题目内容：
根据以下材料，回答题TheintelligencetestusedmostoftentodayarebasedontheworkofaFrenchman，AlfredBinet．Inl905，BinetWasaskedbytheFrenchMinistryofEducationtodevelopawaytoidentifythosechildtIinFrenchschoolswhoweretoo“mentallydeficient(不足的)”tobenefitfromordinaryschoolingandwhoneededspecialeducation．Thetestshadtodistinguishthosewhoweremerelybehindinschoodfromthosewhowereactuallymentallydeficient．
TheitemsthatBinetandhiscolleagueTheophileSimonincludedonthetestwerechosenonthebasisoftheirideasaboutintelligence．BinetandSimonbelievedintelligenceincludessuchabilitiesasunderstandingthemeaningofwords；solvingproblems，andmakingcommonsensejudgements.TwootherimportantassumptionsalsoshapedBinet’sandSimon’swork：(1)thatchildrenwithmoreintelligencewilldobetterinschooland(2)thatolderchildrenhaveagreaterabilitythanyoungerchildren．
Binet’Sfirsttestconsistedoft}lirtytasks．Theyweresimplethingsmostchildrenlearnasaresultoftheireverydayexperiences．Thetaskswerearrangedingroups．accordingtoage．Binetdecidedwhichtaskswereappropriateforagivenagegroupbygivingthemfirsttoalargenumberofchildrenofdifferentages．Ifmorethanhalfofthechildrenofagivenagepassedatest，itwasconsideredappropriateforthatagegroup.
Themainpurposeofthispassageisto． A．telltheoriginofintelligencetests
B．explainthebasicprincipleofintelligencetests
C．describethechangesinthecontentofintelligencetests
D．statethedevelopmentofintelligencetests
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答案解析：