EricaDavidlivesinPinedale,Wyom-查字典问答网
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  EricaDavidlivesinPinedale,Wyoming,USA,wherewintercanbringtemperaturesofbelow35degreesFahrenheit,howlingwinds,andalotofsnow.Soitwasjustnaturalthatshechosetostudysnowforherschoolsciencefairinthesixthgrade

  EricaDavidlivesinPinedale,Wyoming,USA,wherewintercanbringtemperaturesofbelow35degreesFahrenheit,howlingwinds,andalotofsnow.Soitwasjustnaturalthatshechosetostudysnowforherschoolsciencefairinthesixthgrade.

  Nowajuniorinhighschool,Ericaisinhersixthyearofsnowexperiments,andiswellonherwaytobecomingasnowexpert.Shestartedwithabasicquestion:Couldsnowfencesbebuilttoworkbetter?

  Snowfencesareusedtokeepsnowdrifts(雪堆)fromcoveringareaslikeroadsoftraintracks,ortohelpbuildupsnowwhereitcanhelpwithwatershortagesinspringwhenitmelts(融化)."Also,Iwantedtoprotectmyanimalsbetterfromblowingsnow,"saysErica,whoraisesgoats,sheep,andpigs.

  Beforeshecouldtestfencedesigns,Ericahadtofigureoutwhatwouldactlikerealsnowinherexperiments."Itestedflour,sugar,andsaltbeforeIsettledondishwasherpowder,"sheexplains.

  Sciencefairsofferstudentsthechancetotesttheories,presentfindingstojudges,andmeetotherresearchers.Erica'smanyachievementsincludecompetingattheDiscoveryChannelYoungScientistChallengeformiddleschoolstudentsandtheIntelInternationalScienceandEngineeringFair,wherestudentsfromaroundtheworldpresenttheirscienceresearch.

  Butperhapsthebestrewardisthatherresearchisalreadybeingputtogooduse.Shehascomeupwithanimprovedsnowfencedesign,andthisyearshe'shelpingthinkouthowtoprovidewatersupplytonativeplants,whichhavebeenkilledoffbydrillingatnearbynaturalgasfields.

  "Sciencefairsareanamazingexperience,"saysErica."Justpickyourtruefeelingandgoforit."

  72.Whatdoesthepassagesuggesttous?___

  A.SciencefairsareheldforhighschoolstudentsinAmerica.

  B.EricaistheyoungestshowexpertwellknowninAmerica.

  C.TheenvironmentbroughtmuchconvenienceforEricatostudysnow.

  D.ThehopetocontributetoherhometownmadeEricaexperimentonsnow.

  73.InErica'shometown,snowfencesmayplayapartin___.

  a.reducingtheharmblowingsnowdoestoanimals

  b.supplyingwaterresourcetothenearbygasfields

  c.makingu

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2020-04-29 00:08
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  72.C 73.D 74.B 75.D72.C根据文章第一段EricaDavidlivesinPinedale,Wyoming,USA,wherewintercanbringtemperaturesofbelow35degreesFahrenheit,howlingwinds,...

2020-04-29 00:10:36

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