Agreenlightmeanstrafficismovingforty-fivemilesanhouryellowmeansthirtytoforty-fivemilesanhourandredmeansheavytraffic-carsstandingstillormovinglessthanthirtymilesanhour.
“SeethatredlightnearAustinAvenue(大道)？”thecontrolleraskedavisitor.“There’sarepairtruckfixingtheroadandthetraffichastogoaroundit.”
AttheRooseveltRoadentrancetotheexpresswaythelightkeptchangingfromgreentoredandbacktogreenagain.“Alotoftrucksgetontheexpresswaythere.”thecontrollerexplained.“Theycan’tspeedupasfastascars.”
Thesensors(传感器)showimmediatelywhereanaccidentorastoppedcarisblockingtrafficandatruckissentbyradiotocleartheroad.Thesystemhasloweredthenumberofaccidentsby18percent.Therearenow1.4deathsonChicago’sexpresswaysforeachonehundredmillionmilestraveledwhileinotherpartsofthecountrythereare2.6
TrafficexpertssaythattheChicagosystemisthe“comingthing”.SystemslikeChicago’sarealreadyinuseonsomeexpresswaysinLosAngelesandHouston.“Chicagohastakenthelead.”saysNewYorkCity’strafficdirector;andheadds“wearefarbeing…”
1.Whatwouldbethebesttitleforthistext?
A.ComputerizedTrafficControlSystemB.RushPeriodsGettingLonger
C.TheNation’sBusiestRoadD.SensorsonExpressways
2.HowdoesthecontrollerfollowChicago’straffic?
A.Bylearninghowtouseacomputer.
B.Bywaitingfortheredlighttoturntogreen.
C.Bywatchingthesensorsbuiltintoexpressways.
D.Bylookingatasetoflightsonthemapinthecontrolroom.
3.Theunderlinedword“it”inthepassagerefersto .
A.atruckwhichneedsrepairing B.atruckdoingrepairsontheroad
C.AustinAvenue D.aredlight
4.ThesysteminChicago .
A.isreallyeffective B.isactuallyofverylittleuse
C.willbesenttoLosAngelesD.islookeddownuponbyNewYork’strafficdirector