大学英语六级作文开头句型6大写法：比较法
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 idea.
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