请找出每个小题中不属于同一类的选项，并将字母标号填写在题前括号内。
( )（1）A. Social Studies B. homework C. Moral Education D. P. E.
( )（2）A. young B. short C. quiet D. thin
( )（3）A. fruit B. grape C. apple D. orange
( )（4）A. mountain B. sky C. air D. healthy
( )（5）A. closet B. path C. mirror D. end table