Find the different one. 找出与其他单词不同类的一项

( ) 2. A. bus

( ) 3. A. have

( ) 4. A. mall

( ) 5. A. hundred

( ) 6. A. rabbit

( ) 7. A. inside

( ) 8. A. warm

( ) 9. A. river

( ) 10. A. duck

B. cab

B. help

B. tire shop

B. sixty

B. fish

B. outside

B. cold

B. library

B. wolf

C. bicycle

C. want

C. market

C. fifty

C. horse

C. behind

C. sunny

C. mountain

C. tiger

D. car

D. movie

D. clerk

D. forty

D. cow

D. snowy

D. weather

D. tree

D. lion