先讲一个较短的故事来引发读者的兴趣，引出文章的主题。（建议少用）
[1] Once in (a newspaper), I read of/learnt ... The phenomenon of ... has aroused public concern.
[2] I have a friend who ... Should he ....? Such a dilemma we are often confronted with in our daily life.
[3] Once upon a time, there lived a man who .... This story may be (unbelievable), but it still has a realistic significance now.