四六级考试

【单选题】 The deep-sea listening system makes use of ______
A．the sophisticated technology of focusing sounds under water
B．the capability of sound to travel at high speed
C．the unique property of layers of ocean water in transmitting sound
D．low-frequency sounds traveling across different layers of water

网考网参考答案：C
网考网解析：
文章的最后一段讲述"the deep-sea listening system”的工作原理，其中讲到"What is most important，different layers of ocean water can act as channels for sounds．．．”，由此可见，这一系统就是利用了在传送声音方面"layers of ocean water”的独特特性，因此[C]是正确答案。 查看试题解析出处>>