D

Holdingacellphoneagainstyourearorstoringitinyourpocketmaybedangeroustoyourhealth.Thisexplainsawarningthatcellphonemanufacturersincludeinthesmallprintthatisoftenignoredwhenanewphoneispurchased.Appleforexampledoesn’twantiPhonestocomeclosertoyouthan1.5centimeters;ResearchInMotionBlackBerry’smanufacturerrecommends2.5centimeters.

Ifhealthissuesarisefromcellphoneusethepossibleeffectsarehuge.Voicecalls-Americanschatoncellphones2.26trillion(万亿)minutesannually-earn$109billionforthewirelesscarriers.

DevraDavisanexpertwhohasworkedfortheUniversityofPittsburghhaspublishedabookaboutcellphoneradiation“Disconnect.”Thebooksurveysscientificresearchandconcludesthequestionisnotsettled.

BraincancerisaconcernthatMs.Davisexamines.Overalltherehasnotbeenanincreaseinitsincidencesincecellphonesarrived.Buttheaveragemasksanincreaseinbraincancerinthe20-to-29agegroupandadropfortheolderpopulation.

“Mostcancershavemultiplecauses”shesaysbutshepointstolaboratoryresearchthatsuggestslow-energyradiationcoulddamagecellsthatcouldpossiblyleadtocancer.

ChildrenaremorevulnerabletoradiationthanadultsMs.Davisandotherscientistspointout.Radiationthatpenetratesonlyfivecentimetersintothebrainofanadultwillreachmuchdeeperintothebrainsofchildrenbecausetheirskullsarethinnerandtheirbrainscontainmoreabsorptivefluid（易吸收的液体）.Nostudieshaveyetbeencompletedoncellphoneradiationandchildrenshesays.

HenryLaiaresearchprofessorinthebioengineeringdepartmentattheUniversityofWashingtonbeganlaboratoryradiationstudiesin1980andfoundthatratsexposedtoradiationhaddamagedDNAintheirbrains.

Ms.Davisrecommendsusingwiredheadsetsorthephone’sspeaker.Childrenshouldtextratherthancallshesaidandpregnantwomenshouldkeepphonesawayfromtheabdomen（腹部）.

【小题1】Whyisthewarninginthesmallprint?

A．Theythinkpeoplewillnotcareaboutit.B．Thereisnotenoughspaceforthewarning.C．Theydon’twanttheuserstopayattentiontoit.