In　the　following　essay,　each　blank　has　four　choices.　Choose　the　most　suitable　one　from　the　four　choices　and　write　down　in　the　answer　sheet.　There　are　two　types　of　key　technology:　private　key　and　public　key.　Private　-　key　encryption　methods　are　called(66)ciphers,　information　is　encrypted　with(67)both　the　sender　and　receiver　hold　privately.　Public　-　key　encryption　methods　are　called(68)ciphers,(69)created　for　each　user,　encryption　key　and　decryption　key　ale(70).

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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)