从事对外贸易活动必须具备的条件有()
A.远大的眼光
B.良好的商业信誉
C.各种专业理论与知识
D.灵通的商业情报
E.雄厚的资金
参考答案:A, B, C, D, E
Wu Dong was _____ tired that he couldn't keep his eyes_____. [ ]
A. so; open
B. too; open
C. so; closed
D. too; closed
异羟肟酸铁反应的现象是()
A.红色
B.黑色
C.紫色
D.蓝色
E.绿色