Which group has made major contributions to the trend in US universities? A: Students from Iran. B: Students from Brazil. C: Students from Kuwait. D: Students from China.

Where does Liu Dan come from? A: Tianjin. B: Changsha. C: Shanghai. D: Beijing.

《铁路进站乘车禁止和限制携带物品的公告》第一项规定，子DAN包含空包DAN、战斗DAN、、教练DAN（） A: 检验DAN B: 塑料DAN C: 玩具DAN D: 泥DAN

We can conclude that Isabel Burton ______. A: had been trying to get her husband a job in a place where she could go with him B: had been trying to get her husband a job in Brazil C: was always trying to plant fruit trees from Brazil D: was always trying to make great efforts in Brazil

Dan role can be divided to: Tsing Yi Dan, Guimen Dan, Huadan, Yaodan, Wudan, Laodan, Guihu Dan, Pola Dan, and Nudan.