题目内容：
请根据以下内容回答题：Grown-upsareoftensurprisedbyhowwelltheyremembersomethingtheylearnedaschildrenbuthaveneverpracticedeversince.Amanwhohasnothadachancetogoswimmingforyearscanstillswimaswellaseverwhenhegetsbackinthewater.Hecangetonabicycleaftermanyyearsandstillrideaway.Hecanplaycatchandhitaballaswellashisson.Amotherwhohasnotthoughtaboutthewordsforyearscanteachherdaughterthepoemthatbegins"Twinkle,twinkle,littlestar"orrememberthestoryofCinderellaorGoldilocksandtheThreeBears.
Oneexplanationisthelawofoverlearning,whichcanbestatedasfollows:Oncewehavelearnedsomething,additionallearningtrialsincreasethelengthoftimewewillRememberitInchildhoodweusuallycontinuetopracticesuchskillsasswimming,bicycleriding,andplayingbaseballlongafterwehavelearnedthem.Wecontinuetolistentoandremindourselvesofwordssuchas"Twinkle,twinkle,littlestar"andchildhoodtalessuchasCinderellaandGoldilocks.Wenotonlylearnbutoverlearn.
Themultiplicationtables(乘法口诀表)areanexceptiontothegeneralrule.thatweforgetratherquicklythethingsthatwelearninschool,becausetheyareanotherofthethingsweoverlearninchildhood.
::ThelawofoverleatningexplainswhycrammingJ(突击学习)foranexamination,thoughitmayresultinapassinggrade,isnotasatisfactorywaytolearnacollegecourse.Bycramming,astudentmaylearnthesubjectwellenoughtogetbyontheexamination,butheislikelysoontoforgetalmosteverythinghelearned.Alittleoverlearning,ontheotherhand,isreallynecessaryforone'sfuturedevelopment.
What‘themainideaofParagraph1_____ A．Peoplerememberwellwhattheylearnedinchildhoo
B．Childrenhaveabettermemorythangrown-up
C．Poemreadingisagoodwaytolearnword“
D．Storiesforchildrenareeasytoremembe
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