unit 1 the time p00 unit 2 the newsweek 50 unit 3 the world in 2009 unit 4 business and life unit 5 courtesy unit 6 japan unit 7 afghanistan unit 8 pakistan unit 9 india unit 10 hait5 unit 11 education unit 12 science and technology unit 13 health care and technology unit 14 globalization unit 15 production
以下为对购买帮助不大的评价