单选题：如果掩蔽音和被掩蔽音都是纯音，那么两个声音（　　），掩蔽作用越大。

题目内容：

如果掩蔽音和被掩蔽音都是纯音，那么两个声音（　　），掩蔽作用越大。 A．频率越接近
B．强度越接近
C．频率相差越大
D．音色相差越大

参考答案：

答案解析：

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