since january 2013, many cities in china have seen a lot of foggy days.阅读理解答案

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1、SinceJanuary2013,manycitiesinChinahaveseenalotoffoggydays.阅读理解答案　　SinceJanuary2013,manycitiesinChinahaveseenalotoffoggydays.InBeijing,onlyfivedaysinJanuarywerefreeofsmog(雾霾).What’sthedifferencebetweenfogandsmog?　　Accordingtoscientists,fogismadeupoftiny(微小的)dropsofwaterandalsoicepa

2、rticles(颗粒)duringverycoldconditions.Smogisdirtyairthatlookslikeamixtureofsmokeandfog,causedmainlybysmokefromcarsandfactoriesincities.　　AnofficialfortheMinistryofEnvironmentalProtectiontoldBeijingNewsthatpollutionisthemainproblemwithairpollution.PMreferstopollutionwithsmallparticle

3、smicrometersorlessindiameter(直径).　　AccordingtotheChineseAcademyofSciences,twomainfactorsthatcausePMaremotorvehiclesandtheburningofcoal.　　Poorairhasdoneharmtopeople’shealth.Childrenandtheelderlyaremoreatrisk.AreportfromBeijingChildren’sHospitalshowsthatfromJanuary5toJanuary11,2013,

4、halfofthepa　　　　tientsinthehospitalcameforrespiratory(呼吸道的)problems.　　Torespondtotheairproblem,theChinesegovernmentandmanyChinesepeoplehavestartedtotakeaction.　　Beijingannouncedaplantousecleanfuelingovernmentvehiclesandplanttrees.ItaskedcitizenstosetofffewerfireworksfortheSpringFes

5、tivalcelebration.Theysuggestedthatcarswithlargeemissions(排放)shouldbebannedandfactoriesshouldbecloselywatched.　　ThreestudentsfromNo.4HighSchoolinBeijingwroteareporttoadvisetofighttheairpollution.“Wehopemorepeoplewilljoinustoprotectourenvironment.Withallourefforts,theblueskieswillce

6、rtainlyreturnsoon,”saidShiYucong,15,oneofthethreestudents.　　1.Theunderlinedphrase“werefreeof”means____________.　　A.hadsomeB.hadmany 　　　　;C.hadnoD.hadmoreandmore　　2.Accordingtothesecondparagraph,wecanknow____________.　　A.smogisamixtureoffogandsmokeB.smogisformed(形成)duringcoldho

7、urs　　C.fogismadeupofdropsofwaterwithsmokeD.smokefromcarsandfactoriescausefog　　3.Paragraphs3and4aremainlyabout____________.　　A.whatPMisandwhatcausesPM　　B.howtopreventPMpollutionandhowPMlooks　　C.whatPMisandhowtoprotectourselvesagainstPM　　D.howseriouslyPMaffectsusandhowtodealwithPM　　

8、4.Whatisthebesttitleforthepassage