找出类别与众不同的单词。
(1)A. Monday    B. Sunday     C. Tuesday     D. May
(2)A. feet     B. ten        C. head       D. teeth
(3)A. third    B. first      C. five       D. fifth
(4)A. bear     B. elephant    C. doctor     D. crocodile
(5)A. farmer    B. visitor    C. teacher    D. worker