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