imagine the situation. you are driving along in a desert阅读理解答案

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1、Imaginethesituation.Youaredrivingalonginadesert阅读理解答案　　Imaginethesituation.Youaredrivingalonginadesertoronamountain.Youhavenoideawhereyouare.Youpassedthelasthousetwohoursago.Thenyourcarbreaksdown.Itisnightanditiscold.Youhavenomobilephone.WhatdoyoudoWell,nexttimetakeaGPSwithyou.This

2、inventionmaybeabletohelpyou.Itisadevice（装置）whichusessatellitestofindtheuser’sposition.Itcanfindyourpositiontowithin20meters.AGPScannotstartyourcar,butatleastyouwillknowwhereyouare.　　GPS,whichmeansGlobalPositioningSystem,isasmallradioreceiver.Itlookslikeamobilephone.Youcanholditinyo

3、urhand,orputinyoupocket.Itissometimesputintoawatchoratelephone.WealsofindGPSdevicesincars,planes,orboats.Someofthesedeviceshaveelectronicmaps,soyouknowwhereyouare.Forexample,inacitytheycantellyouthenameofthestreet.　　TherearethreepartstotheGlobalPositioningSystem.Thefirstpartisthere

4、ceiver.Youcanholditinyourhand,orhaveitfixedintoyourcar,plane,etc.thesecondpartisagroupofsatellitesorbitingtheEarth.Thereceivercontactsatleastfourofthesatellitesandcalculatesitsposition.Thethirdpartofthesystemisanetworkofgroundstations.Theyareallovertheworld.Theycontrolthesatellites

5、andmakesuretheyareworkingwell.　　SomepeoplethinkthatinthefuturetheGPSwillbeascommonasthemobile.Theyarebecomingcheaperandmoreandmoreaccurate（精确的）.TherearealsonewusesfortheGPS.Perhapstheywillbecomelikewatches.Everyonewillhaveoneandyouwillneverbelostagain.　　Accordingtothepassage,withth

6、ehelpoftheGPS,people_________.　　A.can’tbelostinanewcity　　B.can’tfindtheirwayindifferentcounties　　C.canlearnaboutthecultureofanunknownplace　　D.canspendtheleasttimegettingtoanotherplaceWecanlearnfromthepassagethat___________.　　A.therearethreepartstotheGPS　　B.aGPScan’tbeputintoawatch　

7、　C.aGPScanhelpyoustartyourcar　　D.theGPSarebecomingmoreandmoreexpensive　　68.Theunderlinedword“They”inparagraph3means“__________”.　　A.ReceiversB.GPSdevicesC.SatellitesD.Groundstations　　69.Thepassageismainlyabout____________.　　A.ThehistoryoftheGPSB.theintroductionofGPS　　C.theshapeofth

8、eGPSD.thethreepartsoftheGP