设置虚基类的目的是( )。
A．简化程序
B．消除二义性
C．提高运行效率
D．减少目标代码
参考答案：B
－ ______ does your mother watch the Talk Show?
－ Once a week.
A. How long B. How often C. How soon
连词成句.
1．doesn't, tennis, have, sister, rackets, my, (. )
2．my, is, backpack, bed, on, the, (. )
3．Mike, tomatoes, does, like, (?)
4．dinner, chicken, for, Bill, likes, eggs, and, (. )
5．fax, is, what, her, number, (?)
