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1、精品文档1996年5月托福阅读全真试题Question1-12Orchidsareuniqueinhavingthemosthighlydevelopedofallblossoms,inwhichtheusualmaleandfemalereproductiveorgansarefusedinasinglestructurecalledthecolumn.Thecolumnisdesignedsothatasinglepollinationwillfertilizehundredsofthousands,andinsomecasesmillions,ofseeds,somicrosco
2、picandlighttheyareeasilycarriedbythebreeze.Surroundingthecolumnarethreesepalsandthreepetals,sometimeseasilyrecognizableassuch,oftendistortedintogorgeous,weird,butalwaysfunctionalshapes.Themostnoticeableofthepetalsiscalledthelabellum,orlip.Itis2016全新精品资料-全新公文范文-全程指导写作–独家原创38/38精品文档oftendramatical
3、lymarkedasanunmistakablelandingstriptoattractthespecificinsecttheorchidhaschosenasitspollinator.Toluretheirpollinatorsfromafar,orchidsuseappropriatelyintriguingshapes,colors,andscents.Atleast50differentaromaticcompoundshavebeenanalyzedintheorchidfamily,eachblendedtoattractone,oratmostafew,specie
4、sofinsectsorbirds.Someorchidsevenchangetheirscentstointerestdifferentinsectsatdifferenttimes.Oncetherightinsecthasbeenattracted,someorchidspresentallsortsofone-wayobstaclecoursestomakesureitdoesnotleaveuntilpollenhasbeenaccurately2016全新精品资料-全新公文范文-全程指导写作–独家原创38/38精品文档placedorremoved.Bysuchingeni
5、ousadaptationstospecificpollinators,orchidshaveavoidedthehazardsoframpantcrossbreedinginthewild,assuringthesurvivalofspeciesasdiscreteidentities.Atthesametimetheyhavemadethemselvesirresistibletocollectors.1.Whatdoesthepassagemainlydiscuss?(A)Birds(B)Insects(C)Flowers(D)Perfume2.Theorchidisunique
6、becauseof(A)thehabitatinwhichitlives(B)thestructureofitsblossom(C)thevarietyofproductsthancanbemadefrom2016全新精品资料-全新公文范文-全程指导写作–独家原创38/38精品文档it(D)thelengthofitslife3.Theword“fused”inline3isclosetinmeaningto(A)combined(B)hidden(C)fertilized(D)produced4.Howmanyorchidseedsaretypicallypollinatedaton
7、etime?(A)200(B)2,000(C)20,000(D)200,0005.Whichofthefollowingisakindofpetal?(A)Thecolumn(B)The2016全新精品资料-全新公文范文-全程指导写作–独家原创38/38精品文档sepal(C)Thestem(D)Thelabellum6.Thelabellum(line10)ismostcomparableto(A)amicroscope(B)anobstac
