找出下面三个单词中与其他两个不同类的那个单词,将其正确的序号填入题前括号内。
(1)A. pen B. pencil C. leg
(2)A. eye B. mouth C. teacher
(3)A. pencil B. Chinese C. English
(4)A. table B. bag C. chair
(5)A. cat B. eraser C. Dog