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B．It has been replaced by a more advanced system.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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单项选择题

The deep-sea listening system makes use of ______

A．the sophisticated technology of focusing sounds under water
B．the capability of sound to travel at high speed
C．the unique property of layers of ocean water in transmitting sound
D．low-frequency sounds traveling across different layers of water

单项选择题

By saying While it's true that.., be they scientific or artistic. (Para. 5), the author means that______

A．business management should be included in educational programs
B．human -wisdom has accumulated at an extraordinarily high speed
C．human intellectual development has reached new heights
D．the importance of a broad education should not be overlooked