2. 职称英语
  3. The passage is chiefly about ______. [br] The underwater listening system was or

The passage is chiefly about ______. [br] The underwater listening system was or

游客2023-08-02  61
问题 The passage is chiefly about ______. [br] 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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