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(1) The passage is chiefly about ________.
(A) an effort to protect an endangered marine species
(B) the exposure of a US Navy top-secret weapon
(C) the civilian use of a military detection system
(D) a new way to look into the behavior of blue whales
正确答案:C
(2) The underwater listening system was originally designed ________.
(A) to monitor deep-sea volcanic eruptions
(B) to replace the global radio communications network
(C) to study the movement of ocean currents
(D) to trace and locate enemy vessels
正确答案:D
(3) The deep-sea listening system makes use of ________.
(A) the unique property of layers of ocean water in transmitting sound
(B) the capability of sound to travel at hligh speed
(C) low-frequency sounds travelling across different layers of water
(D) the sophisticated technology of focusing sounds under water
正确答案:A
(4) It can be inferred from the passage that ________.
(A) blue whales are no longer endangered with the use of the new listening system
(B) new radio devices should be developed for tracking the endangered blue whales
(C) military technology has great potential in civilian use
(D) opinions differ as to whether civilian scientists should be allowed to use military technology
正确答案:C
(5) Which of the following is true about the US Navy underwater listening network?
(A) It has been replaced by a more advanced system.
(B) It is now partly accessible to civilian scientists.
(C) It became useless to the military after the cold war.
(D) It is indispensable in protecting endangered species.
正确答案:B
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