从下面四个选项中选出一个划线部分发音不同的单词

（ ）A。how B。down C。flower D。yellow

（ ）A.dangerous B。colour C。soup D。favourite

( )A.story B.those C.cold D.hotel

( )A.hospital B.alone C.jOB D.office

( )A.house B.playground C. cousin D.about