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Unit4Scientistswhochangedtheworld
Ⅰ.阅读理解
A
[2024·贵阳四校高三联考二]NASAastronautBruceMcCandlessⅡhasdied.Youmay
notknowhisname,butyouveprobablyseenhiminoneofthemostfamouspictures
evertakeninspace.In1984,McCandlesscarriedajetpoweredbackpackandflew
awayfromtheshuttle,byhimself,untethered(不被绳索捆束的),withtheEarthas
abackground.Itwasthefirsttimethatanastronauthadeverfloatedfreelyin
space,andMcCandlesshelpeddevelopthetechnology.
BruceMcCandlesshadbeenanastronautforalongtimebeforehefirstflew
inspaceaboardtheshuttle.Hewasoneoftheoneswhocommunicatedwiththecrew
ofApollo11.Whilehewaswaitinghisturntoflyinspace,hehelpeddesignwhat
becametobeknownastheMannedManeuveringUnit—abackpackpropulsiondevice
thatgaveastronautsmobilityforextravehicular(舱外的)activitiesoutsidethe
shuttle.McCandlessfirstwenttospacein1984aboardtheshuttleChallengerand
tookthesejetpoweredbackpacksalong.Duringthemission,McCandlessclimbedinto
the300poundcontraption(奇妙的装置)andslowlyeasedoutoftheshuttlescargo
bayascontrollerslookedon.
ItwasfrighteningseeingMcCandlessoutinspacebyhimself.Relativeto
theEarth,hewasflyingatalmost18,000milesperhour.Butrelativetotheshuttle,
hewasmovingatonefootpersecond.Hesaidhewasntnervous.Hefounditeasy.
Hehadtrainedforthatmomentforyears,readyforanything.
Bytheendofthatspacewalk,hehadmovedlittlemorethan300feetaway
fromtheshuttlewhenthefamouspicturewastaken.
McCandlesssaidhewasmostproudthatchildrencameuptohimlaterin
lifetosaytheydseenthepicture.Hehopeditwouldinspirethenextgeneration
ofexplorers.
BruceMcCandlessshowedtheway.Hefinishedsecondinhisclassof899
attheU.S
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