43.Satellitesareanimportantpartofourordinarylives.Forexample,theinformationforweatherforecastsissentbysatellite.SomesatelliteshavecameraswhichtakephotographsoftheEarthtoshowhowcloudsaremoving.Satellitesarealsousedt
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Satellitesareanimportantpartofourordinarylives.Forexample,theinformationforweatherforecastsissentbysatellite.SomesatelliteshavecameraswhichtakephotographsoftheEarthtoshowhowcloudsaremoving.Satellitesarealsousedtoconnectourinternationalphonecalls.
ComputerconnectionsoftheWorldWideWebandInternetalsousesatellites.ManyofourTVprogramscometousthroughsatellites.Airplanepilotsalsosometimesuseasatellitetohelpthemfindtheirexactlocation.
Weusesatellitestosendtelevisionpicturesfromonepartoftheworldtoanother.Theyareusually35,880kilometersabovetheequator.Sometimeswecanseeasatelliteintheskyanditseemstostayinthesameplace.Thisisbecauseitismovingaroundtheworldat11,000kilometersanhour—exactlythesamespeedthattheearthrotates.AsatellitemustorbittheEarthwithitsantennae(天线)facingtheEarth.Sometimes,itmovesawayfromitsorbit,sotherearelittlerocketsonitwhichareusedtoputthesatellitebackintherightposition.Thisusuallyhappensabouteveryfiveorsixdays.
Spaceisnotempty!Everyweek,moreandmoresatellitesaresentintospacetoorbittheEarth.Asatelliteusuallyworksforabout10-12years.SatelliteswhicharebrokenaresometimesrepairedbyastronautsorsometimesbroughtbacktoEarthtoberepaired.Often,veryoldorbrokensatellitesareleftinspacetoorbittheEarthforaverylongtime.Thisisveryseriousbecausesomesatellitesusenuclearpower(核动力)andtheycancrashintoeachother.
(1).[本题2分]WhichofthefollowingisNOTdonebysatellitesaccordingtothepassage?
(A)Sendinginformationforweatherforecasts.
(B)SendingTVpictures.
(C)Providingfoodforairplanepilots.
(D)TakingphotographsoftheEarth.
(2).[本题2分]What’sthespeedtheEarthrotatesat?
(A)35,880kilometersperhour.
(B)11,000kilometersperhour.
(C)111,000kilometersperhour.
(D)335,880kilometersperhour.
(3).[本题2分]Whatdoestheunderlinedword“This”inparagraph3referto?
(A)Asatelliteseemstostayinthesameplaceinthesky.
(B)Asatellite.
(C)Alittlerocket.
(D