Unit5-單元背景探索閱讀課件

素養(yǎng)閱讀系列單元背景探索閱讀讀有所獲練有所得詞匯積累長難句分析學有所益閱讀提示：黑脈金斑蝶在北美的夏天是常見的，它們特別有趣的行為是它們的來回遷徙，并且它們被認為是唯一一種有這種行為的昆蟲。讀有所獲MonarchbutterfliesareacommonsummersightinthenorthernUnitedStatesandCanada.WhatmakesmonarchsparticularlyinterestingisthattheymigrateallthewaytoCaliforniaorMexicoandback①.Theyarethoughttobetheonlyinsectthatdoesthis.Everyyearinthelatesummermonarchsbegintheirjourneytothesouth.ThoseheadingforMexicogofirstfortheLouisiana-MississippiareaandthenflyacrosstheGulfofMexicointoTexas.OnceinMexico,theysettlethemselvesinoneofaboutfifteenplacesinamountainforestfilewithfirtrees.Eachplaceprovidesawinterhomeformillionsofmonarchs.Thebutterfliesaresomanythattheyoftencoverentiretrees.Whenspringcomes,theybegintheirlongjourneytothenorth.Thequestionisoftenaskedwhethereverybutterflymakestheround-tripjourneyeveryyear②.Andtheanswerisno.Theaveragemonarchlivesaboutninemonths.SooneflyingnorthmightlayeggsinLouisianaandthendie.TheeggsofthatgenerationmaybefoundinKentucky;theeggsofthenextgenerationmayendupinWisconsinorMichigan.Thelastgenerationoftheseason,aboutthefourth,willmaketheirwaybacktoMexicoandrestartthejourney.讀有所獲Scientistslearnaboutmonarchs,migrationbycatchingandmakingmarksontheinsects.Bycatchingagainamonarchwithsuchamarkandnoticingwhereitcamefrom,thenextscientistcangettoknowthingslikethebutterflysageanditsrouteselection.讀有所獲答案:1.C答案解析1練有所得Oneoftheplaceswheremonarchsspendthewinteris_________A.theGulfofMexicoB.anareainMississippiC.aforestinMexicoD.aplaininTexasTherouteselectionofmonarchs,migrationcanbelearned_______A.byexaminingthemarksmadeonthemB.bycollectingtheireggsinthemountainsC.bycomparingngtheirdifferentagesD.bycountingthedeadonesintheforests答案:2.A答案解析2練有所得1.particularly adv.特別地2.round-trip adj.來回的；雙程的3.endup 最后處于4.generation n.代，一代5.restart v.重新開始詞匯積累學有所益長難句分析①句意：使黑脈金斑蝶特別有趣的是，它們一路遷移到