问题：
[单选题]对以下Windows 自带的一个附件\'录音机\'设备功能描述正确的是______。
A、录下的声音被保存为乐器数字接口格式（.mid）
B、录下的声音被保存为波形（.wav）文件
C、录下的声音被保存为音频文件格式（.au ）
D、录下的声音被保存为音频文件格式（.wma ）
参考答案：
B
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