找出不同类的单词。
( ) 1. A. ill B. sad C. mouse D. happy
( ) 2. A. dancing B. swimming C. sing D. talking
( ) 3. A. east B. west C. easy D. north
( ) 4. A. accountant B. artist C. engineer D. teach
( ) 5. A. books B. reads C. teaches D. watches