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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
68
管理
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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