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Students will need (21) all of their language skills in order to understand the reading selection...
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PassageFive Althoughnooneiscertainwhymigrationoccursthereareseveraltheories.OnetheoryisbaseduponthepremisethatprehistoricbirdsofthenorthenHemispherewereforcedsouthduringtheIceAgewhenglacierscoveredlargepartsofEuropeAsiaandNorthAmerica.Astheglaciersmeltedthebirdscamebacktotheirhomelandsspentthesummerandthenwentsouthagainastheiceadvancedinwinter.Intimethemigrationbecameahabitandnowalthoughtheglaciershavedisappearedthehabitcontinues. Anothertheoryproposesthattheancestralhomeofallmodernbirdswasthetropics.Whentheregionbecameoverpopulatedmanyspecieswerecrowdednorth.Duringthesummertherewasplentyoffoodbutduringthewinterscarcityforcedthemtoreturntothetropics. Amorerecenttheoryknownasphotoperiodismsuggestsarelationshipbetweenincreasingdaylightandthestimulationofcertainglandsinthebirds’bodiesthatmaypreparethemformigration.Onescientisthasbeenabletocausemidwintermigrationsbyexposingbirdstoartificialperiodsofdaylight.Hehasconcludedthatchangesoccurinthebodiesofbirdsduetoseasonalchangesinthelengthofdaylight. Whydidonescientistexposebirdstoartificialdaylight
——Hedoesnotlikemusicdoeshe——______.
IfinallygotthejobIdreamedabout.Neverinmylife______sohappy.
PassageTwo Perhapsthereisonlythemoontocomparewithit.OfalltheachievementsofAmericanengineeringonlythelandingonthemoonandtheplantingthereofawrinkledflagcanrivaltheconstructionofPanamaCanalasanepoch-makingaccomplishment.TheSuezCanalthetrans-SiberianRailroadandtheTajMahalallpalebesideit.Thecanal’sconstructionismorecloselyakintothepyramidsofEgyptinitsscopeanddifficultyofexecutionbutinthemodernerathereisonlythemoon. LikethelandingonthemoontheconstructionofacanalacrossthenarrowIsthmusofPanamawasadreamlongbeforeitbecamereality.Asearlyas1534CharlesIofSpainproposedacanalatPanamabutitwouldtakenearly400yearsforbuilderstocatchupwithhisimagination. Whenthecanalfinallywasproposedrequiredallthecreativitythetwentiethcenturycouldmuster.Itwasthelargestpublicworkeverattempted.Itsengineershadtocontrolawildrivercutthecontinentaldivideconstructthelargestdamandmanmadelakeknowntothatdateandswingthelargestlockseverconstructedfromthebiggestcementstructuresthenpoured.Alongthewaytwooftheworld’smostdevastatingdiseaseshadtobewipedoutinoneoftheirgreateststrongholds.Andallofthiswastobedonewithouttheairplaneortheautomobile:KittyHawkroseintothehead-linesin1903thesameyeartheU.S.signedatreatywithPanama——andtherewasnoroadacrosstheisthmusuntiltheWorldWarⅡ. IfPanamahashadanunusualroleinbygonedreamsitmostcertainlyhasastartlingrelationshiptothehardfactsofgeography.Thecountryisfarthereastthanmostpeopleimagine——thecanalandabouthalfofPanamaactuallylieeastofMiami.Becauseofthecountry’sshallow"S"shapeandeast-westorientationithasplaceswherethesunrisesinthePacificandsetsintheAtlantic.MoresignificantlyPanamaissqueezedintothenarrowestportionofCentral.Atthecanaljust43milesoflandseparateAtlanticandPacificshores.PerhapsevenmoreimportantPanamaoffersthelowestpointintheNorthAmericancontinentaldivide——originally312feetabovesealevelatthecanal’sCulebraCut.BycomparisonthelowestpassintheUnitedStatesisnearly5000feet. AcanalinPanamawasfirstproposedinthe
PassageOne Achildoffiveisfriendlycompetentandobedientalthoughhemaybebossywithotherchildrenandissometimessufficientlyindependenttocallhismothernames.Heisstilldependentonadultapprovalandpraiseandsoorientated对……感兴趣tothegrown-upthathetellstaleswithoutseeingtheotherchild’spointofview.Thereisnorealdiscussionyetfivestalkingtogetherindulgeina"collectivemonologue独白";quarrellingwithwordsoftenbeginstowardstheendoftheyear.Groupplayisoftendisruptedbecauseeveryonewantstobethemotherorthebrideorthecaptainofthefirebrigade.Eachchildhasanurgentneedforconstantlyrecurring反复的contactwithanadultinspiteofallhiseffortstobeindependent.Inhisunsurenesshemaymakestatementsabouthisownclevernessandbeautyhopingthattheadultwillpraisehim:thisisnotconceitbutacryforreassurance.Helovestosay"WatchwhatIcando."Realityandfantasyarestillintermingledandthisconfusionmayleadhimtoelaborateonfacts. Thepassagepointsoutthatwheneveryonewantstobethemotherorthebridegroupplayisoften
PassageThree Wespendourleisurehoursefficientlyforhigherproductionlivebytheclockevenwhentimedoesnotmattermodernizeourhomesandspeedthemachineryoflivinginorderthatwecangotothemostplacesanddothemostthingsintheshortestperiodoftimepossible.Wetrytoeatsleepandtalkefficiently.EvenonholidaysandSundaystheefficientmanrelaxesontimetablewithoneeyeontheclockandtheotheronanappointmentsheet. Tosqueezethemostoutofeachshininghourwehaveshortenedtheoperaquickenedthepaceofthemovieandputcultureinpocket-sizedpackages.Wemakethebusybeelooklikealazycreaturetheantlikeasluggard.Welivesixty-mile-minuteandthegreatefficiencysmiles. Wewishwecouldreturntothatpleasantdaywhenweconsideredtimeafriendinsteadofanenemy;whenwedidthingswillinglyandbecausewewantedtoratherthanbecauseourtimetablecalledforitButthatofcoursewouldnotbeefficiency;andweAmericansmustbeefficient. Thepassagetellsusthat
A．brought B．rough C．bought D．thought
WhatdowemeanbyaperfectEnglishpronunciationInonesensethereareasmanydifferentkindsofEnglishastherearespeakersofit.21twospeakersspeakinexactlythesameway.Wecanalwaysheardifferences22themandthepronunciationofEnglishvariesagreatdealindifferentgeographical23.HowdowedecidewhatsortofEnglishtouseasamodelThisisnotaquestionthatcanbe24inthesamewayforallforeignlearnersofEnglish.WhenyouliveinapartoftheworldlikeIndiaorWestAfricawherethereisalong25ofspeakingEnglishforgeneralcommunicationpurposesyoushould26toacquireagoodvarietyofthepronunciationofthisarea.ItwouldbeafashioninthesecircumstancestouseasamodelBBCEnglishor27ofthesort.Ontheotherhandifyouliveinacountry28thereisnotraditionaluseofEnglish.YoumusttakeasyourmodelsomeformofnativeEnglishpronunciation.Itdoesnot29verymuchwhichformyouchoose.Themost30wayistotakeasyourmodelthesortOfEnglishyoucanhearmostoften. 24
WhatdowemeanbyaperfectEnglishpronunciationInonesensethereareasmanydifferentkindsofEnglishastherearespeakersofit.21twospeakersspeakinexactlythesameway.Wecanalwaysheardifferences22themandthepronunciationofEnglishvariesagreatdealindifferentgeographical23.HowdowedecidewhatsortofEnglishtouseasamodelThisisnotaquestionthatcanbe24inthesamewayforallforeignlearnersofEnglish.WhenyouliveinapartoftheworldlikeIndiaorWestAfricawherethereisalong25ofspeakingEnglishforgeneralcommunicationpurposesyoushould26toacquireagoodvarietyofthepronunciationofthisarea.ItwouldbeafashioninthesecircumstancestouseasamodelBBCEnglishor27ofthesort.Ontheotherhandifyouliveinacountry28thereisnotraditionaluseofEnglish.YoumusttakeasyourmodelsomeformofnativeEnglishpronunciation.Itdoesnot29verymuchwhichformyouchoose.Themost30wayistotakeasyourmodelthesortOfEnglishyoucanhearmostoften. 22
PassageOne Achildoffiveisfriendlycompetentandobedientalthoughhemaybebossywithotherchildrenandissometimessufficientlyindependenttocallhismothernames.Heisstilldependentonadultapprovalandpraiseandsoorientated对……感兴趣tothegrown-upthathetellstaleswithoutseeingtheotherchild’spointofview.Thereisnorealdiscussionyetfivestalkingtogetherindulgeina"collectivemonologue独白";quarrellingwithwordsoftenbeginstowardstheendoftheyear.Groupplayisoftendisruptedbecauseeveryonewantstobethemotherorthebrideorthecaptainofthefirebrigade.Eachchildhasanurgentneedforconstantlyrecurring反复的contactwithanadultinspiteofallhiseffortstobeindependent.Inhisunsurenesshemaymakestatementsabouthisownclevernessandbeautyhopingthattheadultwillpraisehim:thisisnotconceitbutacryforreassurance.Helovestosay"WatchwhatIcando."Realityandfantasyarestillintermingledandthisconfusionmayleadhimtoelaborateonfacts. Afive-year-oldchildsometimesshowshisindependenceby
PassageTwo Perhapsthereisonlythemoontocomparewithit.OfalltheachievementsofAmericanengineeringonlythelandingonthemoonandtheplantingthereofawrinkledflagcanrivaltheconstructionofPanamaCanalasanepoch-makingaccomplishment.TheSuezCanalthetrans-SiberianRailroadandtheTajMahalallpalebesideit.Thecanal’sconstructionismorecloselyakintothepyramidsofEgyptinitsscopeanddifficultyofexecutionbutinthemodernerathereisonlythemoon. LikethelandingonthemoontheconstructionofacanalacrossthenarrowIsthmusofPanamawasadreamlongbeforeitbecamereality.Asearlyas1534CharlesIofSpainproposedacanalatPanamabutitwouldtakenearly400yearsforbuilderstocatchupwithhisimagination. Whenthecanalfinallywasproposedrequiredallthecreativitythetwentiethcenturycouldmuster.Itwasthelargestpublicworkeverattempted.Itsengineershadtocontrolawildrivercutthecontinentaldivideconstructthelargestdamandmanmadelakeknowntothatdateandswingthelargestlockseverconstructedfromthebiggestcementstructuresthenpoured.Alongthewaytwooftheworld’smostdevastatingdiseaseshadtobewipedoutinoneoftheirgreateststrongholds.Andallofthiswastobedonewithouttheairplaneortheautomobile:KittyHawkroseintothehead-linesin1903thesameyeartheU.S.signedatreatywithPanama——andtherewasnoroadacrosstheisthmusuntiltheWorldWarⅡ. IfPanamahashadanunusualroleinbygonedreamsitmostcertainlyhasastartlingrelationshiptothehardfactsofgeography.Thecountryisfarthereastthanmostpeopleimagine——thecanalandabouthalfofPanamaactuallylieeastofMiami.Becauseofthecountry’sshallow"S"shapeandeast-westorientationithasplaceswherethesunrisesinthePacificandsetsintheAtlantic.MoresignificantlyPanamaissqueezedintothenarrowestportionofCentral.Atthecanaljust43milesoflandseparateAtlanticandPacificshores.PerhapsevenmoreimportantPanamaoffersthelowestpointintheNorthAmericancontinentaldivide——originally312feetabovesealevelatthecanal’sCulebraCut.BycomparisonthelowestpassintheUnitedStatesisnearly5000feet. Inscopeanddifficultythecanalsconstructionwasmostcloselyaliketothatofthe
A.Onlytwo. B.Becauseofaheavyfog. C.7:30pm. D.Thegreatfavoriteofmine. E.Noproblem. F.Twohoursago. G.Enjoyyourself. H.No.Thankyoujustthesame. Bob:ProfessorDavisIwonderifIcouldenrollinyourbiologycourseNancy:
Thebookisso______Ireturnedtothelibrarywithoutfinishingit.
Here’samanwhojustbreaksintoabankandhelpshimself______somuchmoney.
Insteadof______sightsEdisonwouldspendthetime______inthepubliclibrary.
PassageThree Oceanographyhasbeendefinedas"Theapplicationofallsciencestothestudyofthesea". Beforethenineteenthcenturyscientistswithaninterestintheseawerefewandfarbetween.CertainlyNewtonconsideredsometheoreticalaspectsofitinhiswritingsbuthewasreluctant不愿意togotoseatofurtherhiswork. Formostpeopletheseawasremoteandwiththeexceptionofearlyintercontinentaltravellersorotherswhoearnedalivingfromtheseatherewaslittlereasontoaskmanyquestionsaboutitletalonetoaskwhatlaybeneaththesurface.Thefirsttimethatthequestion"Whatisatthebottomoftheoceans"hadtobeansweredwithanycommercialconsequencewaswhenthelayingofatelegraphcablefromEuropetoAmericawasproposed.Theengineershadtoknowthedepthprofile起伏形状oftheroutetoestimatethelengthofcablethathadtobemanufactured. ItwastoMauryoftheU.S.NavythattheAtlanticTelegraphCompanyturnedin1853forinformationonthismatter.Inthe1840sMauryhadbeenresponsibleforencouragingvoyagesduringwhichsoundingsweretakentoinvestigatethedepthsoftheNorthAtlanticandPacificOceans.LatersomeofhisfindingsarousedmuchpopularinterestinhisbookThePhysicalGeographyoftheSea. Thecablewaslaidbutnotuntil1866wastheconnectionmadepermanentandreliable.Attheearlyattemptsthecablefailedandwhenitwastakenoutforrepairsitwasfoundtobecoveredinlivinggrowthsafactwhichdefiedcontemporaryscientificopinionthattherewasnolifeinthedeeperpartsofthesea. Withinafewyearsoceanographywasunderway.In1872Thomsonledascientificexpedition考察whichlastedforfouryearsandbroughthomethousandsofsamplesfromthesea.Theirclassificationandanalysisoccupiedscientistsforyearsandledtoafive-volumereportthelastvolumebeingpublishedin1895. Thispassageismainlyabout
WhatdowemeanbyaperfectEnglishpronunciationInonesensethereareasmanydifferentkindsofEnglishastherearespeakersofit.21twospeakersspeakinexactlythesameway.Wecanalwaysheardifferences22themandthepronunciationofEnglishvariesagreatdealindifferentgeographical23.HowdowedecidewhatsortofEnglishtouseasamodelThisisnotaquestionthatcanbe24inthesamewayforallforeignlearnersofEnglish.WhenyouliveinapartoftheworldlikeIndiaorWestAfricawherethereisalong25ofspeakingEnglishforgeneralcommunicationpurposesyoushould26toacquireagoodvarietyofthepronunciationofthisarea.ItwouldbeafashioninthesecircumstancestouseasamodelBBCEnglishor27ofthesort.Ontheotherhandifyouliveinacountry28thereisnotraditionaluseofEnglish.YoumusttakeasyourmodelsomeformofnativeEnglishpronunciation.Itdoesnot29verymuchwhichformyouchoose.Themost30wayistotakeasyourmodelthesortOfEnglishyoucanhearmostoften. 30
PassageFour Whyistherenorisktothecustomerwhenabankprintsthecustomer’snametohischeques Whenanyoneopensacurrentaccountatabankheislendingthebankmoneyrepaymentofwhichhemaydemandatanytimeeitherincashorbydrawingacheckinfavorofanotherperson.Primarilythebank-customerrelationshipisthatofdebtorandcreditorwhoiswhichdependingonwhetherthecustomer’saccountisincreditoroverdrawn.Butinadditiontothatbasicallysimpleconceptthebankanditscustomerowealargenumberofobligationstooneanother.Manyoftheseobligationscangiverisetoproblemsandcomplicationsbutabankcustomerunlikesayabuyerofgoodscannotcomplainthatthelawisloadedagainsthim. Thebankmustobeyitscustomer’sinstructionsandnotthoseofanyoneelse.Whenforexampleacustomerfirstopensanaccountheinstructsthebanktodebit把……记入借方hisaccountonlyinrespectofchecksdrawnbyhimself.Hegivesthebankspecimensofhissignatureandthereisaveryfirmrulethatthebankhasnorightorauthoritytopayoutacustomer’smoneyonacheckonwhichitscustomer’ssignaturehasbeenforged.Itmakesnodifferencethattheforgerymayhavebeenaveryskillfulone:thebankmustrecognizeitscustomer’ssignature.Forthisreasonthereisnorisktothecustomerinthepracticeadopteddaybanksofprintingthecustomer’snameonhischecksffthisfacilitatesforgeryitisthebankwhichwilllosenotthecustomer. Ifsomeoneforgedyoursignatureanddrewmoneyfromyouraccount
WhatdowemeanbyaperfectEnglishpronunciationInonesensethereareasmanydifferentkindsofEnglishastherearespeakersofit.21twospeakersspeakinexactlythesameway.Wecanalwaysheardifferences22themandthepronunciationofEnglishvariesagreatdealindifferentgeographical23.HowdowedecidewhatsortofEnglishtouseasamodelThisisnotaquestionthatcanbe24inthesamewayforallforeignlearnersofEnglish.WhenyouliveinapartoftheworldlikeIndiaorWestAfricawherethereisalong25ofspeakingEnglishforgeneralcommunicationpurposesyoushould26toacquireagoodvarietyofthepronunciationofthisarea.ItwouldbeafashioninthesecircumstancestouseasamodelBBCEnglishor27ofthesort.Ontheotherhandifyouliveinacountry28thereisnotraditionaluseofEnglish.YoumusttakeasyourmodelsomeformofnativeEnglishpronunciation.Itdoesnot29verymuchwhichformyouchoose.Themost30wayistotakeasyourmodelthesortOfEnglishyoucanhearmostoften. 26
PassageFour Whyistherenorisktothecustomerwhenabankprintsthecustomer’snametohischeques Whenanyoneopensacurrentaccountatabankheislendingthebankmoneyrepaymentofwhichhemaydemandatanytimeeitherincashorbydrawingacheckinfavorofanotherperson.Primarilythebank-customerrelationshipisthatofdebtorandcreditorwhoiswhichdependingonwhetherthecustomer’saccountisincreditoroverdrawn.Butinadditiontothatbasicallysimpleconceptthebankanditscustomerowealargenumberofobligationstooneanother.Manyoftheseobligationscangiverisetoproblemsandcomplicationsbutabankcustomerunlikesayabuyerofgoodscannotcomplainthatthelawisloadedagainsthim. Thebankmustobeyitscustomer’sinstructionsandnotthoseofanyoneelse.Whenforexampleacustomerfirstopensanaccountheinstructsthebanktodebit把……记入借方hisaccountonlyinrespectofchecksdrawnbyhimself.Hegivesthebankspecimensofhissignatureandthereisaveryfirmrulethatthebankhasnorightorauthoritytopayoutacustomer’smoneyonacheckonwhichitscustomer’ssignaturehasbeenforged.Itmakesnodifferencethattheforgerymayhavebeenaveryskillfulone:thebankmustrecognizeitscustomer’ssignature.Forthisreasonthereisnorisktothecustomerinthepracticeadopteddaybanksofprintingthecustomer’snameonhischecksffthisfacilitatesforgeryitisthebankwhichwilllosenotthecustomer. Oneoftheobligationsabankhastoacustomer
A.Onlytwo. B.Becauseofaheavyfog. C.7:30pm. D.Thegreatfavoriteofmine. E.Noproblem. F.Twohoursago. G.Enjoyyourself. H.No.Thankyoujustthesame. Henry:HowmanysciencecoursesdidyouhaveinhighschoolJane:
PassageFive Althoughnooneiscertainwhymigrationoccursthereareseveraltheories.OnetheoryisbaseduponthepremisethatprehistoricbirdsofthenorthenHemispherewereforcedsouthduringtheIceAgewhenglacierscoveredlargepartsofEuropeAsiaandNorthAmerica.Astheglaciersmeltedthebirdscamebacktotheirhomelandsspentthesummerandthenwentsouthagainastheiceadvancedinwinter.Intimethemigrationbecameahabitandnowalthoughtheglaciershavedisappearedthehabitcontinues. Anothertheoryproposesthattheancestralhomeofallmodernbirdswasthetropics.Whentheregionbecameoverpopulatedmanyspecieswerecrowdednorth.Duringthesummertherewasplentyoffoodbutduringthewinterscarcityforcedthemtoreturntothetropics. Amorerecenttheoryknownasphotoperiodismsuggestsarelationshipbetweenincreasingdaylightandthestimulationofcertainglandsinthebirds’bodiesthatmaypreparethemformigration.Onescientisthasbeenabletocausemidwintermigrationsbyexposingbirdstoartificialperiodsofdaylight.Hehasconcludedthatchangesoccurinthebodiesofbirdsduetoseasonalchangesinthelengthofdaylight. Thispassagesupportsthebeliefthat
WhatdowemeanbyaperfectEnglishpronunciationInonesensethereareasmanydifferentkindsofEnglishastherearespeakersofit.21twospeakersspeakinexactlythesameway.Wecanalwaysheardifferences22themandthepronunciationofEnglishvariesagreatdealindifferentgeographical23.HowdowedecidewhatsortofEnglishtouseasamodelThisisnotaquestionthatcanbe24inthesamewayforallforeignlearnersofEnglish.WhenyouliveinapartoftheworldlikeIndiaorWestAfricawherethereisalong25ofspeakingEnglishforgeneralcommunicationpurposesyoushould26toacquireagoodvarietyofthepronunciationofthisarea.ItwouldbeafashioninthesecircumstancestouseasamodelBBCEnglishor27ofthesort.Ontheotherhandifyouliveinacountry28thereisnotraditionaluseofEnglish.YoumusttakeasyourmodelsomeformofnativeEnglishpronunciation.Itdoesnot29verymuchwhichformyouchoose.Themost30wayistotakeasyourmodelthesortOfEnglishyoucanhearmostoften. 28
PassageTwo Perhapsthereisonlythemoontocomparewithit.OfalltheachievementsofAmericanengineeringonlythelandingonthemoonandtheplantingthereofawrinkledflagcanrivaltheconstructionofPanamaCanalasanepoch-makingaccomplishment.TheSuezCanalthetrans-SiberianRailroadandtheTajMahalallpalebesideit.Thecanal’sconstructionismorecloselyakintothepyramidsofEgyptinitsscopeanddifficultyofexecutionbutinthemodernerathereisonlythemoon. LikethelandingonthemoontheconstructionofacanalacrossthenarrowIsthmusofPanamawasadreamlongbeforeitbecamereality.Asearlyas1534CharlesIofSpainproposedacanalatPanamabutitwouldtakenearly400yearsforbuilderstocatchupwithhisimagination. Whenthecanalfinallywasproposedrequiredallthecreativitythetwentiethcenturycouldmuster.Itwasthelargestpublicworkeverattempted.Itsengineershadtocontrolawildrivercutthecontinentaldivideconstructthelargestdamandmanmadelakeknowntothatdateandswingthelargestlockseverconstructedfromthebiggestcementstructuresthenpoured.Alongthewaytwooftheworld’smostdevastatingdiseaseshadtobewipedoutinoneoftheirgreateststrongholds.Andallofthiswastobedonewithouttheairplaneortheautomobile:KittyHawkroseintothehead-linesin1903thesameyeartheU.S.signedatreatywithPanama——andtherewasnoroadacrosstheisthmusuntiltheWorldWarⅡ. IfPanamahashadanunusualroleinbygonedreamsitmostcertainlyhasastartlingrelationshiptothehardfactsofgeography.Thecountryisfarthereastthanmostpeopleimagine——thecanalandabouthalfofPanamaactuallylieeastofMiami.Becauseofthecountry’sshallow"S"shapeandeast-westorientationithasplaceswherethesunrisesinthePacificandsetsintheAtlantic.MoresignificantlyPanamaissqueezedintothenarrowestportionofCentral.Atthecanaljust43milesoflandseparateAtlanticandPacificshores.PerhapsevenmoreimportantPanamaoffersthelowestpointintheNorthAmericancontinentaldivide——originally312feetabovesealevelatthecanal’sCulebraCut.BycomparisonthelowestpassintheUnitedStatesisnearly5000feet. Thecanalwasbuiltwiththehelpof
Thechangesinthecitywillcostusalotofmoney______theywillsaveusmoneyinthefuture.
Thoughhehadoftenmadehislittlesister______todayhewasmadebyhislittlesister.
PassageFive Althoughnooneiscertainwhymigrationoccursthereareseveraltheories.OnetheoryisbaseduponthepremisethatprehistoricbirdsofthenorthenHemispherewereforcedsouthduringtheIceAgewhenglacierscoveredlargepartsofEuropeAsiaandNorthAmerica.Astheglaciersmeltedthebirdscamebacktotheirhomelandsspentthesummerandthenwentsouthagainastheiceadvancedinwinter.Intimethemigrationbecameahabitandnowalthoughtheglaciershavedisappearedthehabitcontinues. Anothertheoryproposesthattheancestralhomeofallmodernbirdswasthetropics.Whentheregionbecameoverpopulatedmanyspecieswerecrowdednorth.Duringthesummertherewasplentyoffoodbutduringthewinterscarcityforcedthemtoreturntothetropics. Amorerecenttheoryknownasphotoperiodismsuggestsarelationshipbetweenincreasingdaylightandthestimulationofcertainglandsinthebirds’bodiesthatmaypreparethemformigration.Onescientisthasbeenabletocausemidwintermigrationsbyexposingbirdstoartificialperiodsofdaylight.Hehasconcludedthatchangesoccurinthebodiesofbirdsduetoseasonalchangesinthelengthofdaylight. Accordingtothetheoryofphotoperiodism
外语系打算举行一次茶话会teaparty庆祝程教授从事英语教学30周年anniversary．茶话会定于下周五即6月20日7时举行请你写信邀请Brown教授参加并以愉快的心情盼望他的光临
TheflowersaresobeautifulthatIwoulddo______Icantosavethem.
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