读词语，再按要求分类。

     柳树   玫瑰  小鹿  小猪  桃树  杏树  牡丹   

     老牛  大马  菊花  杨树  吊兰  梅花  松树  

花：                                                                                                              

树：                                                                                                             

动物：                                                                                                            

怎样评价产业内贸易理论。