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

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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