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