找出下列单词不同类的一项。
( )(1)A. dad B. mother C. girl D. sister
( )(2)A. China B. UK C. USA D. Beijing
( )(3)A. tail B. fat C. tall D. thin
( )(4)A. in B. big C. on D, under
( )(5)A. thirteen B. fourteen C. fifteen D. pupil