(69) A.ISDN

　　B.x.25

　　C.Frame Relay

　　D.ATM

　　(70) A.HTTP

　　B.URL

　　C.HTML

　　D.TAG

　　●Network managers have long awaited practical voice-over�睮P(VOIP)solutions.VOIP promises(71)network management and decreases costs by(72)a company's telephony and data infrastructures into one network.And a VOIP solution implemented at a company's head-quarters with far-reaching branch offices can(73)tremendous amounts of(74)in long distance phone bills，provided that solution delivers POTS-like voice(75)over the Internet.

　　(71)A.complicated B.useful C.ease D.orderly

　　(72)A.converging B.dividing C.combine D.bringing

　　(73)A.get B.put C.save D.waste

　　(74)A.cash B.money C.space D.time

　　(75)A.qualtity B.quality C.volune D.speed

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