The passage is chiefly about ______. Which of the following is true about the U.S. Navy underwater listening network?______.

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问题 The passage is chiefly about ______.
Which of the following is true about the U.S. Navy underwater listening network?______.

选项 A、It is now partly accessible to civilian scientists
B、It has been replaced by a more advanced system
C、It became useless to the military after the cold war
D、It is indispensable in protecting endangered species

答案A

解析 依据为第三段第二行相关内容。
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