小波在阅读历史文献时发现,很多国家在古代常用文字中有关“马”的词汇特别多;而现代常用文字中关于“马”的词汇少了很多,但关于“机”的词汇却多了。造成这种变化的根本原因是( )
Name
Favorite sport
How often
Favorite player
Dream
Jack
football
often
Ronaldo
scientist
Steve
swimming
twice a week
Sun Yang
great swimmer
Marry
tennis
every day
Li Na
dancer