找出不同类的一项。
(   ) 1. A. accountant  B. artist    C. engineer   D. teach
(   ) 2. A. books       B. reads    C. teaches    D. watches
(   ) 3. A. cloud      B. rain      C. sun        D. seed
(   ) 4. A. east       B. west      C. straight   D. south
(   ) 5. A. post office B. pet shop  C. post card   D. theme park