读一读下列单词，选择每组中不同类的单词。 (     ) 1. A. woman (     ) 2. A. America (     ) 3. A. bread (     ) 4. A. man (     ) 5. A. twenty (     ) 6. A. bag (     ) 7. A. monkey (     ) 8. A. pencil B. father B. Canada B. water B. teacher B. night B. blue B. mother B. eraser C. brother C. China C. hot dog C. boy C. nineteen C. brown C. mouse C. ruler D. grandfather D. Zhejiang D. hamburger D. girl D. nine D. black D. duck D. school