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
75
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:http://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
DinaBorzekowsldmadeastudyofagroupofthird-gradestudentsfromsixAm
Howmanyartistsareontherecording?[br][originaltext]Morethan60Cou
[originaltext]W:Imadeabigmistaketoday.Ireadastudent’sarticletothe
直接工程费是指施工过程中耗费的构成工程实体的各项费用,包括()。I.人工费;
关于开发和利用化学课程资源,下列说法不正确的是( )。A.学校应向高中学生开放
关于测绘地理信息档案管理的说法中正确的有( )。A.测绘地理信息业务档案定期保
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
案例十: 下面是某求助者的SCL-90测验结果: 总分243阳性项目数57
A.釉质周期性生长速率改变所形成的间歇线 B.是全身代谢障碍的表现 C.可以
财务管理的核心是基于()的管理。A.安全 B.资产 C.价值 D.利
最新回复
(
0
)