找出画线部分读音与其他单词不同的选项,将序号填入括号内。
( ) (1)A. good B. cook C. moon
( ) (2)A. forty B. doctor C. morning
( ) (3)A.brown B. how C. window
( ) (4)A.duty B. bus C. must
( ) (5)A.horse B. house C. mouse