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 traveling across different layers of water

答案C

解析

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公共英语四级笔试

公共英语（PETS）

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

公共英语四级笔试

公共英语（PETS）

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