wAv后缀文件名是（）压缩对象。
A.图像
B.音频
C.视频
D.文字
参考答案：B
比直角大的是（ ）。
_____ of my brothers are reporters. Covering events, meetings, or sports meetings ______ their duty.
A．Each, are
B．Both, is
C．Neither, are
D．None, is
