单选题：Modem是计算机通过电话线接入Internet时所必需的硬件，它的功能是（　　）。

题目内容：

Modem是计算机通过电话线接入Internet时所必需的硬件，它的功能是（　　）。 A．只将数字信号转换为模拟信号
B．只将模拟信号转换为数字信号
C．为了在上网的同时能打电话
D．将模拟信号和数字信号互相转换

参考答案：

答案解析：

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