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1、Passage1DigitalCameras[00:45.70]①Accordingtoastandarddefinition,/[00:48.34]adigitalcameraisacamerathatproducesdigitalimages/[00:53.63]thatcanbestoredinacomputer,displayedonascreenandprinted./[01:00.17]②Yearsagopeopleusedtopossesstwodifferentdevices/[01:04.47]inordertotakepicturesandmakevideos./[01:
2、08.42]③Thecreationofdigitalcameraswasmotivatedmainlybytwofactors./[01:14.04]④First,needtosparespace./[01:17.78]⑤Second,makeitmorecomfortableforpeople[01:21.07]todoboththingswithhigherqualityresults./[01:25.49]⑥Themulti-functionalismofdigitalcameras[01:28.62]andthecombinationofseveraldevicesinone/[0
3、1:32.12]makeitapopularchoiceforamodernman./[01:35.99]⑦Foryearsadigitalcamerahasbeenunaffordableformanyfamilies./[01:41.39]⑧However,thevarietyofdigitalcamerasandvariouspricesnowadays/[01:47.06]makeitpossibleforalmosteverysinglefamilytobuyadigitalcamera./[01:52.92]⑨Withincreasinglyfiercecompetition,/
4、[01:55.51]thedigitalcameramanufacturerssatisfycustomers[02:00.35]withlowerpricesbutbestqualitystandards.Passage2TheMigrationofBirds[00:48.91]①Themostobviousfeatureofbirdsisthattheycanfly./[00:52.81]②Thisfacilitygivesthemgreatmobilityandcontrolovertheirmovements./[00:58.39]③Manyspeciescantravelquick
5、lyandeconomicallyoverlongdistances—/[01:04.28]uptothousandsofkilometers,/[01:07.14]ifnecessary,crossingseas,desertsorotherinhospitableareas./[01:13.46]④Theyalsohavegreatorientationandnavigationalskills,/[01:18.14]andareabletorememberandre-find[01:21.42]remoteplacestheyhavepreviouslyvisited./[01:24.
6、61]⑤Birdscantherebyoccupywidelyseparatedareasatdifferentseasons,/[01:30.80]returningrepeatedlytothesamelocalitiesfromyeartoyear./[01:35.76]⑥Althoughmigrationisevidentinotheranimalgroups,/[01:40.09]includinginsects,mammals,andfish,/[01:43.49]innoneisitaswidelyandwelldevelopedasinbirds./[01:48.22]⑦Th
7、ecollectivetravelroutesofbirdsspanalmosttheentireplanet./[01:53.69]⑧Asaresultofmigration,birddistributionsarecontinuallychanging—/[02:00.05]onregularseasonalpatterns,andonlocal,regionalorglobalscales.Passag
