2. 外语
  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 根据第三段后半句“…network of underwater listening system built over the decades to track the ships of potential enemies”．可知水下探听系统最初主要用于追踪和确定敌人船只的位置，故选A。
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大学英语四级

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