请选出各小题中不属于一类的词，并将字母标号填在括号(5分)
（1）A. bike      B. subway     C. stop        D. plane
（2）A. north     B. south      C. east        D. buy
（3）A. play      B. watch      C. find        D. post office
（4）A. actor     B. singer     C. traffic     D. writer
（5）A. rain      B. cloud     C. stream      D. bike