选出不同类的一项。 ( ) 1. A. coffee ( ) 2. A. chicken ( ) 3. A. tea ( ) 4. A. pencil ( ) 5. A. duck ( ) 6. A. green B. juice B. bread B. ear B. hotdog B. eraser B. orange C. purple C. hamburger C. leg C. ruler C. panda C. head D. milk D. pen D. arm D. crayon D. monkey D. pink