数码音频信号可以直接用以音频还音。( )
参考答案：错
甲地到乙地，客车要行8小时，货车要行10小时，客车和货车速度的比是______．
There ______ a bank, two supermarkets and a park in the neighborhood. [ ]
A. has
B. have
C. are
D. is
