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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

司凤山回答:
  答案:A;C;B;A提示:1.阅读全文,通过红黄绿灯的频繁交替更换以控制车速、路障的迅速清除及车祸数量的降低,可得知这都是电脑化的交通控制系统的发挥作用。2.通过阅读第四段的头一句可知答案。3....
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