找出下列不同类的单词，将其编号写在前面的括号里。
(   )（1）A.housework       B. homework       C. apple
(   )（2）A.meat            B. monkey        C. bread
(   )（3）A.bring             B. interesting       C. difficult
(   )（4）A.food              B. fruit           C. cars
(   )（5）A.tennis           B. hamburger     C. baseball