2024考研英语一答案
完形填空
There’snothingmorewelcomingthanadooropeningforyou.Withoutthe
needtobetouchedtoopenorclose,automaticdoorsareessential
inimprovingdisabledaccesstobuildingsandhelpingprovide
generalconveniencetocommercialbuildings.
Self-slidingdoorsbegantoemergeasacommercialproductin1960after
beinginventedsixyearspreviouslybyAmericansDeeHortonandLew
Hewitt.Theystartedoutasanoveltyfeature,butastheirusehasgrown
theirbenefitshaveextendedwithinourtechnologicallyadvancedworld.
Particularlyusefulinbusylocationsorduringtimesofemergency,the
doorsactascrowdmanagementbyreducingtheobstaclesputinpeoples’
way.
Aswellasmakingaccessbothinandoutofbuildingseasierforpeople,the
differenceinthewaymanyofthesedoorsopenhelpsreducethetotal
areaoccupiedbythem.Automaticdoorsoftenopentotheside,withthe
panelsslidingacrossoneanother.Replacingswingdoors,
theseallowsmallerbuildingstomaximizetheusablespaceinsidewithout
theneedtoclearthewayforalarge,protrudingdoor.Therearemany
differenttypesofautomaticdoor,witheachrelyingonspecificsignalstotell
themwhentoopen.Althoughthesemethodsdiffer,the
mainprinciplesremainthesame.
Eachautomaticdoorsystemanalysesthelight,sound,weightormovement
intheirvicinityasasignaltoopen.Sensortypesarechosen
tocomplementthedifferentenvironmentstheyareneededin.For
example,abusystreetmightnotsuitamotion-censoreddoor,asitwould
constantlybeopeningforpassers-by.Apressure-sensitivematwouldbe
moreappropriatetolimitthesurveyedarea.
阅读理解A节：
第一篇文章：
21.TheRomansburiedthenailsprobablyforthesakeof________.
D.hidingthemfromthelocals.
原文线索:ThetextsuggeststhattheRomansburiedthenailstopreventthelocal
Caledoniansfromaccessingtheweapon-gradei
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