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
25
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)
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B、It has been replaced by a more advanced system.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
本题属于判断题,可以用排除法来解题。文中第三段说“冷战后,民用科学家能部分使用海军水下监听系统……”,选项A表达了这一意思,为正确答案。B“海军水下监听网络将被一种更高级的系统所取代”和D“海军水下监听网络在保护濒临灭绝的物种方面必不可少”是错误的,C的说法文中没有提到。
转载请注明原文地址:https://kaotiyun.com/show/rOna777K
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
Thefactthatblindpeoplecan"see"thingsusingotherpartsoftheirbodiesapartfromtheireyesmayhelpustounderstando
Thefactthatblindpeoplecan"see"thingsusingotherpartsoftheirbodiesapartfromtheireyesmayhelpustounderstando
Arecentstudy,publishedinlastweek’sJournaloftheAmericanMedicalAssociation,offersapictureofhowriskyitistoget
Ifyouknowexactlywhatyouwant,thebestroutetoajobistogetspecializedtraining.Arecentsurveyshowsthatcompanies
Dogsaresocialanimalsandwithoutpropertraining,theywillbehavelikewildanimals.Theywillspoilyourhouse,destroyyou
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetoccurrencesofshortagesanddroughts(干旱)arecausing
Sportisnotonlyphysicallychallenging,butitcanalsobementallychallenging.Criticismfromcoaches,parents,andotherte
Inrecentyears,Israeliconsumershavegrownmoredemandingasthey’vebecomewealthierandmoreworldly-wise.Foreigntraveli
GenerationsofAmericanshavebeenbroughtuptobelievethatagoodbreakfastisoneoflife’sessentials.Eatingbreakfastat
CarsaccountforhalftheoilconsumedintheU.S.,abouthalftheurbanpollutionandonefourththegreenhouse(温室)gases.The
随机试题
A.麻黄B.延胡索C.洋金花D.千里光E.雷公藤含有吡咯里西啶类生物碱的中药是()。
监狱等执行机关对罪犯进行的监管教育等,都属于刑事诉讼的执行活动。
具有态度诚恳、务实、坚定、坦率的让步方式是()
下列不是初级卫生保健的工作内容的是
A.肺炎链球菌B.金黄色葡萄球菌C.A族链球菌D.脑膜炎奈瑟菌E.淋病奈瑟菌在黏膜表面黏附时可产生IgAl蛋白酶的细菌是
公司发行新股必须具备的条件,不包括()。
直接传授型培训法的具体方式不包括()。(2007年5月三级真题)
对于100Mbps的以太网交换机,当输出端口无排队,以直通交换(cut—throughswitching)方式转发一个以太网帧(不包括前导码)时,引人的转发延迟至少是
YawningcanbeaproblemattheofficeforLindsayEierman,whichmakesherembarrassed."I’veexplained,’I’msorry,Ididn’t
Deathisatimeofsorrowandismarkedbyaspecialceremonyandmourning.(Passage3)
最新回复
(
0
)