选出与其它单词不同类的选项。（每小题2分，共10分）
(1)A. is       B. are        C. do        D. am
(2)A. cm       B. m          C. ton       D. tail
(3)A. old      B. tall       C. long      D. younger
(4)A. cooked   B. read       C. visited    D. watch
(5)A. who      B. what       C. where     D. watch