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1、Level:NDRA:34Genre:InformationalStrategy:VisualizeSkill:CompareandContrastWordCount:6293.5.22HOUGHTONMIFFLINOnlineLeveledBooksISBN-13:978-0-547-02104-1ISBN-10:0-547-02104-61031979HOUGHTONMIFFLINbyCalebGrahamILLUSTRATIONCREDIT:PattiIsaacsPHOTOGRAPHYCREDITS:Cover?RonSanford/CORBIS.1GayBumgarner/A
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3、edePreis.1011?RonSanford/CORBIS.12?Shutterstock.13GayBumgarner/Alamy.14(t)?HalHorwitz/CORBIS.(tc)?Creatas.(bc)FSAgency/Alamy.(b)?RonSanford/CORBIS.Copyright?byHoughtonMif?inCompany.Allrightsreserved.Nopartofthisworkmaybereproducedortransmittedinanyformorbyanymeans,electronicormechanical,includi
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6、1211100908TableofContentsTwo-WayTravelers4PartsofaMonarch’sLife6TheJourneySouth8LifeinWinter10TheJourneyBackNorth1Monarchbutterfliesareamazingtravelers.It’sawarmsummerday.Youwatchtheflowerswavegentlyinthebreeze.Suddenly,aflashoforangeandblackflutterspast.It’samonarchbutterfly!Monarchbutterfli
7、esarebeautifulinsects.Butdidyouknowthattheyarealsosomeofthemostamazingtravelersintheworld?Two-WayTravelersWhatmakesmonarchbutterfliessuchspecialtravelers?Theyaretheonlybutterfliesthatmigrate.Eachfall,millionsofmonarchsflymorethan
