Withtheworld'spopulationestimatedtogrowfromsixtoninebillionby2050,researchers.businessesandgovernmentsarealreadydealingwiththeimpactthisincreasewillhaveoneverythingfromfoodandwatertoinfrastructure(基础设施)andjobs.Underlingallthis__1__willbethedemandforenergy,whichisexpectedtodoubleoverthenext40years.
Findingtheresourcestomeetthisdemandina__2__.sustainablewayisthecornerstone(基石)ofournation'senergysecurity,andwillbeoneofthemajor__3__ofthe21stcentury.Alternativeformsofenergy-bio-fuels,windandsolar,tonameafeware__4__beingfundedanddeveloped,andwillplayagrowing__5__intheworld'senergysupply.Butexpertssaythatevenwhen__6__,alternativeenergysourceswilllikelymeetonlyabout30%oftheworld'senergyneedsby2050.
Forexample,evenwith__7__investments,suchasthe$93millionforwindenergydevelopment__8__intheAmericanRecoveryandReinvestmentAct,importantalternativeenergysourcessuchaswindandbio-fuels__9__onlyabout1%ofthemarkettoday.
Energyandsustainabilityexpertssaytheanswertoourfutureenergyneedswilllikelycomefromalotof__10__bothtraditionalandalternative.
答案解析:
1growth2stable3challenges4certainly5role6combined7significant8included9comprise10solutions
【解析】这是一篇讨论能源资源的说明文,话题是考生比较熟悉的能源问题,不断增长的人口与可再生资源的矛盾该如何解决。文中指出能源的一些可替代形式如生物能源、风能太阳能等可再生资源将在未来发挥越来越重要的作用。但是专家指出,即使这些资源储备量惊人,但是到2050年也只能满足世界30%的需求。文章最后两段探讨了各能源在市场上的需求,以及解决未来能源需求的其他方案。
总体来说,这篇文章理解难度不大,填空难度适中,所选词汇也都是四级考纲的词汇。选项较具有干扰项,多为c和s开头的单词,考生在考试时要特别注意。