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
2015-03-20
475
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,[17]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 kilometer 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.[18]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.
16. For whales and dolphins, which sense is most important?
17. How much faster does sound travel in the water than in the air?
18. How do 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
细节题。文中明确提到,海豚和齿鲸是通过多种高频声音(through a widevariety of high-frequency sounds)交流的,故答案为A)。
转载请注明原文地址:https://kaotiyun.com/show/g6l7777K
0
大学英语四级
相关试题推荐
A、Hecouldhelpherwiththeproblems.B、Hecouldgoouttogetherwithher.C、Sheshouldgooutforawhile.D、Sheshoulddothe
A、Aconcert.B、Anartmuseum.C、Aflowershop.D、Arestaurant.D
A、Bybringingananimalrarelyseenonnearbyfarms.B、Bybringingabagofgraininexchangeforaticket.C、Byofferingtodo
Globalwarmingmayormaynotbethegreatenvironmentalcrisisofthe21stcentury,but—regardlessofwhetheritisorisn’t—we
A、ThedigitalTVsystemwillofferdifferentprograms.B、Heiseagertoseewhatthenewsystemislike.C、Hethinksitunrealis
A、Theyarehonestandfrank.B、Theyarenottruefriends.C、Theyaresupportive.D、Theyshouldquitdrinkingwiththeman.B事实细节
JaguarsDon’tLiveHereAnymoreA)Earlierthismonth,theUnitedStatesFishandWildlifeServiceannounceditwouldappoint"cr
TheRoleofParentsinPromotingLanguageDevelopmentA)Frominfancytoearlychildhood,oneundeniablechangetakesplace—chi
A、Wateristheonlydrinktheycantake.B、Shethinkswateristhebestforhealth.C、Waterissupposedtobereadilyavailable.
随机试题
全面深化改革的总目标是()。
若当x→0时,2x2与为等价无穷小,则a=______.
女,25岁,月经周期为30天,其末次月经是2002年4月18日,其排卵日期大约在5月
有关急性脓胸的治疗方法,下列哪项是错误的
职业病的三级预防中,一级预防是指
A.初起有多个粟粒状脓头B.初起疮形如粟,突起根浅C.初起疮形如粟粒状脓头,坚硬根深D.初起光软无头,红肿疼痛,范围约6~9cmE.初起皮肤片状红斑,边界清楚,压之褪色,抬手即复
招标人在原定投标文件有效期内可根据需要向投标人提出延长投标文件有效期的要求,关于投标人的以下说法中错误的是()。
按规定上缴财政拨款结转资金、向其他单位调出财政拨款结转资金,按照实际上缴资金数额、实际调减的额度数额或调出的资金数额,在预算会计中应借记()。
NowadaysthereareanincreasingnumberofadvertisementsartTVandsomeofthemareunfortunatelymisleading.Somepeoplehold
______isnotaU.S.newsandcablenetwork.
最新回复
(
0
)