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