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
2013-09-14
24
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.
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等表明,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/L2c7777K
0
大学英语四级
相关试题推荐
A、InternetExplorer.B、IEandWindows.C、Theoperatingsystem.D、Additionalsoftware.B选项中的IE,operatingsystem,software等表明,本题可能考
AnimalsontheMoveItlookedlikeascenefrom"Jaws"butwithoutthedramaticmusic.Ahugesharkwaslowlyswimmingthrou
A、Mrs.Smithisastrictonethatcanworkyoutodeath.B、Thepositionofresearchassistantispopularamongchemistrystudent
A、Sheisrunningdown.B、Sheisalittletired.C、Sheistooworried.D、Sheisratherembarrassed.A[听力原文]W:Ikeepfeelingdiz
A、Chemistry,mechanicaldrawing.B、Socialscience.C、Agoodcommandoflanguage.D、Economicsandhistory.C[听力原文]Whatisimport
It’sanannualback-to-schoolroutine.Onemorningyouwavegoodbye,andthat【C1】______eveningyou’reburningthe;late-nightoi
A、Takingnotes.B、Oilingthegate.C、Singinghighnotes.D、Overcomingherweakness.CWhatdidMrs.Jonesoftenpractice?
Afterretiringfrom30yearsofteaching,EthbellPeppercouldeasilyhavedecidedtositbackand【B1】______andenjoyapeaceful
A、Economics.B、Business.C、History.D、English.C事实细节题。短文中提到,30年前,主修经济学和商业管理的学生仅占本科生比例的8%,而几乎12%的本科生是主修历史学的。即30年前历史专业比较受欢迎。
儒家思想由孔子(Confucius)在春秋时期创立,并迅速成为中国文化的核心内容之一。儒家重视道德和人与人之间的关系,着力于关注人类社会的秩序的和谐安定;对于虚无飘渺的神灵(illusorydivine)世界,尽量采取回避的态度,或按照自己的观念加以改造
随机试题
简述公共政策评估的消极目的。
TheOriginofMother’sDayIntheU.S.Mothers’DayisaholidaycelebratedonthesecondSundayinMay.Itisadaywhenchild
胎儿在发育过程中形成畸形最大的可能性原因是
大丹犬,四肢、躯干、腹部多处有铜钱大脱毛区,局部皮屑较多,并有向外扩大趋势。根据临床表现,该病最不可能的病原是
(一)原告被告基本情况原告:原告AA、BB,分别为投标人A公司和B公司在第三人中国农业发展银行××县支行(下称D银行)办公楼建设工程的投标活动支付了施工图纸预算费等相关运作费用。原告AA、BB均为投标人以外的与第三人D银行的办公楼建设工程招标活动
室内消火栓可以按出水口形式、栓阀数量和结构形式等分类。下列属于按结构形式对室内消火栓分类的是()。
大华机电设备有限公司于1987年10月开始经营,是中外合资企业,主要从事销售供水设备和安装服务,因经营期限届满而于2002年10月宣告终止。注册税务师经核查企业账面应缴增值税50000元,已缴增值税30000元;应缴营业税12000元,已缴营业税8000元
男性,41岁。因土石方塌方受伤,腰部疼痛,自行行走来诊。X线平片示第一腰椎压缩骨折,椎体前缘压缩约1/4。最佳治疗方案是
考迪罗在国内的主要依靠力量是()。
域名服务是使用下面的______协议。
最新回复
(
0
)