六级英语作文是大学英语四六级考试中非常重要的一部分，因此在备考过程中，掌握一些万能句子是十分必要的。下面就是一些常用的六级英语作文开头和结尾摘抄：

开头：

1. Nowadays, with the rapid development of society, many problems arise, such as…

2. It is widely acknowledged that…has become a hot topic recently.

3. In recent years, people have become increasingly aware of the importance of…

4. As is known to all, the issue of…has always been a matter of concern.

5. With the growing importance of…, more and more people begin to realize the significance of…

结尾：

1. In conclusion, it is high time that we took effective measures to deal with the problem of…

2. To sum up, we should make joint efforts to tackle the issue of…so as to create a better world.

3. From what has been discussed above, we can draw the conclusion that…is of great significance.

4. In a word, we should take action now to address the problem of…before it is too late.

5. In light of the above discussion, I firmly believe that…is the key to solving the problem.

以上摘抄的万能句子可以帮助考生在六级英语作文中灵活运用，使文章更富有思想性和逻辑性，提升文章的质量和得分。