首页
登录
职称英语
One of the mysteries of nature is animal communication. Creatures of the se
One of the mysteries of nature is animal communication. Creatures of the se
游客
2023-11-20
116
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, becomes 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 that 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 distinguish 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 apparatus 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 toward 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
本文主要讲述鲨鱼具有敏锐的嗅觉和视觉,A和C文中并未详细阐述,而C只是其中具体细节。
转载请注明原文地址:http://tihaiku.com/zcyy/3204536.html
相关试题推荐
Amajorreasonforconflictintheanimalworldisterritory.Themaleani
Amajorreasonforconflictintheanimalworldisterritory.Themaleani
Amajorreasonforconflictintheanimalworldisterritory.Themaleani
Amajorreasonforconflictintheanimalworldisterritory.Themaleani
Amajorreasonforconflictintheanimalworldisterritory.Themaleani
Amajorreasonforconflictintheanimalworldisterritory.Themaleani
Amajorreasonforconflictintheanimalworldisterritory.Themaleani
Amajorreasonforconflictintheanimalworldisterritory.Themaleani
Amajorreasonforconflictintheanimalworldisterritory.Themaleani
Amajorreasonforconflictintheanimalworldisterritory.Themaleani
随机试题
Recoveryfromjetlagcantakeaslongasadayforeverytimezonecrossed.
IsitanywonderthatAmericaisalsoacountryofdangerouslyoverweightpe
[originaltext]W:Didyouturnoffthelightsandcheckthelocksonallthedoo
下列不是锥体束病变时的病理反射的是( )。A.巴宾斯基征 B.查多克征 C
如果概念B所表达的对象均在概念A所表达的范围之内;概念A所表达的对象有些在概念B
信念和态度一旦形成就很难改变,会引导消费者习惯地购买某些商品。( )
战略性衡量项目主要有()。A.团队建设 B.队伍建设 C.制度建设 D.企
人类社会是在矛盾运动中发展进步的,构建社会主义和谐社会是一个不断化解社会矛盾的持
泡沫塑料制服装垫肩
运输企业将客车安排在营运区域内多条线路上顺序轮流运行的组织方式是()。A:小循
最新回复
(
0
)