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