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1、2009.12PassageOneQuestions52to56arebasedonthefollowingpassage.Thereisnothinglikethesuggestionofacancerrisktoscareaparent,especiallyoneoftheover-educated,eco-conscioustype.SoyoucanimaginethereactionwhenarecentUSATodayinvestigationofairqualityaroundthe
2、nation’sschoolssingledoutthoseinthesmugly（自鸣得意的）greenvillageofBerkeley,Calif.,asbeingamongtheworstinthecountry.Thecity’spublichighschool,aswellasanumberofdaycarecenters,preschools,elementaryandmiddleschools,fellinthelowest10%.Industrialpollutioninour
3、townhadsupposedlyturnedstudentsintolivingscienceexperimentsbreathinginalaboratory’sworthofheavymetalslikemanganese,chromiumandnickeleachday.Thisinacitythatrequiresschoolcafeteriastoserveorganicmeals.Great,Ithought,organiclunch,toxiccampus.SinceDecemb
4、er,whenthereportcameout,themayor,neighborhoodactivists（活跃分子）andvariousparent-teacherassociationshaveengagedinafiercebattleoveritsvalidity:overtheguiltofthesteel-castingfactoryonthewesternedgeoftown,overunionjobsversuschildren’shealthandoverwhat,ifany
5、thing,oughttobedone.Withallsidespresentingtheirownexpertsarmedwithconflictingscientificstudies,whomshouldparentsbelieve?Istheretrulyathreathere,weaskedoneanotheraswedroppedoffourkids,andifso,howgreatisit?Andhowdoesitcomparewiththeother,seemingly52009
6、.12perpetualhealthscaresweconfront,likepanicoverleadinsyntheticathleticfields?Ratherthanjustanotherweirdepisodeinthetownthatbroughtyouprotestingenvironmentalists,thislatestdramaisatrialforhowtoday’sparentsperceiverisk,howwetrytokeepourkidssafe—whethe
7、rit’spossibletokeepthemsafe—inwhatfeelslikeanincreasinglythreateningworld.Itraisesthequestionofwhat,inourtime,“safe”couldevenmean.“There’snowayaroundtheuncertainty,”saysKimberlyThompson,presidentofKidRisk,anonprofitgroupthatstudieschildren’shealth.“T
8、hatmeansyourchoicescanmatter,butitalsomeansyouaren’tgoingtoknowiftheydo.”A2004reportinthejournalPediatricsexplainedthatnervousparentshavemoretofearfromfire,caraccidentsanddrowningthanfromtoxicchemicalexposure.TowhichIsay:Well,obviously.Butsuchconcret
