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  Wearenowlivinginthemodernsociety.Mostoftheenergyweuseforheatinglightingtransportationandmanufacturing(制造业)comesfromfossil(化石)fuels.Thesearecarbon-basedfuelsfromoilcoalandnaturalgas.Whenw

  Wearenowlivinginthemodernsociety.Mostoftheenergyweuseforheatinglightingtransportationandmanufacturing(制造业)comesfromfossil(化石)fuels.Thesearecarbon-basedfuelsfromoilcoalandnaturalgas.Whenweburnthesefuelswereleaseheatwhichp__小题1:___theenergy.

  Therearethreemaindisadvantagestousingthesefuels.FirstlytheyarecausingclimateproblemsbecauseoftheG_小题2:___Effect.Whenweburnfossilfuelstheyproducecarbondioxidewhichcausesglobalwarming.Secondlywhenwehaveusedupallourcoaloilandnaturalgaswewillhaven__小题3:__lefttoburn.Thirdlytheyarenotveryefficient.Theinternalcombustionengine(内燃机)thatweuseinmostcarstrucksandbusesforexampleisonlyabout14%efficient.

  Scientistsareworkingonanotherfuel—hydrogen.Thereareacoupleofadvantagestousinghydrogenasafuel.Firstlybecausetwo-thirdsofthee__小题4:__surfaceiswaterandwaterismadeofhydrogenandoxygen.Thereisanalmostunlimitedsupplyofhydrogen.Secondlyburninghydrogendoesnotcauseglobalwarming.Thirdlyitismuchmoreefficientthancarbon-basedfuels.

  Unfortunatelythereareproblemswithhydrogenatthepresenttime:thereistheproblemofseparating(分离)itfromwaterc_小题5:___andthereisthedifficultyofstoringit.Itcanbestoredunderpressurebuthighpressuretanksarefarfromsafe.Itcanalsobestoredasaliquidbutonlyatextremelylowtemperatures.Itseemslikelythereforethattherewillhavetobeacompletelynewtechnologybeforehydrogenreplacesfossilfuels.S__小题6:___theseproblemsisanurgent(急迫的)matter.AlthoughChinaIndiaandAustraliahavehugeamountsofcheapcoalandtherearestilll__小题7:___oilandgasreserves(储藏量)elsewheretheeffectsontheplanet’sclimatewillbebadiftheyareused.

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2020-05-1607:06
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林伟强

  小题1:provides小题2:greenhouse小题3:nothing小题4:earth's小题5:cheaply小题6:Solving小题7:large分析:本文讲述了我们的矿产资源。我们的矿产资源都是有限的,不可再生的。现在的石油,天然气,因为燃烧...

2020-05-16 07:10:30
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