某单位为了扩展局域网新买了一个有3个端口的网桥，扩展后网桥的连接如图10-2所示，端口1与网段A相连，端口2与网段B相连，端口3与网段C相连，网段A中的主机H1的MAC地址是MAC1，网段C中的主机H2的MAC地址是MAC2。则该网桥在工作的过程中，下列说法中正确的一项是(50)。

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For　each　blank,　choose　the　best　answer　from　the　four　choices　and　write　down　on　the　answer　sheet.　Web　browser　is　simply　a　terminal　emulator,　designed　to　display　text　on　a　screen.　The　two　essential　differences　between　an　ordinary　terminal　emulator　and　a　Web　browser　are　that　the　browser　knows　how　to　deal　with(71),　and　that　it　has　a　mechanism　for(72)graphical　fries.　Display　text,　display　graphics,　and(73)hyperlinks-there'　s　99　percent　of　the(74)value.　That's　not　to　say　that　the　manufacturers　didn't　go　all-out　to　attach　a　hyperactive　efflorescence　of　useless　capabilities　onto　their　browsers.　Remember　when　media　channels　in　the　browser　were　a　big　deal,　instead　of　the　clutter　you　can't　wait　to　delete　from　your　favorites　of　bookmarks　menu?　Remember　when　client　-　side　Java　applets　were　supposed　to　become　the　preferred(75)for　application　development?　Remember　frames　and　all　their　nasty　side　effects?

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In　a　data　warehouse　environmem,　data　is　only　valuable　when　it　is　organized　and　displayed　as(75)