语篇解读:文章从追踪几乎绝迹的蓝鲸的艰难和需借助尖端设施入手,谈到了军用技术的民用问题。
5.The underwater listening system was originally designed ________.
A.to trace and locate enemy ships
B.to observe deepsea volcanic eruptions
C.to study the movement of ocean currents
D.to replace the global radio communications network
解析:选A。细节理解题。从第三段内容:水下监听是用于跟踪潜伏的敌船,可知A项正确。
6.The deepsea listening system makes use of ________.
A.the ability of sounds to travel at high speed
B.the toplevel technology of focusing sounds under water
C.the unique characteristic of layers of ocean water in carrying sounds
D.lowfrequency sounds traveling across different layers of water
解析:选C。根据最后一段中“Different layers of ocean water can act as channels for sounds focusing them in the same way a stethoscope ...”可知C项正确。
7.What can we infer from the passage?
A.New radio devices are developed for tracking blue whales.
B.Blue whales are no longer endangered with the help of the new system.
C.Opinions differ on the use of military technology.
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