题目内容：
根据以下材料，回答题HumanintelligenceandtheIQscalesusedtomeasureitonceagainarebecomingthefocusoffierydebate.
Asargumentragesoverdecliningtestscoresinthenation'sschools,anoldbutexplosiveissueisreappearing;Whatisintelligence-andisitdeterminedlargelybygenetics?
ThecontroversyeruptedmorethanadecadeagowhensomeU.S.scholarssawaracialpatterninthedifferingscoresofstudentstakingintelligenceandcollege-entrancetests.
Now,theracialissueisbeingjoinedbyothers.Teachers,psychologists,scientistsandlawyersargueoverthequestionofwhetherIQ-intelligencequotient-testsactuallymeasurementalability,oriffindingsareskewedbysuchfactorsasfamilybackground,povertyandemotionaldisorders.Moreover,someauthoritiesassertthattheriseinthenumberofcollegeeducatedAmericansandtheirtendencytomarryamongthemselvesarecreatingaclassofsupersmartchildrenofbrainyparents-and,ontheothersideofthescale,alumpenproletariatofchildrenreflectingthesuppos-edlyinferiorbrainpoweroftheirparents.
CriticssuchasHarvardUniversitybiologistRichardC.Lewontindisagree.Ifmentalabilitywerelargelydeterminedbyinheritance,hesays,effortstoenhanceintelligencethroughthebetter-mentofbothhomeandchild-rearingenvironmentscouldonlybemarginallyeffective.Hecomments:
"Geneticdeterminismcouldbeusedtojustifyexistingsocialinjusticeaspredeterminedandinevitableandwouldrendereffortsmadetowardequalitariangoalsasuseless."
SupportingLewontininthisisJ.McVickerHunt,aprofessorattheUniversityofminois,whomaintainsthatIQlevelscanberaisedsignificantlybyexposingchildrenatanearlyagetostimula-tingenvironments.Hunt'sstudiesshowthatearlyhelpinsuchareasaseducationandnutritioncanraiseachild'sIQbyanaverageof30to35points.
AtstakeintheuproaroverIQisthenationalcommitmenttoimprovethecapabilitiesofthepoorbyinvestingbillionsofdollarsannuallyineducational,medicalandjobprograms.
ThecontroversyoverIQtestsisreappearingbecauseof A．thenewlyfoundracialpattemunderlyingstudents’performance.
B．theworseningstudents’performanceintheirstudies.
C．thelong—standingdivisioninthedefinitionofintelligence.
D．thedubiousIQscalesusedtomeasureintelligence.
参考答案：
答案解析：