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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
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解析：
细节题。最后一段叙述了不同海水层可充当声音传播的频道。听诊器的工作原理与此相同，把声音汇集起来，也正是这种声音汇集才能把大海里甚至微弱的声音，特别是那些低频的声音，传播至数千里之外。A项讲述的是听诊器的技术，非海水传音原理，与文中内容不符。只有C项与原文内容相符。
细节题。最后一段叙述了不同海水层可充当声音传播的频道。听诊器的工作原理与此相同，把声音汇集起来，也正是这种声音汇集才能把大海里甚至微弱的声音，特别是那些低频的声音，传播至数千里之外。A项讲述的是听诊器的技术，非海水传音原理，与文中内容不符。只有C项与原文内容相符。
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