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萤石化渣作用快,且不降低炉渣碱度,不影响炉龄

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Inthissectiontherearefourpassagesfollowedbyquestionsorunfinishedstatements,eachwithfoursuggestedanswersmarkedA,B,CandD.Choosetheonethatyouthinkisthebestanswer.

TEXTA

Racket,dinclamor,noise,whateveryouwanttocallit,unwantedsoundisAmerica'smostwidespread

nuisance.Butnoiseismorethanjustanuisance.Itconstitutesarealandpresentdangertopeople'shealth.Day

andnight,athome,atwork,andatplay,noisecanproduceseriousphysicalandpsychologicalstress.Nooneis

immunetothisstress.Thoughweseemtoadjusttonoisebyignoringit,theear,infact,neverclosesandthe

bodystillresponds—sometimeswithextremetension,astoastrangesoundinthenight.

Theannoyancewefeelwhenfacedwithnoiseisthemostcommonoutwardsymptomofthestressbuilding

upinsideus.Indeed,becauseirritabilityissoapparent,legislatorshavemadepublicannoyancethebasisof

manynoiseabatementprograms.Themoresubtleandmoreserioushealthhazardsassociatedwithstress

causedbynoisetraditionallyhavebeengivenmuchlessattention.Nevertheless,whenweareannoyedormade

irritablebynoise,weshouldconsiderthesesymptomsfairwarningthatotherthingmaybehappeningtous,

someofwhichmaybedamagingtoourhealth.

Ofmanyhealthhazardstonoise,hearinglossisthemostclearlyobservableandmeasurablebyhealth

professionals.Theotherhazardsarehardertopindown.Formanyofus,theremaybeariskthatexposuretothe

stressofnoiseincreasessusceptibilitytodiseaseandinfection.Themoresusceptibleamongusmayexperience

noiseasacomplicatingfactorinheartproblemsandotherdiseases.Noisethatcausesannoyanceandirritability

inhealthpersonsmayhaveseriousconsequencesforthesealreadyillinmindorbody.

Noiseaffectsusthroughoutourlives.Forexample,thereareindicationsofeffectsontheunbornchildwhen

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hearinglossasonlyanoccupationalhazard.

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A.unaffectedby

B.hurtby

C.unlikelytobeseenby

D.unknownby

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A.unrealistic

B.traditional

C.concerned

D.hysterical

3.Whichofthefollowingbeststatesthemainideaofthepassage?

A.Noiseisamajorproblem;mostpeoplerecognizeitsimportance.

B.Althoughnoisecanbeannoying,itisnotamajorproblem.

C.Noiseisamajorproblemandhasnotyetbeenrecognizedassuch.

D.Noiseisamajorproblemaboutwhichnothingcanbedone.

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A.isagainstthelaw

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C.isanuisance

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C.awasteofmoney

D.essential

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