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
2016-03-06
40
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. (283 words)
The deep-sea listening system makes use of______.
选项
A、the sophisticated technology of focusing sounds under water
B、the capability of sound to travel at high speed
C、the unique property of layers of ocean water in transmitting sound
D、low-frequency sounds traveling across different layers of water
答案
C
解析
本题属于细节题。尾段主要讲深海监听系统的工作原理:先说声的速度,“the speed of sound”,“What is most important”引出更为重要的原理:海水的不同层面形成声音的通道,就像听诊器把病人胸腔模糊的声音传到医生的耳中的原理一样,把声音聚在一起并据此给声音定位,“different layers of ocean water can act as channels for sounds,focusing them…”。所以选项C可以对等替换此部分,为本题答案。
转载请注明原文地址:https://kaotiyun.com/show/MOna777K
本试题收录于:
艺术硕士(艺术基础)题库专业硕士分类
0
艺术硕士(艺术基础)
专业硕士
相关试题推荐
Peopleborninautumnlivelongerthanthoseborninspringandarelesslikelytofallchronicallyillwhentheyareolder,acc
Todayourknowledgeoffoodandwhatitdoesforourbodiesarefarmoreadvancedthanthatoftheoldtimes.Nowweknowabout
Inthe1950s,thepioneersofartificialintelligence(AI)predictedthat,bytheendofthiscentury,computerswouldbeconver
Conventionalwisdomaboutconflictseemsprettymuchcutanddried.Toolittleconflictbreedsapathy(冷漠)andstagnation(呆滞).
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetoccurrencesofshortagesanddroughts(干旱)arecausing
Doyouknowhowtouseamobilephone(手机)withoutbeingrudetothepeoplearoundyou?Talkingduringaperformanceirritat
Brazilhasbecomeoneofthedevelopingworld’sgreatsuccessesatreducingpopulationgrowth—butmorebyaccidentthandesign.
Accordingtotheairlineindustrystatistics,almost90%ofairlineaccidentsaresurvivableorpartiallysurvivable.Butpassen
GenerationsofAmericanshavebeenbroughtuptobelievethatagoodbreakfastisoneoflife’sessentials.Eatingbreakfastat
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhasalmostbeenkilledoffbycommercialwhalingandis
随机试题
Childrenneedexercise.Parentsoftenworrythat【C1】________timeforathleticsorevenforjustplayingontheJungleJimisgoi
明末清初,黄宗羲、顾炎武等人针对专制集权的种种弊端,主张()。
A.肾细胞癌B.肾胚胎癌C.肾盂乳头状癌D.成人的肾混合瘤E.上述都不是上述哪一项组织学恶性,但临床上为良性
针对唇腭裂可能的病因,女性怀孕后何时开始预防为宜
房地产经纪机构发布的广告不得含有()。
关于企业规模对选择组织结构形式影响的描述,正确的是()。
纳税人享受减税、免税待遇的,在减税、免税期间应当按照规定办理纳税申报。()
甲公司2006年对乙公司投资,占乙公司注册资本的25%。乙公司的其他股份分别由其他三个企业平均持有。甲公司按权益法核算对乙公司的投资,至2007年12月31日,甲公司对乙公司投资的账面价值为300万元,其中,投资成本200万元,损益调整100万元。2008
“学生”表由字段“学号”,“姓名”构成,为表添加一个名为“年龄”宽度为3的数值型字段,应使用SQL命令:ALTERTABLE学生ADD【】。
BackinthecarefreedaysoftheNoughtiesboom,Britain’syoungstersweresweptalongbythebuy-now-pay-latercultureembraced
最新回复
(
0
)