选出不同类别的单词，将其编号填在括号内。(每小题2分，共10分)
(    )A. banana    B. pear    C. short
(    )A. pencil    B. car    C. ruler
(    )A. pencil    B. book    C. school
(    )A. dog      B. pig    C. play
(    )A. red      B. one    C. green