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ÈÕÆÚ:2007-10-18
passage¡¡3
¡¡¡¡¡¡¡¡¡¡american¡¡scientists¡¡have¡¡developed¡¡a¡¡new¡¡kind¡¡of¡¡wire¡¡that¡¡can¡¡carry¡¡telephone¡¡messages¡¡for¡¡long¡¡distances.¡¡the¡¡new¡¡fluoride¡¡glass¡¡wire,¡¡or¡¡optical¡¡fibre,¡¡is¡¡a¡¡major¡¡improvement¡¡over¡¡the¡¡optical¡¡fibres¡¡now¡¡used¡¡in¡¡many¡¡modern¡¡communication¡¡systems.¡¡
¡¡¡¡¡¡¡¡¡¡present¡¡optical¡¡fibres¡¡are¡¡made¡¡from¡¡silica¡¡glass.¡¡they¡¡are¡¡not¡¡costly¡¡to¡¡produce,¡¡but¡¡the¡¡signals¡¡carried¡¡by¡¡these¡¡silica¡¡optical¡¡fibres¡¡weaken¡¡very¡¡quickly.¡¡a¡¡repeater¡¡device¡¡must¡¡be¡¡built¡¡every¡¡50¡¡kilometers¡¡to¡¡increase¡¡or¡¡amplify¡¡the¡¡signals'¡¡strength.¡¡such¡¡repeater¡¡devices¡¡are¡¡costly¡¡and¡¡they¡¡need¡¡electrical¡¡power.¡¡this¡¡creates¡¡special¡¡problems¡¡for¡¡optical¡¡fibre¡¡systems¡¡that¡¡cross¡¡oceans.¡¡long¡¡copper¡¡wires¡¡are¡¡needed¡¡to¡¡carry¡¡electricity¡¡from¡¡shore¡¡to¡¡repeater¡¡devices¡¡under¡¡the¡¡ocean.¡¡repairing¡¡the¡¡underwater¡¡repeaters¡¡is¡¡costly¡¡and¡¡takes¡¡much¡¡time.¡¡
¡¡¡¡¡¡¡¡¡¡the¡¡new¡¡fluoride¡¡optical¡¡fibre¡¡is¡¡only¡¡a¡¡little¡¡bigger¡¡around¡¡than¡¡a¡¡human¡¡hair,¡¡yet¡¡each¡¡could¡¡carry¡¡10,000¡¡telephone¡¡messages¡¡at¡¡one¡¡time¡¡for¡¡thousands¡¡of¡¡kilometers.¡¡traditional¡¡copper¡¡telephone¡¡wires¡¡can¡¡carry¡¡only¡¡4¡¡messages.¡¡and¡¡unlike¡¡present¡¡silica¡¡optical¡¡fibres,¡¡the¡¡new¡¡fluoride¡¡glass¡¡wires¡¡could¡¡carry¡¡messages¡¡for¡¡thousands¡¡of¡¡kilometers¡¡with¡¡very¡¡few,¡¡if¡¡any,¡¡repeater¡¡devices.¡¡
¡¡¡¡¡¡¡¡¡¡the¡¡navy¡¡scientists¡¡developed¡¡the¡¡new¡¡optical¡¡fibres¡¡for¡¡systems¡¡that¡¡cross¡¡oceans,¡¡but¡¡they¡¡said¡¡there¡¡also¡¡would¡¡be¡¡many¡¡other¡¡uses¡¡for¡¡the¡¡fluoride¡¡glass¡¡wires.¡¡the¡¡new¡¡optical¡¡wires¡¡could¡¡be¡¡used¡¡for¡¡long-distance¡¡temperature¡¡sensing¡¡devices.¡¡they¡¡could¡¡be¡¡used¡¡in¡¡some¡¡medical¡¡operations.¡¡
¡¡¡¡¡¡¡¡¡¡scientists¡¡caution¡¡that¡¡the¡¡new¡¡fluoride¡¡optical¡¡fibre¡¡still¡¡is¡¡only¡¡experiment.¡¡researchers¡¡have¡¡not¡¡yet¡¡been¡¡able¡¡to¡¡make¡¡long¡¡tiny¡¡wires¡¡from¡¡fluoride¡¡glass.
31.¡¡which¡¡of¡¡the¡¡following¡¡statements¡¡is¡¡not¡¡true?
¡¡¡¡a.¡¡silica¡¡optical¡¡fibres¡¡are¡¡not¡¡expensive¡¡to¡¡produce.
¡¡¡¡b.¡¡signals¡¡carried¡¡by¡¡silica¡¡optical¡¡fibres¡¡are¡¡rather¡¡weak.
¡¡¡¡c.¡¡additional¡¡devices¡¡are¡¡needed¡¡for¡¡present¡¡optical¡¡fibre/fiber¡¡systems.
¡¡¡¡d.¡¡repeaters¡¡bring¡¡about¡¡special¡¡problems¡¡for¡¡transoceanic¡¡communications.
32.¡¡the¡¡major¡¡advantage¡¡of¡¡fluoride¡¡optical¡¡fibres/fibers¡¡over¡¡silica¡¡wires¡¡is¡¡that¡¡fluoride¡¡glass¡¡.
¡¡¡¡a.¡¡needs¡¡much¡¡fewer,¡¡if¡¡any,¡¡repeaters
¡¡¡¡b.¡¡carries¡¡more¡¡telephone¡¡messages
¡¡¡¡c.¡¡is¡¡less¡¡costly¡¡to¡¡produce
¡¡¡¡d.¡¡is¡¡tinier
33.¡¡the¡¡new¡¡glass¡¡wire¡¡was¡¡designed¡¡for¡¡.¡¡
¡¡¡¡a.¡¡communications¡¡systems¡¡that¡¡cross¡¡oceans
¡¡¡¡b.¡¡long-distance¡¡temperature¡¡sensing¡¡devices
¡¡¡¡c.¡¡some¡¡medical¡¡operations¡¡
¡¡¡¡d.¡¡replacing¡¡silica¡¡optical¡¡fibres¡¡
34.¡¡the¡¡fluoride¡¡optical¡¡fibres¡¡is¡¡experimental¡¡because¡¡the¡¡new¡¡glass¡¡wire¡¡made¡¡so¡¡for¡¡.¡¡
¡¡¡¡a.¡¡is¡¡quite¡¡expensive
¡¡¡¡b.¡¡can¡¡not¡¡yet¡¡carry¡¡enormous¡¡messages
¡¡¡¡c.¡¡still¡¡needs¡¡repeaters
¡¡¡¡d.¡¡is¡¡not¡¡long¡¡enough
35.¡¡the¡¡author's¡¡main¡¡idea¡¡is¡¡that¡¡.¡¡
¡¡¡¡a.¡¡present¡¡optical¡¡fibres¡¡are¡¡made¡¡from¡¡silica¡¡glass
¡¡¡¡b.¡¡silica¡¡optical¡¡fibres¡¡need¡¡repeaters¡¡to¡¡amplify¡¡the¡¡signals¡¡carried
¡¡¡¡c.¡¡american¡¡scientists¡¡have¡¡developed¡¡a¡¡new¡¡glass¡¡wire¡¡to¡¡carry¡¡long-distance¡¡telephone¡¡messages
¡¡¡¡d.¡¡the¡¡new¡¡optical¡¡fiber¡¡had¡¡many¡¡uses
passage¡¡4
¡¡¡¡¡¡¡¡¡¡there¡¡is¡¡no¡¡doubt¡¡that¡¡adults,¡¡and¡¡even¡¡highly¡¡educated¡¡adults,¡¡vary¡¡greatly¡¡in¡¡the¡¡speed¡¡and¡¡efficiency¡¡of¡¡their¡¡reading.¡¡some¡¡proceed¡¡very¡¡slowly¡¡throughout;¡¡others¡¡dash¡¡along¡¡too¡¡quickly¡¡and¡¡then¡¡have¡¡to¡¡regress.¡¡poor¡¡readers¡¡in¡¡particular¡¡may¡¡lack¡¡the¡¡ability¡¡to¡¡vary¡¡their¡¡manner¡¡of¡¡reading¡¡according¡¡to¡¡the¡¡type¡¡of¡¡reading¡¡matter¡¡and¡¡to¡¡their¡¡intentions¡¡in¡¡reading¡¡it.¡¡a¡¡good¡¡reader¡¡can¡¡move¡¡at¡¡great¡¡speed¡¡through¡¡the¡¡text¡¡of¡¡a¡¡novel¡¡or¡¡similar¡¡light¡¡reading¡¡matter.¡¡he¡¡may¡¡be¡¡able¡¡to¡¡skim¡¡a¡¡page,¡¡picking¡¡up¡¡a¡¡word¡¡or¡¡two¡¡here¡¡and¡¡there,¡¡and¡¡gain¡¡a¡¡general¡¡idea¡¡of¡¡what¡¡the¡¡text¡¡is¡¡about¡¡without¡¡really¡¡reading¡¡it.¡¡in¡¡reading¡¡more¡¡difficult¡¡material,¡¡with¡¡the¡¡intention¡¡of¡¡taking¡¡in¡¡the¡¡whole¡¡of¡¡it,¡¡he¡¡will¡¡proceed¡¡more¡¡slowly,¡¡but¡¡even¡¡then¡¡he¡¡will¡¡vary¡¡his¡¡pace,¡¡concentrating¡¡on¡¡the¡¡key¡¡words¡¡and¡¡passages,¡¡perhaps¡¡re-reading¡¡them¡¡several¡¡times¡¡and¡¡pass¡¡more¡¡quickly¡¡over¡¡the¡¡remainder.¡¡a¡¡less¡¡efficient¡¡reader¡¡tends¡¡to¡¡maintain¡¡the¡¡same¡¡speed¡¡whatever¡¡the¡¡material¡¡he¡¡reads.¡¡consequently,¡¡even¡¡light¡¡reading¡¡matter¡¡gives¡¡him¡¡little¡¡pleasure¡¡because¡¡he¡¡reads¡¡so¡¡slowly.¡¡but¡¡this¡¡pace¡¡may¡¡be¡¡too¡¡fast¡¡for¡¡really¡¡difficult¡¡material¡¡which¡¡requires¡¡special¡¡concentration¡¡at¡¡difficult¡¡points.¡¡
a¡¡type¡¡of¡¡reading¡¡which¡¡necessitates¡¡careful¡¡attention¡¡to¡¡detail¡¡is¡¡proofreading,¡¡in¡¡which¡¡the¡¡reader,¡¡in¡¡order¡¡to¡¡detect¡¡misprints¡¡in¡¡a¡¡sample¡¡print,¡¡has¡¡to¡¡notice¡¡not¡¡so¡¡much¡¡the¡¡meaning¡¡of¡¡what¡¡he¡¡reads¡¡as¡¡the¡¡exact¡¡shape¡¡and¡¡order¡¡of¡¡letters¡¡and¡¡words¡¡in¡¡the¡¡text.¡¡this¡¡is¡¡extremely¡¡difficult¡¡for¡¡most¡¡people,¡¡since¡¡they¡¡are¡¡accustomed¡¡to¡¡overlooking¡¡such¡¡details.¡¡in¡¡fact,¡¡considerable¡¡practice¡¡is¡¡required¡¡to¡¡practise¡¡this¡¡task¡¡efficiently¡¡and¡¡it¡¡can¡¡be¡¡done¡¡only¡¡be¡¡reading¡¡very¡¡slowly,¡¡and¡¡by¡¡paying¡¡comparatively¡¡little¡¡attention¡¡to¡¡the¡¡general¡¡meaning¡¡of¡¡the¡¡text.
36.¡¡the¡¡author¡¡claims¡¡that¡¡there¡¡is¡¡a¡¡difference¡¡in¡¡reading¡¡speed¡¡.
¡¡¡¡a.¡¡among¡¡readers¡¡who¡¡have¡¡different¡¡experience.¡¡
¡¡¡¡b.¡¡among¡¡all¡¡the¡¡readers.¡¡
¡¡¡¡c.¡¡between¡¡the¡¡poorly¡¡educated¡¡and¡¡the¡¡highly¡¡educated.¡¡
¡¡¡¡d.¡¡among¡¡the¡¡highly¡¡educated¡¡people¡¡
37.¡¡a¡¡good¡¡reader¡¡is¡¡a¡¡reader¡¡who¡¡.¡¡
¡¡¡¡a.¡¡concentrates¡¡on¡¡the¡¡wonderful¡¡part¡¡of¡¡the¡¡article¡¡
¡¡¡¡b.¡¡always¡¡reads¡¡slowly¡¡and¡¡carefully¡¡
¡¡¡¡c.¡¡changes¡¡his¡¡speed¡¡according¡¡to¡¡the¡¡kind¡¡of¡¡text¡¡
¡¡¡¡d.¡¡changes¡¡his¡¡speed¡¡according¡¡to¡¡the¡¡interesting¡¡of¡¡the¡¡text.
38.¡¡the¡¡author¡¡says¡¡that¡¡when¡¡reading¡¡a¡¡novel,¡¡a¡¡good¡¡reader¡¡can¡¡quickly¡¡read¡¡.¡¡
¡¡¡¡a.¡¡every¡¡part¡¡of¡¡the¡¡book
¡¡¡¡b.¡¡the¡¡most¡¡wonderful¡¡part¡¡in¡¡the¡¡book.¡¡
¡¡¡¡c.¡¡the¡¡major¡¡part¡¡in¡¡the¡¡book¡¡
¡¡¡¡d.¡¡the¡¡scientific¡¡part¡¡of¡¡the¡¡book.¡¡
39.¡¡the¡¡last¡¡two¡¡sentences¡¡of¡¡the¡¡first¡¡paragraph¡¡mean¡¡that¡¡.¡¡
¡¡¡¡a.¡¡a¡¡reading¡¡speed¡¡too¡¡slow¡¡for¡¡a¡¡difficult¡¡book¡¡is¡¡just¡¡right¡¡for¡¡a¡¡non-serious¡¡one.¡¡
¡¡¡¡b.¡¡a¡¡reading¡¡speed¡¡too¡¡slow¡¡for¡¡a¡¡non-serious¡¡book¡¡may¡¡be¡¡too¡¡fast¡¡for¡¡a¡¡difficult¡¡one.¡¡
¡¡¡¡c.¡¡a¡¡reading¡¡speed¡¡too¡¡fast¡¡for¡¡difficult¡¡material¡¡is¡¡just¡¡right¡¡for¡¡a¡¡non-serious¡¡book¡¡is¡¡also¡¡too¡¡slow¡¡for¡¡a¡¡difficult¡¡one.¡¡
¡¡¡¡d.¡¡a¡¡reading¡¡speed¡¡too¡¡slow¡¡for¡¡a¡¡non-serious¡¡book¡¡is¡¡also¡¡too¡¡slow¡¡for¡¡a¡¡difficult¡¡one.¡¡
40.¡¡which¡¡of¡¡the¡¡following¡¡can¡¡be¡¡the¡¡title¡¡of¡¡the¡¡passage?
¡¡¡¡a.¡¡reading¡¡and¡¡listening¡¡
¡¡¡¡b.¡¡difference¡¡between¡¡highly-educated¡¡and¡¡poorly¡¡educated¡¡
¡¡¡¡c.¡¡practice¡¡reading¡¡skill
¡¡¡¡d.¡¡difference¡¡in¡¡the¡¡speed¡¡and¡¡efficiency¡¡of¡¡reading
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