The passage is chiefly about______. Which of the following is true about the US Navy underwater listening network?

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问题 The passage is chiefly about______.
Which of the following is true about the US 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B、It has been replaced by a more advanced system.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 根据第3段第1句“在冷战后海军开始把几十年来建立的水下监听系统部分作为民用,而这一系统本来是用于追踪潜伏的敌船的,用这个系统宋追踪蓝鲸不过是科学家把军事系统转为民用所开拓的激动人心的新领域的一个例子而已。”揭示答案。
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