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
外语
A、Through a wide variety of high-frequency sounds. B、Through a wide variety of low-frequency sounds. C、Through their varied swim
A、Through a wide variety of high-frequency sounds. B、Through a wide variety of low-frequency sounds. C、Through their varied swim
admin
2014-02-25
29
问题
The vast oceans of the world are dark, deep and mysterious places where eyesight counts for little as soon as you venture very far beneath the surface.
For humans, who live in a world dominated by visual stimuli, to exist in such conditions would be impossible. But for whales and dolphins that live in the ocean or, in the case of a few species, muddy rivers, the darkness is unimportant. What is important to them is sound.
Sound is an efficient way to transmit and sense information, especially as it travels five times faster through water than through air. If humans shout to someone, it is unlikely that they will be heard a kilometre away. But if a whale shouts in an ocean channel, another whale may hear it tens, if not hundreds, of kilometres away.
Whales and dolphins use sound in two ways: for communication and for echolocation. Dolphins and toothed whales communicate through a wide variety of high-frequency sounds.
But as well as using sounds to communicate, toothed whales and dolphins also rely on echolocation to learn about their immediate environment, including prey that might be waiting nearby. They produce intense short broad-band pulses of sound in the ultrasonic range. These clicks are brief, typically less than one millisecond long — but they are repeated many times each second.
Questions 16 to 18 are based on the passage you have just heard.
16. For whales and dolphins, which sense is most important?
17. How much faster does the sound travel in the water than in the air?
18. How do the dolphins and toothed whales communicate?
选项
A、Through a wide variety of high-frequency sounds.
B、Through a wide variety of low-frequency sounds.
C、Through their varied swimming gestures.
D、Through the echolocation.
答案
A
解析
选项中的through…sounds/gestures表明,本题考查做某事的方式。短文中提到,海豚和齿鲸是通过多种高频声音(through a wide variety of high—frequency sounds)来交流的,故答案为A)。
转载请注明原文地址:https://kaotiyun.com/show/WYS7777K
0
大学英语四级
相关试题推荐
A、Ataclinic.B、Inasupermarket.C、Atarestaurant,D、Inanicecreamshop.C对话中,男士要吃牛排、法式煎饼、巧克力奶酪甜点,而女士对他说这些食物脂肪、糖等含量太高,这样会对身
A、IntensiveReading.B、ExtensiveReading.C、Literature.D、Listening.D男士说他“买了一本听力书”,可知选项D(听力)正确。听到listeningpractice便可顺利作答。否则,听到
A、Harvard.B、Yale.C、Princeton.D、Cornell.A文中提到“演员JohnLithgow是哈佛大学1967届毕业生”,根据问题,选A。
A、Farmers.B、Citypeople.C、Businesspeople.D、Students.A女士说:“邮购业务很受农场主欢迎”,并说“农场主们信赖Ward和Sears”。可知该业务的主要客户是农场主。本题较简单,对话中多次提到far
Whenwehavetotalkaboutsomethingthatmaybegoingwrong,wherethere’ssometroublebrewing(酝酿着),orsomethingthatmight【
A、Heshouldconsumelesssalt.B、Heshouldeatlessvegetable.C、Heshouldeatmoreprotein.D、Heshouldeatlessfattyfood.D女
TheBestandWorstFoodsforHealthyWeightWhenitcomestokeepingyourweightdown,anewstudybyHarvardresearcherssu
A、Theyrepaveditwithrocks.B、Theybuiltpublicrestroomsonit.C、Theybeautifieditwithplants.D、Theysetupcookingfacil
A、Themanwillhaveabloodtest.B、Themanisgoingtobuyvegetable.C、Themanandwomandon’twanttoinviteothers.D、Thema
A、Theytendtoputlotsofmake-upontheface.B、Theywilleatmorecucumberseveryday.C、Theytendtotrynaturalvegetables
随机试题
A.清茶调服B.米汤送服C.淡盐水送服D.温开水送服E.忌与热茶同饮云南白药治疗出血证的正确使用方法是()。
资料:小王为某公司的单身员工,每月工资为1.2万元,每年年终有年终分红5万元,每月的支出大概为5000元,为了长远打算,他想请你给他做投资规划。根据案例回答下列问题。小王准备将部分资金投资于股票,关于股票下列说法不正确的是()。
假设某公司每年需外购零件3600件,该零件单位变动储存成本为20元,一次订货成本为25元,单位缺货损失为100元。在交货期内,生产需要量及其概率如下:要求:计算年最佳订货次数及每年与批量相关的存货总成本;
(2013年卷一第14题)下列关于审查意见通知书的说法哪些是正确的?
下列关于中国选举制度的基本原则,表述正确的是()。
[*]
幂级数(x+2)n在x=0处收敛,在x=-4处发散,则幂级数的收敛域为________。
在下列性质中,()不是分时系统的特征。
数据库的三级模式结构由外模式、模式和内模式组成,适合数据库类型有______。Ⅰ.关系型数据库Ⅱ.层次型数据库Ⅲ.网状型数据库
Ithoughthavingababywouldhurtmywritingcareer.Iwaswrong.A)Ialmostdidn’thaveachildbecauseofmycareera
最新回复
(
0
)