词汇拓展：
1. Metropolis 大都市
2. dedication 奉献
3. extended family 大家庭
4. nuclear family 小家庭
5. scenario 情况
6. in the hope of 希望
7. reject 抗拒
8. generation gap 代沟
9. career pursuit 事业追求
10. require 需要
11. dedication 奉献
12. conflict 有冲突
13. adopt 采用，采纳
14. ageing population 老龄化
15. labor force 劳动力
16. Medical care service 医疗服务
17. in demand 被需要
18. long term and stable relationship 长期稳定的关系
19. be associated with 与…相关
20. personal sense of happiness 个人的幸福感
21. satisfaction 满意
22. isolation 孤立
23. Dink 丁克
24. Optimistic 乐观的
25. urban 城市的
26. original 本来的
27. be disconnected with 失去联系
28. Assimilate 同化
29. globally popular cultures 全球流行的文化
30. Birthrate 出生率
小作文：流程图，drinking water production。
写作策略：一般现在时，按照顺序描述，主体分两段,一段描述太阳能电板的作用，另一段描述水的生产。
大作文
In many countries today, people in cities either live alone or in small family units, rather than in large, extended family groups. Is this a positive or negative trend?
相关题目分析：
As countries develop, their populations tend to live individually or in small family units. In your opinion, what is this cause and what are the effects on society. 2013.04.14
In some countries around the world men and women are having children late in life. What are the reasons for this development? What are the effects on society and family life? 2012.12.08
Live individual 意味着不结婚，不和父母住一起;small family units指的是丁克夫妇，不要孩子的夫妻。have children late in life是说生孩子晚。后两道题都是report题型，且都是问原因和结果;而今天的题目问优劣势，但是有交叉部分。
提纲：
| Positive | negative |
|
1.独立，自由
2. 专注追求事业和个人成就 |
1.老龄化，劳动力缺乏，医疗开支增加
2.幸福感降低，孤独感增加 3.传统文化丢失 |
In modern society, young people prefer to stay apart from their parents and live alone in a metropolis. Further, they have a tendency of postponing their parenthood until late 30’s or even early 40’s.
Young adults adopt this very independent lifestyle in the hope of taking some advantages. In this scenario, they have more freedom which allows them to do what they find interesting and worthwhile but their parenting may not because the older generation may hold their traditional way of life or values which may be rejected by the younger one. On top of the generation gap, nuclear family favors career pursuit which requires muchdedication including time, energy and concentration, thus conflicting with extended familywhich requires the same. To achieve the dream of success, young people have left their hometown and their family, rushing alone into major cities where more social resources canbe explored and more chances of career success can be expected. （定语从句，what引导宾语从句，but并列句，原因状语从句，被动句，非谓语，where引导状语从句）
However, this modern lifestyle can have some negative effects on individuals and the society as a whole. Firstly low birthrates can result in an ageing population and a lack oflabor force in the future. Medical care service will be in high demand and medical cost will rise significantly. In terms of traditional culture, respect for family and community is being impaired at the cost of personal career pursuit. Living alone without long term and stable relationships is widely thought to be associated with the lack of personal sense of happinessand the increase of sense of isolation, which would reduce an individual’s generalsatisfaction with life. （并列句，被动句，定语从句）
My personal view on Dink and single family is not totally optimistic. While the young couples or singles enjoy their personal space and career oriented urban lifestyle without the responsibility of raising children, they are disconnected with their families and originalcommunity and hence losing traditional values and cultures, and being assimilated by globally popular culture. (while对比从句，被动句，非谓语)
