题目内容：
Questionsarebasedonthefollowingpassage:
Nooneknowshowmanlearnedtomakewords．Perhapshebeganbymakingsoundslikethosemadebyanimals．Perhapshegruntedlikeapigwhenheliftedsomethingheavy．Perhapshemadesoundslikethoseheheardallroundhim--watersplashing,beeshumming,astonefallingtotheground．Somehowhelearnedtomakewords．Asthecenturieswentby,hemademoreandmorenewwords．Thisiswhatwemeanbylanguage．
Peoplelivingindifferentcountriesmadedifferentkindsofwords．Todaythereareaboutfifteenhundreddifferentlanguagesintheworld．Eachcontainsmanythousandsofwords．AverylargeEnglishdictionary,forexample,containsfourorfivehundredthousandwords．Butwedonotneedallthese．Onlyafewthousandwordsareusedineverydaylife．
Thewordsyouknowarecalledyourvocabulary．Youshouldtrytomakeyourvocabularybigger．Readasmanybooksasyoucan．ThereareplentyofbookswrittenineasyEnglishforyoutoread．Youwillenjoythem．Whenyoumeetanewword,finditinyourdictionary．Yourdictionaryisyourmostusefulbook．
Fromthispassage,weknowthat（ ）． A．mannevermadesounds
B．manmadeanimalsounds
C．manusedtobelikeanimalstomakesounds
D．manlearnedfromtheanimalstomakesounds
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答案解析：