阅读单选高三英语试卷
日期：2010-07-14 07:32
theysettlethemselvesinoneofaboutfifteenplacesinamountainforestfilledwithfirtreesEachplaceprovidesawinterhomeformillionsofmonarchsThebutterfliesaresomanythattheyoftencoverentiretreesWhenspringcomes，thenflyacrosstheGulfofMexicointoTexasOnceinMexico，(第14周)阅读练习AMonarchbutterflies（黑脉金斑蝶）areacommonsummersightinthenorthernUnitedStatesandCanadaTheselargeorangeandblackinsects（昆虫）brightenparksandgardensastheyflylightlyamongtheflowersWhatmakesmonarchsparticularlyinterestingisthattheymigrate（迁飞）—allthewaytoCaliforniaorMexicoandbackTheyarethoughttobetheonlyinsectthatdoesthisEveryyearinthelatesummermonarchsbegintheirjourneytothesouthThoseheadingforMexicogofirstfortheLouisiana-Mississippiarea，theybegintheirlongjourneynorthThequestionisoftenaskedwhethereverybutterflymakestheround-tripjourneyeveryyearAndtheanswerisnoTheaveragemonarchlivesaboutninemonthsSooneflyingnorthmightlayeggsinLouisianaandthendieTheeggsofthatgenerationmaybefoundinKentucky;theeggsofthenextgenerationmayendupinWi，
查看全部