The writer holds that_. Active noise-cancellation systems require.

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问题 The writer holds that_______.
Active noise-cancellation systems require______.

选项 A、microphones
B、microprocessors
C、loudspeakers
D、all of the above

答案D

解析细节题。题意为："主动消除噪声系统需要______"。请参考文章最后一段倒数第二句：这一系统作为一种消音器最有效；其中麦克风、微处理器和扬声器三者组成一个单元围住发声的设备，在声源处消声。由此可知其他三个选项都是需要的，故答案选项正确。

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考研英语一

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The writer holds that_. Active noise-cancellation systems require.

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