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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,renewableenergydrivesagrowingmarketforsolarenerg
2、yproducts.Twoofthemaintypesofheatingproductsthattakeadvantageofsolarenergyarepassiveandactivesolarproducts.Thesetwotypesofsolarheatingsystemsdifferinhowtheyareconstructedandcanalsodiffergreatlyincost.Passivesolartechnologycanbeusedtoheatairorwaterdirectlyusingthesun’senergy.Unl
3、ikeanactivesolarapplication,passivesolarsetupsaccomplishtheirtaskwithouttheuseofadditionalelectricalcomponents,suchasfansthatneedanexternalelectricitysupply.Somesolarspaceheatingorwaterheatingsystemsareactivesolarheatingsystemsthathavevariouscomponentsthatrequireexternalpowerso
4、urces.However,theydon’tusethesolarenergydirectlytoheatairorwater.Becauseoftheirsimplicitycomparedwithactivesystems,passivesolarheatingsystemsgenerallyhavethelowercostofthetwo.Inadditiontothesesolarheatingsystems,therearealsosolarpowersystemsavailable.Ratherthanusethesun’senergy
5、forheatingapplications,thesesystemschangesolarenergyintoelectricity.Theseproductsareoftenconstructedfromhundredsofsolarenergycollectioncellscalledphotovoltaiccells,whichgenerateelectricityfromlight.Assunlightfallsonaphotovoltaiccell,thelight’senergyischangedintoelectricitythatc
6、anthenbeusedtopowermanykindsofelectronicdevices.Becauseofthecomplicatedtechnologyinvolved,thesekindsofsolarpowersystemscanbeveryexpensive.However,thecostsavingsmayeventuallymorethanpayoffyourinitialinvestmentinthesolarcells.Whenconsideringwhatkindofsolarheatingorpowersystemtoin
7、stallinyourhomeorbusiness,besurethatyouarepurchasingyourequipmentfromareputablemanufacturerwhowillbeabletohelpyouwithanynecessaryrepairs,andperiodicupgrades.Title:__1____2__clean__3__environmentallyfriendly__4____5__usingthesun’senergydirectly?without__6__?simpleLowercostActive
8、heatingproductsusingthesun’senergyindirectly?withcompo