单项选择题


A．boundless
B．changeable
C．limitless
D．ceaseless
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单项选择题
A．nativeB．humanC．physicalD．animal
A．native
B．human
C．physical
D．animal
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B．It has been replaced by a more advanced system.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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