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Milan,thesecondlargestcityofItaly,haswonanundesirableworldrecord.Ofthe54bigcitiesstudiedbytheWorldHealthOrganizationandtheUnitedNations,Milanwasconsideredtohavetheworstairpollution.

Accordingtothesetwo10-yearstudies,thelevelofairpollutioninMilanistwiceashighasthelevelsinParisandBeijingandthreetimesthoseinTokyoandLondon,andfourtimesthatinNewYork.ThereasonforMilan’sbadpollution,tosomeexperts,isthatthecityliesinavalleythatholdsbackthepoisonous(有毒的)gases.

ThoughMilanhastakensomemeasurestolowerthelevelofpollution,thesituationisstillworrying.Peoplejoketoeachother,“Ifyou’retravelingtoMilan,besuretobringyourgasmask(面具).”

Inordertoreducetheuseifprivatecarsin1979,theMilanbegananinterestingexperiment:Passengersinthecitybusesdidn’thavetopayfortheirtickets.

1.WhichisNOTmentionedinthepassage?

A.ThereasonfortheairpollutioninMilan.

B.ExpertsthoughtthattheairinMilanwasbadlypolluted.

C.Milan’swaterisregardedtobeworstpolluted.

D.ThemeasurestakenbyMilantoreducetheairpollution.

2.Whichofthefollowingcitieskeepsthelowestlevelofairpollution?

A.LondonB.TokyoC.ParisD.NewYork

3.WhyistheairpollutioninMilansoserious?

A.Becausethecityliesinaplacewhereitisdifficultforpollutedairtomove

away.

B.Becausetoomanycarsarebeingdriveninthecity.

C.Becausethecityliesinaplacewheretherearesomemountainsnearit.

D.BecauseMilanhastakensomeworryingmeasures

4.Accordingtothepassage,whichofthefollowingisTRUE?

A.Milanhastakensomemeasuresandtheairpollutionisbeingreduced.

B.Milanhastakensomemeasures,buttheairpollutionisstilltroublesome.

C.Milanhastakennomeasuressofartolowerthelevelofpollution.

D.Milanhastakeneverysteptoreducetheairpollution.

5.ThegovernmentofMilanencouragedthepeopletotakecitybusesforfreeinorderto______.

A.haveasafertransportB.stoptheairpollutioncompletely

C.