下面三个选项中有一个与其他两个不同类,请把它选出来并将其序号填入题前括号内。(5)
(1)A.baby B.brother C.town
(2)A.east B.sound C.south
(3)A.pancake B.elbow C.knee
(4)A.date B.August C.March
(5)A.lady B.straw C.king