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
2011-01-17
39
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.
The underwater listening system was originally designed ______.
选项
A、to trace and locate enemy vessels
B、to monitor deep-sea volcanic eruptions
C、to study the movement of ocean currents
D、to replace the global radio communications network
答案
A
解析
主要依据在第3段第2行、第3行的相关内容。
转载请注明原文地址:https://www.kaotiyun.com/show/YMYi777K
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
简论南京国民政府新刑法的基本结构及特点。
Tom:Youareplayingguitarwell.Canyoureadmusic?Charles:No,Idon’t.Ijustlistentosongsontheradioandthenplayth
What’sthepurposeoftheconference?WhichofthefollowingstatementsisTRUEaccordingtothereport.
Thebravemanwasgreatlyhonouredwhentheorganizerannounced,"You______amedal!"
Ican’tgiveyou______forthetypeofcaryousellbecausethere’snodemandforitinthemarket.
Inwhatsensedoe-booksexertanegativeimpactontheenvironment?WhatisJasonOhler’sattitudetowardse-books?
A:DoctorSmithisengagedonWednesday.WouldyouliketocomeonThursday?B:______.
Wilson:Hello,thisisWilson.CanIspeaktoPeter,please?Johnson:______.
Sportisnotonlyphysicallychallenging,butitcanalsobementallychallenging.Criticismfromcoaches,parents,andotherte
Phonecaller:Hello.CouldIpleasespeaktoHelen?Helen:______.
随机试题
在现代化生产中,劳动资料包括十分复杂的内容。下列各项属于劳动资料的内容的有
从肘静脉注入对比剂后,最迟到的是下列中的哪一部位
转移性右下腹疼可见于上腹部刀割样剧疼可见于
下列法院对于诉讼中出现的各种情况的处理,做法正确的是?
苏某和熊某毗邻而居。熊某在其居住楼顶为50只鸽子搭建了一座鸽舍。苏某以养鸽行为严重影响居住环境为由,将熊某诉至法院,要求熊某拆除鸽棚,赔礼道歉。法院判定原告诉求不成立。关于本案,下列哪一判断是错误的?
【2014年真题】根据《建设项目工程总承包合同(示范文本)》,在合同专用条款中应约定预付款的()。
标准的个人理财规划的流程包括以下几个步骤:①.收集客户资料及个人理财目标;②.综合理财计划的策略整合;③.客户关系的建立;④.分析客户现行财务状况;⑤.提出理财计划;⑥.执行和监控理财计划。正确的次序应为()。
Thehorseandcarriageisthingofthepast.Butloveandmarriagearestillwithusandstillcloselyinterrelated.MostAmeric
A=BOOK1B=BOOK2C=BOOK3D=BOOK4Whichbook(s)say(s)that...theclimateaffectsthefuturesustainableagricultural
A、Tovisithisrelatives.B、TotakeanEnglishcourse.C、Todosomesnowboarding.D、Todosomeskiing.B①选项都是不定式结构,故本题问原因或目的。②男士
最新回复
(
0
)