首页
登录
职称英语
Not all sounds made by animals serve as language, and we have only to turn t
Not all sounds made by animals serve as language, and we have only to turn t
游客
2023-07-15
62
管理
问题
Not all sounds made by animals serve as language, and we have only to turn to that extraordinary discovery of echolocation (回声定位) in bats to see a case in which the voice plays a strictly practical role.
To get a full appreciation of what this means we must turn first to some recent human inventions. Everyone knows that if he shouts near a wall or a mountainside, an echo will come back. The further off this solid obstacle, the longer time it will take for the return of the echo. A sound made by tapping on the main body of a ship will be reflected from the sea bottom, and by measuring the time interval between the taps and the receipt of the echoes the depth of the sea at that point can be calculated. So was born the echo-sounding equipment, now in general use in ships. Every solid object will reflect a sound, varying according to the size and nature of the object. A shoal of fish will do this. So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish. With experience, and with improved equipment, it is now possible not only to locate fish but to tell if it is herring, cod, or other well-known fish, by the pattern of its echo.
A few years ago it was found that certain bats emit squeaks (吱吱声) and by receiving the echoes they could locate and steer clear of obstacles—or locate flying insects on which they feed. This echolocation in bats is often compared with radar, the principle of which is similar. [br] As is discussed in the passage, the squeaks of bats can be functionally compared with______.
选项
A、human languages
B、a mountainside
C、a shoal of fish
D、taps on a ship
答案
D
解析
推理判断题。根据最后一段可知,蝙蝠发出吱吱声可以探测障碍物的距离,而第2段也指出轻敲船体可测知海底的距离,因此在功能上,D与蝙蝠的吱吱声相同。A中的human languages在文中未提到;B和C在文中各自的例子中充当的都是障碍物的角色,因此都不正确。
转载请注明原文地址:http://tihaiku.com/zcyy/2838020.html
相关试题推荐
TheWebWaytoLearnaLanguageTheyoungwomanseatedne
TheWebWaytoLearnaLanguageTheyoungwomanseatedne
TheWebWaytoLearnaLanguageTheyoungwomanseatedne
TheWebWaytoLearnaLanguageTheyoungwomanseatedne
TheWebWaytoLearnaLanguageTheyoungwomanseatedne
TheWebWaytoLearnaLanguageTheyoungwomanseatedne
Languagelearningbeginswithlistening.Individualchildrenvarygreatlyin
Languagelearningbeginswithlistening.Individualchildrenvarygreatlyin
【S1】[br]【S8】O本句是拿Achildtaughtasecondlanguageafterageten和a______作比较,并
【S1】[br]【S2】I所填词修饰languages,因此应为一形容词,选项中的形容词有potential,active,different,high和n
随机试题
[originaltext]U.S.authoritieshavetemporarilyclosedtheAmericanconsulat
Necessarymeditationsontheactual,includingthemeanbread-and-cheeseque
A—taxationsystemB—taxationC—fiscalchargesD—progressive
【B1】[br]【B7】A、majorB、prevailingC、agreeableD、claimedB本题考查的是词义辨析。B的意思是“流行的,占
Thereisnodenyingthatstudentsshouldlearnsomethingabouthowcomputers
从事施工现场临时用电工程作业的施工人员应配备防止触电的劳动防护用品。()
采用蒸汽再热循环的主要目的在于()。A.降低乏汽干度,提高循环热效率 B.
等截面直杆受力P作用发生轴向拉伸变形。已知横截面面积为A,则横截面上的正应力力和
下列关于交易型开放式指数基金的说法不正确的是( )。A.以某一选定的指数所包含的
"医方是一种专家形象,在双方关系中居于完全主动地位;而患者对医学知识一知半解,甚
最新回复
(
0
)