使人一开始就能了解文章要说明的内容,就意味着有了良好的开端,如“catching thieves (捉贼)”的开头可以这样写:i lay in bed in the hospital. i smiled at my friends even though my legs hurt. do you want to know what happened to me? let me tell you. it’s a … story.good beginning is half done,(二)首尾呼应,再如“t