| 选出下列单词中不同类的那一个，将序号填在前面括号里。 |
| ( ) 1. A. rain ( ) 2. A. warm ( ) 3. A. head ( ) 4. A. taller ( ) 5. A. uncle ( ) 6. A. brown ( ) 7. A. thirteen | B. snow B. hat B. tooth B. farmer B. aunt B. fish B. third | C. pen C. cold C. cup C. bigger C. than C. rabbit C. three |