首页
登录
职称英语
[originaltext] The vast oceans of the world are dark, deep and mysterious pl
[originaltext] The vast oceans of the world are dark, deep and mysterious pl
游客
2023-07-09
65
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.
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://tihaiku.com/zcyy/2823255.html
相关试题推荐
【B1】[br]【B2】[originaltext]TheoriginofEarth’smoon,thelargestmooninthe
[originaltext]Frozenforeverintimearememoriesofwirerimmedglassesan
[originaltext]MedicalexpertssaymostAmericansdonotgetenoughsleepan
[originaltext]MedicalexpertssaymostAmericansdonotgetenoughsleepan
[originaltext]W:Whatareyoureadingnow?M:I’mlookingatthisbeautyinthe
[originaltext]W:Whatareyoureadingnow?M:I’mlookingatthisbeautyinthe
[originaltext]W:Whatareyoureadingnow?M:I’mlookingatthisbeautyinthe
[originaltext]W:Whatareyoureadingnow?M:I’mlookingatthisbeautyinthe
[originaltext]M:Hey,Michelle.LookwhatIjustfound.Righthereinthesand.
[originaltext]M:Hey,Michelle.LookwhatIjustfound.Righthereinthesand.
随机试题
Designofallthenewtoolsandimplementsisbasedoncarefulexperiments
Tomodernizeourcountryintheshortestpossibletime,wehavetodraw______t
当衰退时期出现时,一些本来可以寻找工作的劳动者由于对在某一可行的工资率水平下找到
D由前两个圓圈数字之间的关系,可得2+7=3X(3+0),12+9=3X(2+5),则可知(36+?)=3X(6+6),故问号处应
治疗慢性失血(如内痔出血)所致的贫血应选用A.叶酸 B.亚叶酸钙 C.谷维素
外国演员应当在工作证明上注明的起始工作日期前到申请驻外签证机关申请Z字签证,逾期
普查子宫颈癌最常用的方法是A.详细询问病史 B.宫颈多点活检 C.年度妇科检
银翘散组成中不含有的药物是A.淡豆豉、牛蒡子B.芦根、薄荷C.淡竹叶、荆芥D.桂
乡的设置是针对其农村地区的属性,通常乡驻地职能是()和服务。A.发展经济
建筑用轻钢龙骨断面一般有()。A.H形 B.U形 C.C形 D.T形
最新回复
(
0
)