下面的词语各属于哪一类？分别抄在横线上。     

   狐狸   枫树   火车   竹笋   铅笔   飞机

   山羊   橡皮   汽车   尺子   猴子    白菜    花猫   木棉花

1．植物：                                                                                                                      

2．动物：                                                                                                                      

3．文具：                                                                                                                       

4．交通工具：