找出不同类的单词，把序号写在提前的括号内。
(     )（1）A. skirt         B. T-shirt         C. book
(    )（2）A. grandpa       B. sister          C. teacher
(    )（3）A. he            B. she             C. mother
(    )（4）A. red           B. colour          C. yellow
(    )（5）A. he            B. is              C. are