题目内容
（请给出正确答案）
[主观题]
The underwater listening system was originally designed ________. A) to trace and
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
如搜索结果不匹配，请 联系老师 获取答案
