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
2009-05-24
61
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 33 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.
选项
A、an effort to protect an endangered marine species
B、the civilian use of a military detection system
C、the exposure of a U.S. Navy top-secret weapon
D、a new way to look into the behavior of blue whales
答案
B
解析
提示出现在第三段的相关内容。
转载请注明原文地址:https://kaotiyun.com/show/bhYi777K
本试题收录于:
GCT工程硕士(英语)题库专业硕士分类
0
GCT工程硕士(英语)
专业硕士
相关试题推荐
个体工商户张山因购货急需,由其同乡好友马乃作一般保证人,向另一个体工商户王如林借款5万元,在借款合同上马乃以一般保证人的身份签字。后来,张山因经营不善,为逃债举家出走,下落不明。一年后债务到期,张山没有偿还债务。于是王如林直接向马乃索债。马乃以自己承担的是
Whatisthebesttitleforthispassage?Accordingtothepassage,whencouldpeoplestartusingamaglevcommerciaily?
Thereisanincreasingdemandfor______.Duringyourtrainingperioditisimportant______.
Themanagerspokehighlyofsuch______asloyalty,courageandtruthfulnessshownbyhisemployees.
WhenItrytounderstand______thatpreventssomanyAmericansfrombeingashappyasonemightexpect,itseemstomethatthe
Mother:Danny!Don’tmakeanysoundwhenyouhaveyoursoup.Danny:Yes,Mum.Father:______.He’sonlyachild.
SpeakerA:Whatshallwedothisweekend?SpeakerB:HowaboutgoingtoLondononSaturday?There’sagoodexhibitiononatthe
Therapid-transitraillinesshould______.Themanagementsystemoftherapidtransitraillines______.
StudentA:Thanksalot.Ireallyenjoyedyourcompany.StudentB:Don’tmentionit.______
ForanincreasingnumberofstudentsatAmericanuniversities,Oldissuddenlyin.Thereasonisobvious:thegrayingofAmerica
随机试题
依据信息传递具体方式的不同,沟通可以分为
A.毒力B.致病力C.抗原性D.病毒修复性E.传染力病原体侵入宿主后引起临床疾病的能力是()
患儿女,9岁。患有先天性心脏病,应用强心苷类药物治疗,护士对其家长进行有关饮食营养的健康教育时,应强调多给患儿进食
利用系数法确定用电设备组的计算负荷其公式正确的是()。
在多个互斥方案比较时,一般应选取净现值大的方案。()
对于学生在课堂上玩MP4,下列较好的教育方式是()。
简述应激的定义。
根据课程任务不同,课程类型可分为基础型课程、__________课程和研究型课程。(2014·广东)
我国课改的核心理念是()。(2016.广西)
VisualBasic源程序的续行符为
最新回复
(
0
)