填空题

【参考答案】

将close改为比较级形式closer。
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将primary改为primarily。
单项选择题
Which of the following is true about the U.S. Navy underwater listening network
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B．It has been replaced by a more advanced system.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.
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