单项选择题


A．boundless
B．changeable
C．limitless
D．ceaseless
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单项选择题
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
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B．It has been replaced by a more advanced system.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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