全新版 大学英语 快速阅读第一册 Unit8素文整理Word格式.docx
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Oneofthegreatestmysteriesinbiology-howthemonarchbutterfly(帝王蝶)travelsthousandsofkilometersonitsyearlymigration(迁移)-hasjustbeensolved.
Monarchbutterfliesusethesuntosettheirbodyclocksandmaketheirjourneys,accordingtoUSscientists.NootherbutterflyintheworldmigratesliketheorangeandblackmonarchsofNorthAmerica.Theycannotliveforlongperiodsincoldweather.Eachautumn,thousandstravelupto3,000kmtospendthewinterinthemountainsofMexico.Therearesomany,theyalmostblockoutthesky,andyoucanheartheirwingsbeating.
ItusuallytakesthebutterfliestwomonthstoreachMexico.Afterstayingfivemonths,theyheadbackupnorthinthespring.Butnotonebutterflyfinishesthewholeround-trip.Theylayeggsalongthewayanddie.
Threegenerationsofbutterflieswillliveanddieduringthespringjourneyalone.Thefourthandfinalgenerationoftheyearisborninearlyautumnandwillreachthenorth.ButithardlygetstorestbeforestartingthelongjourneysouthtoMexico.
ThemostamazingthingaboutthesebutterfliesisthattheyreturntotheverysametreeinMexicothattheirgreat-great-grandparentsusedthewinterbefore.Paststudieshaveshownthattheinsectsusethesunasacompass(指南针)toshowthemtheway.Butexpertsareunsurehowthebutterflieschangetheirdirectionasthesunmovesinthesky.
Thisnewstudynowshowsthattheinsectsusea“circadian(生理节奏的)”clockintheirbodiesaspartoftheirsuncompass.Inlaboratorytests,monarchbutterflieswerefoundtoflyintherightdirectionundernormaldaylighthours.Butthoseflyingin24-hourlightheadedstraighttowardsthesun.Thatis,theynolongerhadanysenseoftime.
ScientistStevenReppert,wholedtheresearch,said:
“Wehaveshowntheneedforthecircadianclockformonarchbutterflymigration.Whentheclockisinterrupted,monarchsareunabletoflytowardsMexico.”
(Words:
334)
1.Whatisthefocusofthepassage?
A)Monarchbutterflies’yearlymigration.
B)Theuniquelivingstyleofmonarchbutterflies.
C)Theguidanceofthesuninmonarchbutterflies’navigation.
D)Monarchbutterfliesusebodyclocksaspartoftheirsuncompass.
2.Whichofthefollowingstatementsistrueaboutmonarchbutterflies?
A)EachautumntheyflynorthtoNorthAmerica.
B)InspringtheyflysouthtoMexico.
C)Onlyafewofthemcanfinishtheroundtrip.
D)Theircolorisorangeandblack.
3.Themostsurprisingfindingaboutthebutterfliesisthat________.
A)notonebutterflyfinishesthewhole-roundtrip
B)theycanfindthesametreeinMexicothattheirgreat-great-grandparentsusedthewinterbefore
C)ittakesaslongastwomonthsforthebutterfliestoflytoMexico
D)theyusethesunasacompass
4.Whatcanbelearnedfromthepassageaboutpaststudiesandthenewdiscovery?
A)Paststudiesdiscoveredthenewfunctionofabodyclock.
B)Thenewstudydiscoverstheuseofthesunasacompass.
C)Thenewdiscoverythrowslightonanoldmystery.
D)Paststudiesshowedhowthebutterfliescouldchangedirection.
5.Whatwasfoundinthelaboratory?
A)Monarchbutterflieslosttheirsenseoftime.
B)Thesunwasnotimportantintheirmigration.
C)Butterfliesflyingin24-hourlightlosttheirsenseoftime.
D)Theirbodyclockswereinterruptedbythesun.
Passage2
5分45秒
Atpresent,therearemanywaystotravel,thatis,wecanchoosedifferentwaystogotosomeplace.
InChina,moreandmorepeoplehavetheirowncars.Therefore,theroadsaregettingbusierandbusierandsometimestherearemanytrafficjams,especiallyinthebigcities.Howcanwesolvethisproblem?
Ontheearththepopulationisgrowinglargerandlargerandtherewillbelessandlessspace.Sosomescientistsaretryingtomakeanewkindofcar-aflyingcar.Aflyingcarisacarthatnotonlyrunsontheroad,butalsofliesintheskywheneverthereisheavytraffic.Itisjustlikeabat(蝙蝠),asithaswings.Whenthecarrunsontheground,thewingsarefolded.However,whenitflies,thewingsareunfolded.Itcanflyattheheightof1,500-3,000meters,anditcanflyatthespeedof600kilometersperhour.
Therewillbeanotherkindoftraininthefuture.Maybeitwillbecalledthe“flyingtrain”-itlookslikeaplane,butithasnowings.Itcanrunnearthegroundbutitdoesn’ttouchtheground.Itwillbemuchfasterthananytraincurrentlyavailable.AJapanesescientistsaysthiskindofflyingtraincanbemadebytheyear2020.
So,perhapsitispossiblethatcarsandtrainscanflyintheskyinthefuture.Actually