题目内容：
Questionsarebasedonthefollowingpassage:
Byadoptingafewsimpletechniques,parentswhoreadtotheirchildrencangreatlyincreasetheirchildren'slanguagedevelopment.Itissurprisingbuttrue.Howparentstalktotheirchildrenmakesabigdifferenceinthechildren'slanguagedevelopment.Ifaparentencouragesthechildtoactivelyrespondtowhattheparentisreading,thechild'slanguageskillsincrease.
Astudywasdonewith30three-year-oldchildrenandtheirparents.Halfofthechildrenparticipatedintheexperimentalstudy;theotherhalfactedasthecontrolgroup.Intheexperimentalgroup,theparentsweregivenatwo-hourtrainingsessioninwhichtheyweretaughttoaskopenendedquestionsratherthanyes-or-noquestions.Forexample,theparentshouldask,"Whatisthedoggiedoing?"ratherthan"Isthedoggierunningaway?"Theparentsintheexperimentalgroupwerealsoinstructedinhowtohelpchildrenfindanswers,howtosuggestalternativepossibilitiesandhowtopraisecorrectanswers.
Atthebeginningofthestudy,thechildrendidnotdifferinmeasuresoflanguagedevelopment,butattheendofonemonth,thechildrenintheexperimentalgroupshowed5.5monthsaheadofthecontrolgrouponatestofverbalexpressionandvocabulary.Ninemonthslater,thechildrenintheexperimentalgroupstillshowedanadvanceof6monthsoverthechildreninthecontrolgroup.
Whichofthefollowingcanbeinferredfromthepassage? A．Childrenwhotalkalotaremoreintelligent
B．Parentswholistentotheirchildrencanteachthemmore
C．Activechildrenshouldreadmoreandbegivenmoreattention
D．Verbalabilitycaneasilybedevelopedwithpropermethods
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答案解析：