【根据短文内容选择最佳答案。Arabbitisrunningintoitshole．Youmayask“Whathappened?”Well．whenarabbitseessomethingdangerousitrunsaway．Itstailmovesupan】

　　根据短文内容选择最佳答案。

　　Arabbitisrunningintoitshole．Youmayask“Whathappened?”

　　Well．whenarabbitseessomethingdangerousitrunsaway．Itstailmovesupanddownasitruns．Whenotherrabbitsseethistailmovingupanddowntheyruntoo．Theyknowthatthereisdanger．Therabbithastoldthemsomethingwithoutmakingasound．Ithasgiventhemasignal．

　　Manyotheranimalsusethiskindoflanguage．Whenabeefindssomefooditgoesbacktohishome．Itcannottelltheotherbeeswherethefoodisbyspeakingtothemlittledanceintheair．Thistellsthebeeswherethefoodis．

　　Someanimalssaythingsbymakingsounds．Adogbarksforexamplewhenastrangercomesnear．Acatpurrs(发出呼噜呼噜的声音)whenpleased．Somebirdsmakeseveraldifferentsoundseachwithitsownmeaning．

　　Buthumanbeingshavesomethingthatnoanimalshave－alargenumberofwordsthingsactionsfeelingsorideas．Weareabletogiveeachotherinformationtotellformotherpeoplewhatisinourmindorhowwefeel．Bywritingwordsdownwecanremindourselvesofthethingswhathavehappenedorsendmessagestopeoplefaraway．Noanimalscandothis．Noanimalshavethewonderfulpoweroflanguage．

　　Nooneknowshowmanlearnedtomakewords．Somehowhelearnedtomakethem．Ascenturieswentbyhemademoreandmorenewwords．Thisiswhatwemeanbylanguage．

　　Peoplelivingindifferentcountriesmadedifferentkindsofwords．Todaythereareaboutfifteenhundreddifferentlanguagesintheworld．AverylargeEnglishdictionaryforexamplecontainsfourorfivehundredthousandwords．Butwedonotknowallthese．Thewordsweknowarecalledvocabulary．Weshouldtrytomakeourvocabularylarger．Readasmanybooksaspossible．Whenwemeetanewwordlookitupinthedictionary．Adictionaryisthemostusefulbook．

　　(1)

　　Whenarabbitgivestheotherrabbitsasignalofdangerit________．

　　[]A．

　　runsintoitshole

　　B．