找出每组单词中不同类的一项，将其代号写在括号里。
(1)A. window     B. board          C. black
(2)A. fifty      B. fine           C. five
(3)A. colour     B. Chinese book   C. math book
(4)A. thin       B. strong         C. long hair
(5)A. music      B. eyes           C. mouth
(6)A. bag        B. pencil         C. we
(7)A. computer   B. big            C. small
(8)A. book       B. teacher        C. ruler
(9)A. desk       B. chair          C. computer game
(10)A. teacher    B. student        C. school