题目内容：
Questionsarebasedonthefollowingpassage:Attention-deficitdisorder(ADD)happenswithabout5%ofchildreninschool.Thesechildrenshowsignsofnotpayingattentionordoingthingswithoutthinkingfirst.Theymaynotbeabletofollowmorethanonedirectionatatime.Theiractionscanbequickandtheytalkliketheyareinahurry.Doingthesethingsiscalled“beinghyperactive.”ManyofthechildrenwhoarelookedatforADDseemhyperactive.Theytendtobotherotherstudentsatthewrongtimes.SometimesachildwithADDislabeledaslazy,excited,oratroublemaker.Manytimestheproblemisnottheirfaultandtheycannotcontrolit.AbouthalfofthechildrenwithADDusuallystoptheirADDbehaviorbythetimetheybecomeanadult.ThosethatdonotlosetheirADDbehaviorcontinuetohaveahardtimestayingononetaskforverylong.Therearemanyreasonswhyapersonmayhaveahardtimefocusingonataskforverylong.Adoctorwillneedtoseeorhearabouthowthepersonactsinalotofdifferentplaces.Themedicalhistoryofthepersonisimportant,too.ThereareteststhatcanbegiventohelpinseeingifthepersonhasADD.SometimesmedicinecanhelpapersonwithADD.Itcanhelpthepersontofocusonatasklongerandtocutdownonrespondingtodistractions.ThemedicinemustbegivenbyadoctorandthepersonwithADDcarefullywatchedtoseeifthemedicineishelping.
WhichofthefollowingisNOTasignofADDchildren? A．Notfocusingonwhattheyaredoin
B．Talkingliketheyareinahurr
C．Thinkingtwicebeforetakingactio
D．Followingonedirectionatatim
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答案解析：