2. 考研
  3. The passage is chiefly about ______. The underwater listening system was originally designed ______.

The passage is chiefly about ______. The underwater listening system was originally designed ______.

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问题 The passage is chiefly about ______.
The underwater listening system was originally designed ______.
选项 A、to trace and locate enemy vessels
B、to monitor deep-sea volcanic eruptions
C、to study the movement of ocean currents
D、to replace the global radio communications network
答案A
解析 主要依据在第三段第二行、第三行相关内容。
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