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单选题
The passage is chiefly about ______.
A
an effort to protect an endangered marine species
B
the civilian use of a military detection system
C
the exposure of a U.S. Navy top-secret weapon
D
a new way to look into the behavior of blue whales
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解析：
主旨题。本文主要叙述在冷战结束后，民用科学家首次使用在过去几十年建立起来的追踪潜在敌人军舰的水下监听系统网络，进行民用科研。对蓝鲸追踪仅仅是个引导，本文既不是对蓝鲸追踪法的研究也不是对海军秘密的揭露，而主要说明美国海军水下声音监测装置为民用科学家服务的问题，B项与文章内容相同。
主旨题。本文主要叙述在冷战结束后，民用科学家首次使用在过去几十年建立起来的追踪潜在敌人军舰的水下监听系统网络，进行民用科研。对蓝鲸追踪仅仅是个引导，本文既不是对蓝鲸追踪法的研究也不是对海军秘密的揭露，而主要说明美国海军水下声音监测装置为民用科学家服务的问题，B项与文章内容相同。
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