2. 外语
  3. The passage is chiefly about______. The deep-sea listening system makes use of______.

The passage is chiefly about______. The deep-sea listening system makes use of______.

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问题 The passage is chiefly about______.
The deep-sea listening system makes use of______.
选项 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 travelling across different layers of water
答案C
解析 根据第6段第2句“更重要的是，不同水层的海水都可以成为声道，将声音汇集在一起，就如同听诊器‘样把病人胸腔的微弱的声音传到医生的耳朵里。”揭示答案。
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