MonarchButterflies:BeautifulbutPoisonousIfyou’veeverseenamonarchbutterfly,thenyou’veprobablynoticedtheirbrightorangeandblackcolours.Itmakesthemeasytoseeinthesky.YoumaythinkthiswouldputtheMonarchinharmfrompredators,butthesebrightcoloursareactuallywhatprotectthebutterflyMonarchseataplantcalledmilkweed（馬利筋屬植物）,whichiswhytheyaresometimescalled“milkweedbutterflies”.MilkweedcontainstoxinsthatarenotpoisonoustoMonarchsbutarepoisonoustootherlivingthings.Thesetoxinsthatarearegularpartofthemonarchbutterfly’sdietmakethempoisonoustopredators.abirdflyingthroughtheskywillleavetheflashy（顯眼的）colouredMonarchalonebecauseitknowsthosebrightcoloursmeantheMonarchispoisonous.Monarchbutterfliesactuallybegineatingmilkweed（馬利筋）aslarvae.Asyouprobablyknow,butterfliesbeginascaterpillars.Monarchbutterflieslayeggsonmilkweedplants,andwhenanegghatches,theyoungcaterpillar,orlarva,beginstoeatthemilkweed.Thecaterpillarwilleattheplantforabouttwoweeksandgrowtoapproximatelytwoincheslong.Thecaterpillarwillthenspinasilkpadandattachitselfupside-downtoatwigorleaf.Nextitshedsitsyellow,black,andwhitestriped(有條紋的)skin.Thisisthefirststepinthecaterpillar’stransformationtoabutterfly.Underneaththeoldskinofthecaterpillarisahardlayerofskincalledchrysalis(蛹).Thecaterpillarwillkeepthischrysalis,orpupa(蛹),arounditsbodyandstayinsideitfortwoweekswhileitchangesintoaMonarchbutterfly.Thechrysaliswillbecometransparentwhenthebutterflyisreadytoemerge.TheMonarchusesthebloodinitsbodytoinflateitswings.Thenitwillhanginthatsamespotforhoursuntilitswingsdryanditcanfly.Monarchbutterfliescanliveforverydifferentlengthsoftimedependingonwhattimeofyeartheyemergefromtheirchrysalisandbecomeadultbutterflies.IfaMonarchreachesadulthoodinearlysummer,itwillmostlikelyliveforonlytwotofiveweeks.ButiftheMonarchbecomesanadultattheendofthesummermonths,itwillmigratesouthandliveforabouteighttoninemonths.Monarchscanbefoundallovertheworldintropicandsub-tropicareas.Andifyou’dliketoobservetheminyourownyard,plantmilkweedandwaitforthemonarchstocomeforafeast.

ReadingComprehensionChoosethecorrectanswerforeachquestion1.WhydobirdsleavetheMonarchbutterfliesalone?A.BecausethebirdsdontlikethetasteofthemB.BecausethebirdsknowthemonarchispoisonousC.BecausetheircoloursarenotflashyenoughD.Becausethebirdsdon’tlikebrightcolours2.Whatisabutterflylarvacalled?A.AcaterpillarB.AchrysalisC.ApupaD.Amonarch3.HowlongdoesaMonarch’slarvalstageusuallylast?A.AboutfivedaysB.AbouttwoweeksC.AboutfiveweeksD.Aboutninemonths4.Whichisthebestdefinitionfortheunderlinedword“transformation”inParagraph3?A.Growingolder.B.SleepC.MovementD.Change5.WhichwouldbethebestwaytoattractMonarchbutterfliestoyouryard?A.RaisingabirdinyouryardB.RaisingotherspeciesofbutterfliesinyouryardC.PlantingmilkweedinyouryardD.PlantingdifferentkindsofflowersinyouryardVocabulary基礎(chǔ)詞butterfly n.蝴蝶記 聯(lián)想記憶：butter（黃油）+fly（飛）→顏色像黃油且會飛的東西→蝴蝶 搭havebutterflies（inyourstomach）（做某事前）心慌,緊張hatch v.孵化,孵出；策劃,（尤指）密謀 英（ofayoungbird,fish,insect,etc.）tocomeoutofanegg 記聯(lián)想記憶：贏得比賽（match）要有準(zhǔn)備和策劃（hatch） 搭hatchout（小雞等）孵出spin v.[spun-spun]吐絲結(jié)網(wǎng)；（使）快速旋轉(zhuǎn)；（使）急轉(zhuǎn)身；紡紗n.（高速旋轉(zhuǎn)） 例Thespiderisspinningaweb.這只蜘蛛正在結(jié)網(wǎng)。underneath prep.在…下面 英underorbelow 記組合詞：under（在…下）+neath（在…下）→在…下面 例Thepenrolledunderneaththedesk.鋼筆滾到了桌子下面。hang v.懸掛；絞死,吊死 例Pleasehangyourhatuponthehook.請把你的帽子掛在衣鉤上。length n.長度,長 記詞根記憶：leng（=long,長）+th長度 搭thelengthof……的長度atlength最后；詳細(xì)地feast n.盛宴；節(jié)日記 聯(lián)想記憶：f（看作fly,飛）+east（東方）→東方騰飛的那一天→節(jié)日銷 搭giveafeast舉行宴會Vocabulary進(jìn)階詞monarch n.君主,帝王 記詞根記憶：mon（一個）+arch（統(tǒng)治）個人統(tǒng)治→君主 搭monarchbutterfly黑脈金斑蝶,王蝶toxin n.毒素,毒質(zhì) 記詞根記憶：tox（毒）+in（…素）→毒素caterpillar n.毛毛蟲記 聯(lián)想記憶：cater（迎合）pillar（柱形物）→蠕動的柱形物→毛毛蟲larva n.[pl.larvae]（昆蟲）幼蟲,幼體 例Theseeggswillhatchintolarvae.這些卵將孵化成幼蟲。twig n.嫩枝,小枝 搭averysmallthinbranchbirchtwig樺樹樹枝shed vt.蛻（皮）；去除,擺脫；使（某事物）清楚理解；流淚n.小屋,棚 英togetridofsth. 記聯(lián)想記憶：she（她）+d→女孩子容易流眼淚→流淚搭 shedtheleaves樹葉落下shedlightonsth.使（問題等）較容易理解layer n.層,層次 搭alayerof一層managementlayers管理層transparent adj.透明的,清澈的；明顯的；易懂的 英（ofglass,plastic,etc.）allowingyoutoseethrough 記詞根記憶：tans（越過）+par（看）+ent（…的）→可以看穿的→透明的 搭atranspare