鸟的地图与指南针

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1、鸟的地图与指南针　　Directions：Readthefollowingpassage.Answerthequestionsaccordingtotheinformationgiveninthepassageandtherequiredwordslimit.　　Evenbirdbrainscangettoknowanentirecontinent―butittakesthemayearofmigrationtodoso，suggestsaPrincetonresearchteam.　　Thescientistshaves

2、hownthatmigratingadultsparrowscanfindtheirwaytotheirwinternestinggroundsevenafterbeingthrownoffcoursebythousandsofmiles.　　Theteamfirstbrought30sparrowstoPrincetonfromnorthernWashingtonState，wherethebirdshadbeenintheprocessofmigratingsouthwardfromtheirsummerbreedin

3、ggroundsinAlaska.Halfthebirdswerejuveniles（少年）ofaboutthreemonthsinagethathadnevermigratedbefore，whiletheotherhalfwereadultsthathadmadetheroundtriptotheirwinteringsiteinthesouth-westernUnitedStatesatleastonce.　　Afterthebirdswerereleased，theyattemptedtostarttheirmig

4、rationagainbutbothagegroupgrewdisoriented（迷失方向）quickly.3　　“Allthebirdsscattered（分散）atfirst，”Wikelskisaid.“Itwasclearthattheywereturnedaroundforacoupleofdays.Butwhiletheadultseventuallyrealizedtheyhadtoheadsouthwest，theyoungerbirdsbeganflyingstraightsouthwardagaina

5、sthoughtheywerestillinWashington.”　　“Theadults，”saidteammemberRichardHolland，“recoveredtheirbearingsbecausetheypossesssomethingtheyoungerbirdsdonot，whichisaninternalmap.”　　“Thesebirdsneedtwothingstoknowwheretheyareandmigrateeffectively：a‘map’anda‘compass’，”saidHol

6、land，apostdoctoralresearchassociateinWikelski’slab.“Whatwe’vefoundisthatjuvenilesusetheircompass，buttheadultsalsousetheirmap.”　　Hollandsaid，“Thebirdsdonotlosethecompassastheyage，butsomehowdevelopthemap，eventuallyapplyingbothtoolstokeepontrackduringmigratoryflights

7、.Scientistsalreadyhavedeterminedthatthecompassisbasedonthesunorthemagneticfield，butwherethemapcomesfromremainsamystery―onethattheteamwillbeexploringinthecomingyears.”　　1.Wheredoyouthinkthe30sparrowsspenttheirsummer？（Nomorethan2words）　　2.Whatarethejuvenilesparrowsr

8、eallylackof？（Nomorethan33words）　　3.Whatarescientistsstillnotsureabout？（Nomorethan6words）　　4.Whatisthemainideaofthepassage？（Nomorethan12words）　　参考答案　　1.I