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
外语
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
2011-03-01
48
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 43 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.
It can be inferred from the passage that______ .
选项
A、new radio devices should be developed for tracking the endangered blue whales
B、blue whales are no longer endangered with the use of the new listening system
C、opinions differ as to whether civilian scientists should be allowed to use military technology
D、military technology has great potential in civilian use
答案
D
解析
本题属于推理性问题。这个问题我们也只有对比四个选项从中选出一个比较好的。首先我们可以排除A选项new radio devices should be developed for tracking the endangered blue whales和B选项blue whales are no longer endangered with the use of the new listening system,在前面的分析中我们已经说过,蓝鲸在本文中只是作为一个例子出现的,不可能成为文章的主题或推论的对象,
转载请注明原文地址:https://kaotiyun.com/show/pakd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Readthefollowingarticleinwhichfivepeopletalkabouttheirideasofeducation.Forquestions61to65,matchnameofeach
Britainwasawealthycountryahundredandfiftyyears【C1】______.Therewerea【C2】______veryrichpeople【C3】______receivedmone
Britainwasawealthycountryahundredandfiftyyears【C1】______.Therewerea【C2】______veryrichpeople【C3】______receivedmone
Britainwasawealthycountryahundredandfiftyyears【C1】______.Therewerea【C2】______veryrichpeople【C3】______receivedmone
ThenumberkilledintheBradfordCityfootballgrounddisasterhasrisento52;morethan70policeandspectatorshavealsobe
WhatisthelargestethnicgroupinSanFrancisco?
Finishingteacher’sevaluationsneedmaturityandobjectivity.Everysemesterwehavetheopportunitytoevaluateourinstructor
Finishingteacher’sevaluationsneedmaturityandobjectivity.Everysemesterwehavetheopportunitytoevaluateourinstruct
Muchcontroversy(争论)hasbeencausedbythepublicationofnewreportbyProfessorB.J.Martin.Thereportclaimstohavestat
Thefitnessmovementthatbeganinthelate1960sandearly1970scenteredaroundaerobicexercise(有氧操).Millionsofindividuals
随机试题
在压力容器中,封头与简体连接时,可以用球形、椭圆形封头或平盖。()
把“基层群众自治制度”首次纳入我国社会主义政治制度的范畴的是()
唇颊沟加深术最常见的方法是
患者,男,17岁。眼睑浮肿半个月。尿常规:尿蛋白(+++)。总蛋白:29g/L。双膝关节隐痛。下列有助于鉴别的检查是
【背景资料】某新建别墅群项目,总建筑面积45000m2,各幢别墅均为地下1层,地上3层,砖混结构。某施工总承包单位项目部按幢编制了单幢工程施工进度计划。某幢计划工期为180d,施工进度计划见图1。现场监理工程师在审核该进度计划后,要求
会计科目是______的名称,会计科目的内容通过______反映出来。
与交流输电相比,直流输电的优势有()。
在生活中出现摩擦、不快和委屈是常有的事,我们不能以针尖对麦芒,因为怨恨就像是一只气球,越吹越大,最后膨胀到无法控制的地步。要消除怨恨,我们应该不念旧恶,不计新怨,_______________________。
根据下列资料,回答下列问题。2012年1~5月份,北京市星级饭店接待港澳台同胞住宿人数占总的入境住宿者的比重为:
下列关于工具箱的说法中正确的是()。
最新回复
(
0
)