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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?

C.Milan’swaterisregardedtobeworstpolluted.

2.Whichofthefollowingcitieskeepsthelowestlevelofairpollution?

D.NewYork

3.WhyistheairpollutioninMilansoserious?

A.Becausethecityliesinaplacewhereitisdifficultforpollutedairtomove

away.

4.Accordingtothepassage,whichofthefollowingisTRUE?

B.Milanhastakensomemeasures,buttheairpollutionisstilltroublesome.

5.ThegovernmentofMilanencouragedthepeopletotakecitybusesforfreeinorderto______.

D.reducethepollutionmadebycars