Somekidscan'tsitstillforlong.Theyhaveahardtimepayingattentiontojustonething.They'reeasilydistracted(分神).Theycangetveryimpatient.Theyhatestandinginlineorwaitingfortheirturninagameoractivity.Theyget

　　Somekidscan'tsitstillforlong.Theyhaveahardtimepayingattentiontojustonething.They'reeasilydistracted(分神).Theycangetveryimpatient.Theyhatestandinginlineorwaitingfortheirturninagameoractivity.Theygetboredprettyfast.Theymayalsobeimpulsive—sayingthefirstthingthatcomestomindorinterruptingsomeoneelsewho'stalking.?

　　Forcertainkidsthisproblemissosevere(严重)thatdoctorshaveanameforit:attentiondeficithyperactivitydisorderorADHD.Perhapsasmanyas1outofevery20kidsundertheageof18havecharacteristicsofADHD.Oftenthesekidshavetroublegettingthroughschoolandfaceotherdifficultieslaterinlife.?

　　RizzostarteddevelopingtheVirtualClassroomin1999.Hewantedtoseeifhecoulduseitasatoolfortestingandtreatingkidswhohaveattentiondisorders.?

　　Todiagnose(诊断)ADHDdoctorstypicallytestpatientsbygivingthemtasksthatrequireattention.Aspartofoneclassictestyouwatchlettersflashedonacomputerscreen.Everytimeyouseetheletter“A”followedbytheletter“X”youhavetopressthespacebar.Ifyou'repayingcloseattentionyou'llregisterallthetimesthiscombinationoccurs.Ifnotyou'llmisssome.?

　　TheVirtualClassroommakesthesetestsmoreefficientRizzosays.Inoneexperimenthegaveagroupofkidstheclassic“A-X”test.Insteadoflookingatacomputerscreeninadoctor'sofficethoughthekidsworeheadsetsthatmadeitlookliketheyweretakingthetestinaclassroom.?

　　“Basicallywhatwefound”Rizzosays“isthatin20minutesoftestingwithvirtualreality?we?replicated(复制)afindingthatusuallyrequiresacouplehoursofstandardtestingwithcomputerscreensinthepsychologist'soffice.”?

　　Thefirstparagraphmainlytellsus_______.?

　　A.howtofindapatientwithADHD?

　　B.thebehaviorofsomekidswithADHD?

　　C.kidswithADHDcannotsitstillforalongtime?

　　D.kidswithADHDareeasilydistracted

　　Perhapsasmanyas_______kidshavecharacteristicsofADHD.?

　　A.oneoutofeverytwentykids

　　B.fivepercentkidslessthan18yearsold?

　　C.oneoutoftwentykidsattheageof18

　　D.fivepercentkidsmorethanageof18

　　Intheexperimentpatientsnee