江苏高考英语专题三阅读理解第二节分类突破九词句猜测_代词指代题课件.pptx

《江苏高考英语专题三阅读理解第二节分类突破九词句猜测_代词指代题课件.pptx》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、九、词句猜测——代词指代题专题三第二节分类突破感悟体会名师点津内容索引随堂限时练感悟体会(2018·常州期末)GPStechnologyisoneofthelatestandgreatestdevelopmentswithinthecommunicationsworld.Alsoknownasa“globalpositioningsystem”，thistechnologyworksoffofradiosignalssentoutbysatellitesinspace.Sinceacellphonealreadyworkslikeatwo-

2、wayradiowhencommunicatingwithcelltowers，theGPScapabilitysimplyextendstheradiosignalreachtospacesatellites.Phonesequippedwithfull-featuredcapabilitiesworkoffofJava-basedradiosignalsandhavedatabaseaccesstotheirproviders’systemforotherdatalikemappingandvoices.Locationtracking

3、，andgivingdirectionstoandfromdestinationsaresomeofthemorecommonusesforthistechnology.GPSnavigationalsystemsaresupportedbyanetworkof27satellites.ThesesatellitesorbittheEarthincyclicpatterns24hoursaday.Atanygiventime，aminimumoffoursatellitessignalsisaccessibletoanyonepointon

4、Earth.Wheneverareceiverdeviceisactivated，radiowaveswithcodedmessagesaresentouttoit.Thisishowsatellitesknowtostarttrackingthedevice.Areceiver’sexactlocationisdeterminedthroughaprocesscalledtrilateration(三边测量法)wherethreesatellitesworktogethertonarrowdownpossiblelocationpoint

5、s.Afourthsatelliteisneededifthereceiverisn’tonthegroundandaltitudeiswantedaswell.Distancecalculationsaremadebasedonhowlongittakestheradiosignalstotravelbackandforthbetweenreceiverandsatellites.Themappingcapabilitiesaredisplayedonthephone’sscreenviathecellprovider’sdatabase

6、.AsaGPSdeviceneedstodoallkindsofcalculationsondifferentdatafromsatellitesandprovider’sdatabase，itconsumestime.SoitcantakequiteafewsecondsforaregularGPStoworkoutaplan.AnassistedGPScanhelpsolvetheproblem.Itisanimprovedtechnologythatusesacellnetwork’sAssistanceServerwhichisco

7、nnectedtoareferencenetworksuchastheInternet.Throughtheuseofcelltowers，aphonerelayssatellitesignalinformationtotheservers.TheseserversareabletoprocessincomingdataatmuchhigherratesthanGPSreceivers，soinformationisprocessedquicker，andistypicallymoreaccurate.语篇解读本文介绍了GPS技术是如何在手

8、机中运行的。语篇解读1.Whatdoestheunderlinedword“their”referto?A.Satellites’.B.Phones’.C.Signals’.D.