无形资产受益期限难以预计的，应按不短于（）年的期限推销。
Ａ.二
Ｂ.五
Ｃ.十
Ｄ.十五
参考答案：C
If it were Sunday today, I ______ go to school. [ ]
A. shan't
B. would not
C. can't
D. won't
采用面向对象技术开发的应用系统的特点是( )。
A．重用性更强
B．运行速度更快
C．占用存储量小
D．维护更复杂
