1. S1=1, Sn=1/(Sn+1+1), 求S2012 跟JJ60题有点像
2. xy=12, x^2+y^2=24, x+y有几种答案
3. working problem: A filled a tube in 24 hours, B filled a tube in 18 hours. If A and B work together to fill 8 hours, what fraction will be filled?
DS:
4. setA 和 setB 都有n个数，whether median of set A is less than average of set B
1) setA 是consecutive even numbers, setB 是 consecutive odd numbers
2) sum of set A is less than sum of set B
5. 求n!/k!
1) n=k!
2) n-k=k
6. 等腰三角形，顶角120°，BC=6，求面积
1)CD=6
2)AC垂直BD
[size=14.6667px]阅读
[size=14.6667px]1. 恐龙灭绝（感觉这片出现频率很高啊）
[size=14.6667px]2. 维生素实验
[size=14.6667px]3. 还有一个是讲现有的copyright system存在很多问题。
[size=14.6667px] P1 experts对intangible property的解读有问题。（这段没怎么理顺）大概是sharing and using intellectual property will not lose value(有考题)
[size=14.6667px] P2 大公司会对copyright有monopoly，从而限制了artists' freedom of discussion之类的，导致society less creative。
[size=14.6667px] P3 总结一下然后建议abolish system （有题问abolish system会对society产生什么影响）
[size=14.6667px]作文
[size=14.6667px]一个luxury car company在广告上的花费一直很多，觉得traditional advertising based on TV, radio, etc. 不是那么effective，因为现在的customer prefer word-to-mouth recommendations and friends acquiesce. 所以决定interview satisfied customers and put the video on the website. 这样顾客就可以查询浏览网上其他顾客的interview，从而增加customer base。
