It can be inferred from the passage that（    ）

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• 1The deep-sea listening system makes use of（    ）

  A.the capability of sound to travel at high speed

  B.the sophisticated technology of focusing sounds under water

  C.low-frequency sounds traveling across different layers of water

  D.the unique property of layers of ocean water in transmitting sound

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• 2T he underwater listening system was originally designed（    ）

  A.to replace the global radio communications network

  B.to study the movement of ocean currents

  C.to monitor deep-sea volcanic eruptions

  D.to trace and locate enemy vessels

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• 3The passage is chiefly about（    ）

  A.the civilian use of a military detection system

  B.the exposure of a U.S.Navy top-secret weapon

  C.an effort to protect an endangered marine species

  D.a new way to look into the behavior of blue whales

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• 4I n our country, the voltage of the DC ultra-high voltage power network is（    ）

  A.DC±500kV

  B.DC±800kV and above

  C.DC±330kV

  D.DC±1000kV

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• 5What  is  the  meaning  or'uHV"、（    ）

  A.The high voltage

  B.The extra-voltage

  C.The rated standard voltage

  D.The ultra-high voltage

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• 6Which of the following is true about the U.S 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  A.It has been replaced by a more advanced system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

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• 7The sun is the source of all of the following EXCEPT（    ）

  A.gasoline

  B.natural gas

  C.atomic power

  D.animal fat

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