Unit7Cross-curricularconnection课件沪教版八年级英语下册

SpaceexplorationCross-curricularconnectionPre-readingDoyouevergoonroadtripswithyourfamily?Howdoyoufindyourway?Doyouuseanymapapps?Howdoestheapphelpyoufindyourwaytothedestination?Theappshowsuswhereweare.Itgivesusthefastestwaytogettothedestination,anditalsotellsuswheretodriveandwhentoturn.Theappalsoshowsustrafficinrealtime.Howdoestheappknowwhereyouare?Itusessignalsfromsatellitesinspace.navigation/ˌnævɪˈɡeɪʃn/导航satellite/ˈsætəlaɪt/卫星Discussinpairs.HowdoesBDSWork?Let’sexplorethesciencebehindit!HowBDSworksWhatisBDS?BDS,officiallyknownastheBeiDouNavigationSatelliteSystem,isoneoftheglobalnavigationsatellitesystems.HowdoesBDSwork?BDSisagroupofsatellitesinorbitaroundtheEarth.EachsatellitesendsradiosignalstotheEarthwithinformation.Thesignalsanswertwoimportantquestions:“Whereinspaceisthesatellite?”and“Whendidthesignalleavethesatellite?”Theradiosignaltravelsthroughspaceatthespeedoflight—thatis299,792kilometresasecond!BackhereonEarth,yourphonereceivesthesignalandcomparesittotheexacttimeofarrival.Thephonethencalculateshowfaritisfromthesatellite.Onesatelliteisnotenough.Yourphoneneedsinformationfromfoursatellitestocalculateyourlocation.Itdoesthisallthetime.So,whenweuseaBDSdevice,wewon’tgetlost.What’sspecialaboutBDS?WecanalsouseBDSfortwo-waycommunication.Inareaswithoutanymobilenetwork,peoplecansendtextmessagesthroughBeiDousatellites.HowdoweuseBDS?IfyourphonesupportsBDS,itwillautomaticallypickthenavigationsystemwiththebestsignalatthetime.CanweuseBDSoutsideChina?Yes,wecanuseBDSoutsideChina,butitsaccuracyishigherinChinaandtheAsia-Pacificregion.BDS=BeiDouNavigationSatelliteSystemItisaGlobalNavigationSatelliteSystem(GNSS).IthelpsusfindourlocationanywhereonEarth.Readthedefinition.Whatdoes“BDS”standfor,andwhatisit?Whatisitusedfor?While-reading–WhatisBDS?WherearetheBDSsatellites?2.WhatdothesatellitessendtotheEarth?3.HowcanwereceivetheBDSsignals?4.Howmanysatellitesdoesyourphoneneedtocalculateyourlocation?

TheyareinorbitaroundtheEarth.Radiosignalswithinformationabouttheirlocationandtime.WecanreceivethesignalswithaphoneorotherdevicethatsupportsBDS.Four.Lookatthetextandanswerthequestions.While-reading–HowdoesBDSwork?1.WhatisspecialaboutBDS?WecanuseBDSfortwo-waycommunication.Inareaswithoutanymobilenetwork,GPSonlyallowsyoutoreceivesignals,butpeoplecanbothreceiveandsendtextmessagesthroughBeidousatellites.Example:Theengineonashipbreaksdownwhenafishermanisoutatsea.Thereisnomobilenetwork,andtheship’sradiodoesn’twork.WithGPS,thefishermancanonlygethislocation,buthecannotcommunicate.IfhehasaspecialBDSdevice,hecansendanSOSmessagewithhislocation.HecanalsoreceivemessageswiththeBDSdevice.2.Inwhatsituationsmightthisfeaturebeuseful?While-reading–ThespecialfeaturesofBDSIngroups,discusshowBDShelpsthesepeople.FarmersTaxidrivers/DeliverydriversScientistsPilots/SailorsYou(Walking,biking,findingfriends,…)Chooseoneortwoofthegroupsabove.HowdoesBDShelpthem?HowcanBDShelpyou?Shareyourideaswiththeclass.Post-readingAtimeline:thedevelopmentofBDSTimeEvent2000TheBDS-1(experiment)systemwascompletedaround2000andbeganprovidinglimitedregionalnavigationservicesinChina.2012TheBDS-2systemwascompletedin2012andbeganprovidingregionalnavigationservicesintheAsia-Pacificregion.2020TheBDS-3systemwascompletedin2020whenitsfinalsatellitewaslaunched.Itsnavigationservicesbecameavailableallovertheworld.NowBDSisusedbymillionsofpeopleworldwidefornavigation,timing,andmanyotherservices.Post-reading评价内容评分（1-5）1.我能理解北斗导航的定义、工作原理及应用。123453.我能绘制北斗导航工作流程图并进行解释。123454.我能关联跨学科知识，理解北斗导航的工作原理。123455.我能认识到北斗导航的价值，增强对中国科技成就的认同感。12345Self-assessmentHomeworkEachgroupchoosesoneofthefollowingtopics(oranothertopicrelatedtoChina’sspaceprogramme).China’smannedspaceprogrammeChina’slunarexplorationprogrammeLongMarchrocketsseriesTianwenMarsmissionTask:Findinformationaboutthetopicandmakeasimpletimelineaboutit.Resources:VisitEnglishscienceornewswebsites.YoumayuseAItoolstohelpyoufindinformationandorganizeyourideas.hitv.碰撞；撞击

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