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SECTIONB(10%)Directions:Readthefollowingpassage.Answerthequestionsaccordingtotheinformationgiveninthepassageandtherequiredwordslimit.Writeyouranswersonyouranswersheet.Evenbirdbrainscangettoknowanentirecontine
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SECTIONB(10%)

Directions:Readthefollowingpassage.Answerthequestionsaccordingtotheinformationgiveninthepassageandtherequiredwordslimit.Writeyouranswersonyouranswersheet.

Evenbirdbrainscangettoknowanentirecontinent-----butittakesthemayearofmigrationtodoso,suggestsaPrincetonresearchteam.

Thescientistshaveshownthatmigratingadultsparrowscanfindtheirwaytotheirwinternestinggroundsevenafterbeingthrownoffcoursebythousandsofmiles.

Theteamfirstbrought30sparrowstoPrincetonfromnorthernWashingtonState,wherethebirdshadbeenintheprocessofmigratingsouthwardfromtheirsummerbreedinggroundsinAlaska.Halfthebirdswerejuveniles(少年)ofaboutthreemonthsinagethathadnevermigratedbefore,whiletheotherhalfwereadultsthathadmadetheroundtriptotheirwinteringsiteinthesouth-westernUnitedStatesatleastonce.

Afterthebirdswerereleased,theyattemptedtostarttheirmigrationagainbutbothagegroupgrewdisoriented(迷失方向)quickly.

“Allthebirdsscattered(分散)atfirst,”Wikelskisaid.“Itwasclearthattheywereturnedaroundforacoupleofdays.Butwhiletheadultseventuallyrealizedtheyhadtoheadsouthwest,theyoungerbirdsbeganflyingstraightsouthwardagainasthoughtheywerestillinWashington.”

“Theadults,”saidteammemberRichardHolland,“recoveredtheirbearingsbecausetheypossesssomethingtheyoungerbirdsdonot,whichisaninternalmap.”

“Thesebirdsneedtwothingstoknowwheretheyareandmigrateeffectively:a‘map’anda‘compass’,”saidHolland,apostdoctoralresearchassociateinWikelski’slab.“Whatwe’vefoundisthatjuvenilesusetheircompass,buttheadultsalsousetheirmap.”

Hollandsaid,“Thebirdsdonotlosethecompassastheyage,butsomehowdevelopthemap,eventuallyapplyingbothtoolstokeepontrackduringmigratoryflights.Scientistsalreadyhavedeterminedthatthecompassisbasedonthesunorthemagneticfield,butwherethemapcomesfromremainsamystery----onethattheteamwillbeexploringinthecomingyears.”

81.Wheredoyouthinkthe30sparrowsspenttheirsummer?(Nomorethan2words)

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陆新刚回答:
  _______________________________________________________________________________81.InAlaska.82.Aninternalmap.83.Whata“map”isbasedon.84.Sparrowsneedbotha“map”anda“compass”...
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