知识掌握 1.查字典、词典,理解下列词语的意思,并各造一个句子。①际遇:________________________________________________________________________________________________②白驹过隙:________________________________________________________________________________________________③谈笑风生:________________________________________________________________________________________________④耳目一新:________________________________________________________________________________________________2.这篇散文主体上是以第一人称“我”来写的,这样便于直抒胸臆,也让读者感到真实、亲切、自然。但在文章第五段,作者又用了三个第二人称“你”,请问:这样写有何用意?________________________