下列哪项是影响胰腺炎的预后因素（）
A.年龄大
B.低血压
C.低氧血症
D.低白蛋白
E.病因
参考答案：A, B, C, D
Now an increasing number of middle school students go abroad for further study at their own ________, trying hard to realize their dreams.
A．price
B．cost
C．expenses
D．pay
简要阐述学习迁移：正迁移与负迁移、顺向迁移与逆向迁移、水平迁移与垂直迁移、一般迁移与具体迁移、同化性迁移、顺应性迁移与重组性迁移？
