A-A+
The underwater listening system was originally
问题详情
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
参考答案
正确答案：A
解析：根据第三段的“…its global network of underwater listening system built over the decades to track the ships of potential enemies．”，可以看出这套系统最初是为了“trace and locate enemy vessels”而建立的，所以，A 符合题意。
