找出与其他单词不同类的一个。
(   ) 1. A. fish B. long C. short
(   ) 2. A. hot dog    B. hamburger   C. hat
(   ) 3. A. kangaroo B. monkey C. key
(   ) 4. A. eraser B. caryon    C. light
(   ) 5. A. notebook   B. math book   C.sports
(   ) 6. A. bedroom    B. kitchen C. book
(   ) 7. A. juice B. sofa    C.fridge
(   ) 8. A. classroom   B. bedroom C. here
(   ) 9. A. she B. we C. her
(   ) 10. A. friend B. friendly C.sister