选出每组单词中不同类的一项 ,将其序号写在题前括号内 。
(1)A.happy B.angry C.sad D.worry
(2)A.train B.subway C.walk D.bus
(3)A.word book B.post card C.pet shop D.comic book
(4)A.morning B.week C.afternoon D.evening
(5)A.bike B.bus C.subway D.traffic