首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is
It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is
admin
2011-01-17
72
问题
It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.
So biologists were delighted early this year when with the help of the Navy they were able to track a particular blue whale for 33 days monitoring its sounds. This was possible because of the Navy’s formerly top-secret system of underwater listening devices spanning the oceans.
Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies.
Earth scientists announced at a news conference recently that they had used the system for closely monitoring a deep-sea volcanic eruption (爆发) for the first time and that they plan similar studies. Other scientists have proposed to use the network for tracking ocean currents and measuring changes in ocean and global temperatures.
The speed of sound in water is roughly one mile a second--slower than through land but faster than through air. What is most important, different layers of ocean water can act as channels for sounds, focusing them in the same way a stethoscope (听诊器) does when it carries faint noises from a patient’s chest to a doctor’s ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.
Which of the following is true about the U.S. Navy underwater listening network?
选项
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B、It has been replaced by a more advanced system.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.
答案
A
解析
主要依据为第3段第2行的相关内容。
转载请注明原文地址:https://kaotiyun.com/show/qMYi777K
本试题收录于:
GCT工程硕士(英语)题库专业硕士分类
0
GCT工程硕士(英语)
专业硕士
相关试题推荐
What’sthepurposeoftheconference?HowmanyChinesestudentsareinvolvedintheconference?
Mr.Woods:I’dlikeadoubleroomfortonight.Clerk:______?Mr.Woods:Yes.IcalledyoulastweekfromNewYork.MynameisG
Attheresortstouristsmaydothefollowingexcept______.WhatisthedifferencebetweentheresortsadvertisedandtheEmbas
Anotherculturalaspectofnonverbalcommunicationisonethatyoumightnotthinkabout:space.Everypersonperceiveshimself
Itisessentialforapolicemantobetrainedincriminallaw______.WhichofthefollowingisTRUEaccordingtothepassage?
Maryalways______thingsoverwithherparentsbeforeshemakesanimportantdecision.
Imagineaworldinwhichchildrenwouldbetherulersandcoulddecidenotonlytheoutcomeofeachandeveryoccurrence,butal
Themainpurposeofthispassageisto______.Howcanamotherhelpthebabytocryless?
Wilson:Hello,thisisWilson.CanIspeaktoPeter,please?Johnson:______.
Thiscountry,asLincolnsaid,belongstothepeople.Sodothenaturalresourceswhichmakeitrich.Theysupplythebasisofo
随机试题
下列关于法与人权的说法中,哪些选项是正确的?()
已经登记注册的机动车有________________变动,不必到车管所办理相应的登记手续。
消除系统误差的方法为( )。
市场经济的局限性表现在()。
任何一个统计问题的最基本要素是()。
党务工作的指导思想是什么?
马克思主义群众观点的主要内容包括()。
1803年,美国联邦最高法院在审理()一案,开创了由最高司法机构审查国会制定的法律是否符合宪法的先例。
I’mtryingtousethe______FrenchIhavejustlearnt.
A、Assembling.B、Marketing.C、Electriccars.D、PublicAdministration.C
最新回复
(
0
)