2012年12月英语四级作文材料来源于美国劳工部网站的一份统计表，本次作文材料截取了其中一部分数据，并对时间做了修改，以下为材料原型，供大家参考。

Education pays...

Education pays in higher earnings and lower unemployment rates

Note: Data are for persons age 25 and over. Earnings are for full-time wage and salary workers.

Source: Bureau of Labor Statistics, Current Population Survey.