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 n
It is hard to track the blue whale, the ocean’s largest creature which has almost been killed off by commercial whaling and is n
admin
2010-07-06
24
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 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 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
转载请注明原文地址:https://kaotiyun.com/show/j2Dd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
YouwillhearaspeechbyBobChase,PresidentoftheNationalEducationAssociation(NEA)totheAmericanAssociationofColleges
YouwillhearaspeechbyBobChase,PresidentoftheNationalEducationAssociation(NEA)totheAmericanAssociationofColleges
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
YouwillhearaninterviewwithMikeRowe,hostoftheAmericanTVshowDirtyJobs.Asyoulisten,answerthequestionsorcompl
TodayTVaudiencesallovertheworldareaccustomedtothesightofAmericanastronautsintip-topcondition,withfairhair,c
WhydoesDr.Johnsonsuggestbuildingagreenhousenearapowerstation?
Inthe18thcentury,NewYorkwassmallerthanPhiladelphiaandBoston.TodayitisthelargestcityinAmerica.Howtoexplain
Thephysiciansinahospitalformthecoreofthemedicalstaff.Buttheycouldn’tprovideeffectivemedicalcaretotheirpatie
Thetangohasprobablytraveledfurtherandgonethroughmorechangesthanalmost【21】______.Africanslavesbroughtthetango
随机试题
社长、主编和副主编三人轮流主持每周一的编辑部发稿会。某年(非闰年)1月6日的发稿会由社长主持,问:当年副主编第12次主持发稿会是在哪一天?()
某县公安局依《治安管理处罚法》对本局工作人员李某的赌博行为予以处罚而形成的相互关系是()。
以下属于程序化决策方法的是()
一般情况下,机械修配厂的火灾危险性按()确定。
综合性学习是当代教育发展的一个新特点,美术课程特别设置了()这一新的学习领域,旨在发展学生的综合实践能力和探究发现能力。
一次测验后,教师发现一年级学生在加减法运算中常有进位数加错、看错数字等现象,教师根据学生的错误进行补救与指导,这种测验属于()。
甲在化肥中掺入泥土,销售金额达20万元,但并未对相关农业生产造成影响。对甲的行为()
以下不是Access预定义报表格式的是______。
PASSAGEFOURWhat’sthepurposeofthispassage?
UsingtheMindAgainstDiseaseUsingthemindtofightdiseasesPsychologyhasanewapplicationinthefieldofmedicine.M
最新回复
(
0
)