1-5 比较法 ------ 通过对过去，现在 两种不同的倾向，观点的比较 , 引出文章要讨论的观点。
[1]. For years, …had been viewed as … But people are taking a fresh look now. With the growing … , people …… .
[2]. People used to think that … （In the past, …） But people now share this new .
