阅读理解专题卷19Somekidscan'tsitstillforlong.Theyhaveahardtimepayingattentiontojustonething.They'reeasilydistracted(分神).Theycangetveryimpatient.Theyhatestandinginlineorwaitingfortheirturninagameoractivity.Theygetboredprettyfast.Theymayalsobeimpulsive—sayingthefirstthingthatcomestomindorinterruptingsomeoneelsewho'stalking.Forcertainkids,thisproblemissosevere(严重)thatdoctorshaveanameforit:attentiondeficithyperactivitydisorder,orADHD.Perhapsasmanyas1outofevery20kidsundertheageof18havecharacteristicsofADHD.Often,thesekidshavetroublegettingthroughschoolandfaceotherdifficultieslaterinlife.RizzostarteddevelopingtheVirtualClassroomin1999.Hewantedtoseeifhecoulduseitasatoolfortestingandtreatingkidswhohaveattentiondisorders.Todiagnose(诊断)ADHD,doctorstypicallytestpatientsbygivingthemtasksthatrequireattention.Aspartofoneclassictest,youwatchlettersflashedonacomputerscreen.Everytimeyouseetheletter“A”followedbytheletter“X”,youhavetopressthespacebar.Ifyou'repayingcloseattention,you'llregisterallthetimesthiscombinationoccurs.Ifnot,you'llmisssome.TheVirtualClassroommakesthesetestsmoreefficient,Rizzosays.Inoneexperiment,hegaveagroupofkidstheclassic“A-X”test.Insteadoflookingatacomputerscreeninadoctor'soffice,though,thekidsworeheadsetsthatmadeitlookliketheyweretakingthetestinaclassroom.“Basicallywhatwefound,”Rizzosays,“isthat,in20minutesoftestingwithvirtualreality,wereplicated(复制)afindingthatusuallyrequiresacouplehoursofstandardtestingwithcomputerscreensinthepsychologist'soffice.”1．Thefirstparagraphmainlytellsus_______.A.howtofindapatientwithADHDB.thebehaviorofsomekidswithADHDC.kidswithADHDcannotsitstillforalongtimeD.kidswithADHDareeasilydistracted2．Perhapsasmanyas_______kidshavecharacteristicsofADHD.A.oneoutofeverytwentykidsB.fivepercentkidslessthan18yearsoldC.oneoutoftwentykidsattheageof18D.fivepercentkidsmorethanageof183．Intheexperiment,patientsneedtopressthespacebar,when_______.A.seelettersAfollowingXB.firstseeAthenseeBC.seeletterXandAD.seelettersAfollowe