题目内容：
Questionsarebasedonthefollowingpassage: Howmenfirstlearnedtoinventwordsisunknown;inotherwords,theoriginoflanguageisamystery．Allwereallyknowisthatmen,unlikeanimals,somehowinventedcertainsoundstoexpressthoughtsandfeelings,actionsandthings,sothattheycouldcommunicatewitheachother;andthatlatertheyagreeduponcertainsigns,calledletters,whichcouldbecombinedtorepresentthosesounds,andwhichcouldbewrittendown．Thosesounds,whetherspoken,orwritteninletterswecallwords．
Thepowerofwords,then,liesintheircombinations--thethingstheybringupbeforeourminds．
Wordsbecomefilledwithmeaningforusbyexperience;andthelongerwelive,themorecertainwordsrecalltousthegladandsadeventsofourpast;andthemorewereadandlearn,themorethenumberofwordsthatmeansomethingtousincreases．
Greatwritersarethosewhonotonlyhavegreatthoughts,butalsoexpressthesethoughtsinwordswhichappealpowerfullytoourmindsandfeelings．Thischarmingandtellinguseofwordsiswhatwecallliterary(文字的)style．Aboveall,therealpoetisamasterofwords．Hecanconveyhismeaninginwordswhichsinglikemusic,andwhichbytheirpositionandassociationcanmovementotears．Weshouldthereforelearntochooseourwordscarefullyandusethemaccurately,ortheyWiltmakeourspeechsillyandrude．
Theoriginoflanguage（ ）． A．isreflectedinsoundsandletters
B．ishandeddownfromgenerationtogeneration
C．datesbacktotheprehistoricperiod
D．isaproblemnotyetsolved
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答案解析：