选出与其他三个不同类的单词。
(  )(1)A. Bus      B. Ship            C. Bike          D. book
(  )(2)A.red light  B.traffic light    C.yellow light    D.green light
(  )(3)A. Beijing   B. Canada           C. England       D. go
(  )(4)A. stop     B. go              C.wait           D. light
(  )(5)A.morning    B.afternoon         C.evening        D.week
(  )(6)A.boy       B.cat               C.dog             D.elephant