首页
登录
职称英语
It is hard to track the blue whale, the ocean’s largest creature, which has
It is hard to track the blue whale, the ocean’s largest creature, which has
游客
2023-11-21
38
管理
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 noise from a patient’ s chest to a doctor’ s ear. This focusing is the main reason why even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thou- sands of miles. [br] 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B、It has been replaced by a more advanced system.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
根据文章第三段中的“…as the Navy starts to share and partly uncover its global network of underwater listening system…”可以看出,军用设备并没有完全向"civilian scientists"开放,所以, A 符合题意。
转载请注明原文地址:http://tihaiku.com/zcyy/3207276.html
相关试题推荐
Oneofthemysteriesofnatureisanimalcommunication.Creaturesofthes
Oneofthemysteriesofnatureisanimalcommunication.Creaturesofthes
Oneofthemysteriesofnatureisanimalcommunication.Creaturesofthes
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhas
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhas
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhas
Itishardtotrackthebluewhale,theocean’slargestcreature,whichhas
Thepassagetellsusthatcats___________.[originaltext]Catsarecreatures
Outdooradvertisingprovidestheadvertiserwiththelargestcolourfuldisplay
Certainlynocreatureintheseaisodderthanthecommonseacucumber.All
随机试题
[originaltext]W:SoGreg,youarequiteaworldtravelerIhear.M:Um,yeah,I
[originaltext]M:Iseeyouandyourfriendshavebeendecoratingthedormitory.
BonAppetiteA)Wealllovethefoodwegrowupo
ThefearofFridaythe13thstemsfromtwoseparatefears--thefearofthen
关于黄体发育不全,下列哪项错误A.孕激素水平不够,子宫内膜分泌反应不良 B.月
胸痛发作已10h,疑为急性心肌梗死,实验室检查优先推荐的方案为A.仅需测定CK-
《变电检测管理规定第44分册接地引下线导通测试细则》:接地引下线导通测试试验步骤
甲状腺肿块活检,镜下见肿瘤细胞呈滤泡状生长,细胞核呈典型毛玻璃样改变,核重叠,有
()的客户一般是具有一定的资产基础、一定的知识水平和风险承受能力较高的人士,他
关于小儿骨骼发育的描述,正确的是( )。A.颅缝一般闭合的年龄是生后2个月
最新回复
(
0
)