1、结论性：通过对文章前面的讨论,引出或重申文章的中心

[1].From what has been discussed above, we may easily draw the conclusion that .....

[2].In summary , it is more valuable .......

2、后果性：揭示所讨论的问题若不解决,将产生的严重后果.

[1].We must call for an immediate method , because the current phenomenon of ... ,if allowed to proceed, will surely lead to the heavy cost of .......

[2].Obviously,if we ignore/are blind to the problem , there is every chance that ..will be put in danger.

3、号召性：呼吁读者行动起来,采取行动或提请注意

[1].It is time that we urged an immediate end to the undesirable tendency of····

[2].It is essential thar effective measures should be taken to correct the tendency.英语四级听力