首页
登录
职称英语
One of the mysteries of nature is animal communication. Creatures of the s
One of the mysteries of nature is animal communication. Creatures of the s
游客
2024-11-02
27
管理
问题
One of the mysteries of nature is animal communication. Creatures of the sea move through their liquid element without any hearable sound. Yet they are able to sense the silent passing or attack of others of their kind. This is because bodies moving in water create a pressure wave, something like a gust of wind produced by a passing automobile. A narrow sensor system running along each side of the shark, from eye to tail, receives and interprets these pressure waves. I have seen sharks appear swiftly, obviously drawn by the motion of a diver’s hands, which had sent out strong waves.
One might think it impossible to distinguish odors in water. Yet sharks, surprisingly, are able to follow a scent across miles of ocean and arrive at its exact source. A diver who spears a fish and attaches its bloody body to his belt, and then goes on with the hunt, be comes a natural prey to the shark. I have seen sharks follow a scent exactly like the dogs of a hunting pack. It is no wonder th at the Greeks gave them the name "hounds of the sea."
One of the most widely believed — and dangerous — legends about the shark is that he has poor eyesight. On the contrary, the shark is well equipped to see at a distance and to dis tinguish among forms. This fact was proved to me one day when I went into the water off the coast of Africa. I sighted a shark at some distance from me as I was floating at a very shallow depth. Since I was making no movement, the sound of bubbles from my diving appa- ratus would be confused with the light splashing of the water on a rock. I turned my eyes away for a few seconds, to study the design of a giant ray just beneath me. I am not sure now whether it was simple instinct or a feeling of movement, but I turned back abruptly to ward the location of the shark. And, immediately, every muscle of my body tensed. He was no more than 30 feet away, launched toward me as hard and swift as a missile.
The sight of a shark coming at you head-on is strange. Obviously it is from this angle that he seems most frightening-the very symbol of evil, with the half-opened mouth and the three regularly spaced fins (鳍). When the shark had approached to within two feet of the rubber fins I had thrown at him as a gesture of self-defense, he turned suddenly and swam back toward the depths. There had been no sound, no scent. It appears certain that sight alone was responsible for this approach. [br] The best title for the passage is__________.
选项
A、The Mysteries of Animal Communication
B、Something Unknown About Sharks
C、An Adventure
D、How Divers Discover Sharks Under the Sea
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3828020.html
相关试题推荐
Hewasafunnylookingmanwithacheerfulface,good-naturedandagreatta
Hewasafunnylookingmanwithacheerfulface,good-naturedandagreatta
Oneofthemysteriesofnatureisanimalcommunication.Creaturesofthes
Weshallprobablyneverbeableto______theexactnatureofthesesub-atomicp
Amajorreasonforconflictintheanimalworldisterritory.Themaleanima
Amajorreasonforconflictintheanimalworldisterritory.Themaleanima
Amajorreasonforconflictintheanimalworldisterritory.Themaleanima
Amajorreasonforconflictintheanimalworldisterritory.Themaleanima
Amajorreasonforconflictintheanimalworldisterritory.Themaleanima
Amajorreasonforconflictintheanimalworldisterritory.Themaleanima
随机试题
Completethenotesbelow.WriteONEWORDONLYforeachanswer.Thesleepylizard
MoneyinAmerica Moneyisusedtobuygoods
IntheU.S.,thesenatorialtermis______years.A、3B、4C、6D、8C美国参议员每届任期6年。
Howmuchproteindoyoureallyneed?A)Themarketingiste
[originaltext]InternationalinvestigatorshavepublishedaphotoofalargeBuk
善祛中焦湿热、泻心胃火毒的药是A、黄芩 B、龙胆草 C、黄柏 D、黄连
与2006年相比较,2007年农村居民人均生活消费支出增长:A.近12%
下列药材需要在装斗前过筛过罗的是A:细粉B:全草类或种子类饮片C:细小种子类
新中国成立以来,我国的农业科技有了重大发展,其中,创新水稻育种理论,在世界上首次
下列关于吊装方法说法错误的是()。A.装配式大板结构吊装宜从中间向两端进行
最新回复
(
0
)