题目内容：
Questionsarebasedonthefollowingpassage
Televisionbroadcastsare(1)toanareathatiswithinthe(2)ofthesendingstationoritsrelay(中转站).(3)televisionrelaysareoftenplacedonhillsandmountainssothattheycan(4)awiderregion,theystillcannotcovermorelandthanonefromthehilltop(5)acleardayHowever,theraysalsogooutintotheatmosphere,(6)thereisarelaystationonasatellitethat(7)aroundtheearth,itcansendthepicturestoanypointontheearthfromwhichthesatelliteis(8).Threesatellites(9)turningaroundovertheequator(赤道)sendanytelevisionprogramtoanypartoftheearth.(10)makesitpossibleforworld(11)ofnewspapertogivethenewsinallcountriesatthesametime.(12)itmaybepossibleforasubscriber(订户)toatelevisednewspaperto(13)abuttonandseeanewspaperpage(14)histelevisionscreen.Hecouldalsodecidewhenhewantsthepage(15),(16),bydialingdifferentnumbersuchas(17)onatelephonedial,hecouldchoosethelanguageorthe,editionofthepaperhewantstoread.
Itseemsstrangetothinkthat,eventoday,methodsofthe(15)arenotentirelyuseless.Forexample,sometimes(19)agencieswhichuseradioandTelstaralsousepigeonsto(20)messagesbetweenofficesinlargecitiesbecausethepigeonsarenotbotheredbytragicproblems.
第（1）题选 A．prohibited
B．bounded
C．Limited
D．shifted
参考答案：
答案解析：