找出不同类的单词
(   )（1）A.late        B. pleased    C. class
(   )（2）A. in         B. about      C. which
(   )（3）A.fifteen     B. seven      C. milk
(   )（4）A.do         B. does      C. be
(   )（5）A. Mr.       B. Mrs.        C.mum