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1、SECTION240QuestionsReadeachpassagecarefullyandthenanswerthequestionsaboutit.Foreachquestion,decideonthebasisofthepassagewhichoneofthechoicesbestanswersthequestion.Intheearly19thcentury,scientists’understandingofthelawsofgravitypredictedcertainorbitsforeachoftheplanets.Ingeneral,thesevenp
2、lanetsknownatthattimeobservedthesepredictedorbits.However,therewasanexception:Uranus,atthefarouterreachesofthesolarsystem,refusedtobehaveaspredicted.ThestrangeorbitofUranusposedaproblemforLine5scientists.Somethoughtthattheeffectofthesun’sgravitychangedatsuchextremedistances.Otherswerecon
3、vincedthattherehadbeensomeerror:Uranuswasactuallybehavingasexpected,andastronomersmusthavebotchedtheirobservations.Buttherewasathirdtheory:thatsomeas-yet-undiscoveredobjectintheoutersolarsystemwasdisturbingtheorbitofUranus.Convincedofthistheory,atleasttwoscientists—JohnAdamsCouchand10Urb
4、ainJean-JosephLeVerrier—workedseparatelytocalculatethepositionofsuchanobject.By1846,theyhadcalculatedthemass,orbit,andpositionoftheobject,usingonlytheirknowledgeofgravityandobservationsoftheUranus’sorbit.Withtheircalculations,astronomerswereabletolocatetheobject,andin1846,theplanetNeptun
5、ewasdiscovered.1.WhydidtheorbitofUranusposea2.Theauthor’smainpurposeinthispassageproblemforearly19thcenturyscientists?isto(A)Uranus’sorbitdifferedfromthe(A)illustratethelawsofgravitationpredictionsmadebyscientific(B)specifytheorbitsoftheplanetsinourmodels.solarsystem(B)Uranus’sorbitwould
6、makespace(C)describeUranus'ssizeandtravelsignificantlymoredifficultincompositionthefuture.(D)explainhowUranus’sorbitledto(C)ScientistswereunabletomakeNeptune’sdiscoveryaccurateobservationsofUranus’s(E)arguethatmathisafundamentaltoolorbit.inscience(D)Uranuswasoftenblockingscientists’viewo
7、fotherplanetsintheoutersolarsystem.(E)ScientistswereconcernedthatUranusmightbreakfreeofitsorbit,posingathreattoEarth.GOONTOTHENEXTPAGE.IvyGlobalSSATMIDDLELEVELTEST1
8、133.Accordingtothepassage,JohnAdams5.AfterthediscoveryofNeptune,scientistsCouchandUrbainJean-JosephLeVerrie
