主题：Shortage of natural resources(自然资源短缺)
The prolonged development of human society proves that population and economic and social progress eventually cannot be achieved without natural resources.To save the limited resources, we must take some measures to handle appropriately the relationship between the population and resources.
该段首先进行总结：人类社会持续的发展证明，如果没有自然资源，人口的繁衍、经济和社会的发展最终都是不可能的。作者接着建议，为了节约有限的资源，我们必须采取一些措施，正确处理人口与资源的关系。
④提醒读者事物的两面性
文章的结尾还可以以转折的形式，提醒读者任何事物都有两面性，从而认识到其不足或负面的影响。例如：
主题：Solar Energy(太阳能)
However, solar energy has its disadvantages.One is that it is still very expensive for widespread practical use.Besides, solar systems would not work in cloudy or rainy days as well as at night.But in sunny areas, solar energy could help solve the energy crisis.
该段指出了太阳能的两个缺点：一、太贵;二、太阳能系统在阴雨天和晚上无法工作，从而让人们更全面地了解太阳能。值得注意的是，在指出某一事物的另一面时，不能用太多笔墨，否则会喧宾夺主，淡化主题思想。
(4)巧妙运用名言警句
名言警句的巧妙运用不仅会使文章有一定的文采，论证更加有说服力，更能显示考生的英语功底。另外能够适时引经据典，必定会让阅卷人眼前一亮。
1)开头段：名言警句或俗语谚语等作为文章的开头，既文采斐然，又能突出中心。例如：
Just as the saying goes, “ so many people, so many minds”, it is quite understandable that views on this issue vary from person to person.To this issue, different people come up with various attitudes.
2)中间段：中间段主题句之后引用名言警句，有力证明论点，起到锦上添花的效果。例如：
As a classic proverb goes that no garden has no weeds.Computers do play a positive role in the development of people’ lives, despite a slice of unfavorable impacts.We should ,therefore, take advantage of the fruits and avoid the opposite facet.
3)结尾段：用名言警句收尾，意在引申文章内涵，充分表明考生自己的观点，极具说服力，收到“言有尽而意无穷”的效果，起到了画龙点睛的作用。例如：
Therefore, we should never underestimate our own ability but should believe in the proverb: “Where there is a will, there is a way.” Confidence is a must for success.
责任编辑：sealion1986
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