The passage is chiefly about. The underwater listening system was originally designed.

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问题 The passage is chiefly about______.
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3段第1句“几十年前建立的全球水下监听系统本来是用于跟踪潜伏的敌船的。”揭示答案。

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本试题收录于：职称英语卫生类B级题库职称英语分类

职称英语卫生类B级

职称英语

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The passage is chiefly about______. The underwater listening system was originally designed______.

职称英语卫生类B级

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The passage is chiefly about. The underwater listening system was originally designed.