesolarsetupsaccomplishtheirtaskwithouttheuseofadditionalelectricalcomponents,suchasfansthatneedanexternalelectricitysupply.Somesolarspaceheatingorwaterheatingsystemsareactivesolarheatingsystemsthathavevariouscomponentsthatrequireexternalpowersources.However,theydon’tusethes
4、olarenergydirectlytoheatairorwater.Becauseoftheirsimplicitycomparedwithactivesystems,passivesolarheatingsystemsgenerallyhavethelowercostofthetwo.Inadditiontothesesolarheatingsystems,therearealsosolarpowersystemsavailable.Ratherthanusethesun’senergyforheatingapplications,thesesystemschang
5、esolarenergyintoelectricity.Theseproductsareoftenconstructedfromhundredsofsolarenergycollectioncellscalledphotovoltaiccells,whichgenerateelectricityfromlight.Assunlightfallsonaphotovoltaiccell,thelight’senergyischangedintoelectricitythatcanthenbeusedtopowermanykindsofelectronicdevices.Be
6、causeofthecomplicatedtechnologyinvolved,thesekindsofsolarpowersystemscanbeveryexpensive.However,thecostsavingsmayeventuallymorethanpayoffyourinitialinvestmentinthesolarcells.Whenconsideringwhatkindofsolarheatingorpowersystemtoinstallinyourhomeorbusiness,besurethatyouarepurchasingyourequi
7、pmentfromareputablemanufacturerwhowillbeabletohelpyouwithanynecessaryrepairs,andperiodicupgrades.Title:__1____2__clean__3__environmentallyfriendly__4____5__usingthesun’senergydirectly?without__6__?simpleLowercostActiveheatingproductsusingthesun’senergyindirectly?withcompo