单选题The underwater listening system was originally designed ______.Ato trace and locate enemy vesselsBto monitor deep-sea volcanic eruptionsCto study the movement of ocean currentsDto replace the global radio communications network
单选题
The underwater listening system was originally designed ______.
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
参考解析
解析：
细节题。第二段末句，水下声控系统，在过去几十年里建起来的用来追踪潜在敌人舰只的，只有A项合文意。
细节题。第二段末句，水下声控系统，在过去几十年里建起来的用来追踪潜在敌人舰只的，只有A项合文意。
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