首页
登录
职称英语
[originaltext] The vast oceans of the world are dark, deep and mysterious plac
[originaltext] The vast oceans of the world are dark, deep and mysterious plac
游客
2023-07-18
18
管理
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 kilometer away. But if a whale shouts in an ocean channel, another whale may hear it tens, if not hundreds, of kilometers 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.
选项
A、Through a wide variety of high-frequency sounds.
B、Through a wide variety of low-frequency sounds.
C、Through a narrow range of high-frequency sounds.
D、Through a narrow range of low-frequency sounds.
答案
A
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/2846856.html
相关试题推荐
[originaltext]W:Goodmorning.HowcanIhelpyou?M:I’dliketoopenanewac
[originaltext]M:Wouldyouliketogooutfordinnerwithme?W:Oh,I’dlike
[originaltext]M:Wouldyouliketogooutfordinnerwithme?W:Oh,I’dlike
[originaltext]M:Wouldyouliketogooutfordinnerwithme?W:Oh,I’dlike
[originaltext]M:Wouldyouliketogooutfordinnerwithme?W:Oh,I’dlike
[originaltext]Malaria,theworld’smostwidespreadparasiticdisease,kills
[originaltext]Malaria,theworld’smostwidespreadparasiticdisease,kills
[originaltext]Malaria,theworld’smostwidespreadparasiticdisease,kills
[originaltext]Manyyearsago,whenIwasfreshoutofschoolandworkingin
[originaltext]Manyyearsago,whenIwasfreshoutofschoolandworkingin
随机试题
[originaltext](16)LosAngeles’BrentwoodSchoolhostedoneofthefirstyo
TheAmericanandtheBritish______alargenumberofsocialcustoms.A、joinB、take
OurculturehascausedmostAmericanstoassumenotonlythatourlanguage
[originaltext]InMr.Allen’shighschoolclass,allthestudentshaveto"g
客户的个人理财行为影响到其个人资产负债表,下列表述正确的有()。 Ⅰ.用银
下列文件中,属于机电工程注册建造师签章的合同管理文件是()。A.工程项目安全
最常用并且可以早期反映肾小球功能异常的检查是()。A.内生肌酐清除率测定 B
心理反应处于否认期的临终患者常表现为A.忧郁、悲哀 B.表情淡漠、嗜睡 C.
某汽运公司一分公司在六月一日有营运货车430辆,其中170辆额定吨位为5吨,25
革兰阴性菌的细胞壁肽聚糖缺少的成分是A.聚糖骨架 B.β-1,4糖苷键 C.
最新回复
(
0
)