国际储备结构管理的原则不包含（）
A.安全性
B.稳定性
C.流动性
D.盈利性
E.高效性
参考答案：B, E
— I heard they went skiing in the mountains last winter.
— It _____ true because there was little snow there. [ ]
A. may not be
B. won't be
C. couldn't be
D. mustn't be
简述考夫曼的教育应用模式。
