题目内容：

选出划线部分与其他单词发音不同的词.1.smoke o划线 know ow stone o stop o
cook oo  look oo  food oo  foot oo
grass a  class a  water a  glass a
gentle g  age g  gorge g  fight ght
sign i  right i  lift i  try ry
heavy ea  least ea  meat ea  heat ea
traffic c  nice c  policeman c  city c
children ch  sandwich ch  choose ch  cheap ch