给下列单词归类。
mouth ear blue pen white bag head pencil arm red eraser
yellow brown book finger foot hand black green ruler
1.文具类:ruler
2.身体部位类:mouth
3.颜色类:brown
1.文具类:ruler pen bag pencil eraser book
2.身体类:mouth ear head arm finger foot hand
3.颜色类:brown blue white red yellow black green