选出不同类的单词。（每小题2分，共20分）
A. apple     B. orange     C. long
A. two       B. too        C. seven
A. UK        B. USA        C. CD
A. boy       B. girl       C. short
A .he        B. she        C. teacher
A. mother    B. brother    C. teacher
A. duck       B. desk        C. chair
A. plane     B. pear       C. peach
A. small      B. giraffe    C. short
A. fifteen   B. twelve     C. friend