五.任务型阅读
Couldyourcellphonegiveyoucancer?Whetheritcouldornotsomepeopleareworryingaboutthepossibilitythatphonespowerlinesandwi-fi(路由器)couldberesponsibleforarangeofillnessesfromrashestobraintumours.
ForexampleCamillaRees48aformerinvestmentbankerintheUSmovedoutofherapartmentinSanFranciscobecauseoftheradiationcomingfromnextdoor.ReestoldtheLosAngelesTimesthatwhenherneighborsmovedinandinstalledawi-firoutershelostherabilitytothinkclearly.“Iwouldwakeupdizzyinthemorning.I’dfalltothefloor.Ihadtoleavetoescapethatnightmare”shesaid.Sincethenshe’sbeenonacampaignagainstlow-levelelectromagneticfieldsorEMFs（低频电磁场）.
Andshe’snotalone.Millionsofpeoplesaytheysufferfromheadachesdepressionnauseaandrasheswhenthey’retooclosetocellphonesorothersourcesofEMFs.
AlthoughtheWorldHealthOrganizationhasofficiallydeclaredthatEMFsseemtoposelittlethreatgovernmentsarestillconcerned.InfactlastApriltheEuropeanParliamentcalledforcountriestotakestepstoreduceexposuretoEMFs.ThecityofSanFranciscoandthestateofMainearecurrentlyconsideringrequiringcancer-warninglabelsoncellphones.
Ifthesefearsarereasonablethenperhapsweshouldallbeworriedabouttheamountoftimewespendtalkingonourphonesorpluggingintowi-fihotpots.
Somesaythereisevidencetosupportthegrowinganxieties.DavidCarpenteraprofessorofenvironmentalhealthsciencesattheUniversityatAlbanyinNewYorkthinksthere’sagreaterthan95%chancethatpowerlinescancausechildhoodleukemia.Alsothere’sagreaterthan90%chancethatcellphonescancausebraintumours.
Butothersbelievetheseconcernsareunreasonableparanoia(猜疑).DrMarthaLinettheheadofradiationepidemiologyattheUSNationalCancerInstitutehaslookedatthesameresearchasCarpenterbuthasreachedadifferentconclusion.“Idon’tsupportwarninglabelsforcellphones”saidLinet.“Wedon'thavetheevidencethatthere’smuchdanger.”
StudiessofarsuggestaweakconnectionbetweenEMFsandillness—soweakthatitmightnotexistatall.Amultinationalinvestigationofcellphonesandbraincancerin13countriesoutsidetheUShas