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
One of the mysteries of nature is animal communication. Creatures of the sea move through their liquid element without any heara
One of the mysteries of nature is animal communication. Creatures of the sea move through their liquid element without any heara
admin
2010-02-17
98
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.
The author escaped from the attack of the shark by ______.
选项
A、turning around suddenly
B、screaming
C、swimming back to the shore
D、throwing rubber fins at him
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/JKnK777K
0
专业英语四级
相关试题推荐
Theroleofteachersineducationextendspastresponsibilityofpassingalonginformation.Asthenamesuggests,theprimaryf
"Almostuniversally,womenhavefailedtoreachleadingpositionsinmajorcorporationsandprivatesectororganizations,resp
ThehistoryofindigenouseducationprovisionthroughoutAustralia’sremoteareasisrepletewithinstancesofneglect,infras
Overthepasttwodecades,countriesintheworldhavebecomemoreandmoreinterdependent,andnewtechnologieshaveerasedman
Whatisthepurposeofthemeeting?
Inatelephonesurveyofmorethan2,000adults,21%saidtheybelievedthesunrevolved(旋转)aroundtheearth.An【C1】______7%d
I’mnotinterestedin__________yougoornot.
Mr.andMrs.Smitharesoexcitedtoday,fortheybought_________yesterday.
Victorcertainlytalksalotandhe’sneverinterestedinwhat________hastosay.
Jealousytypicallyreferstothethoughts,feelings,andbehaviorsthatoccurwhenapersonbelievesavaluedrelationshipisbe
随机试题
班主任了解学生的基本方法是问卷法。
预防哺乳期乳腺炎,哪项是错误的
(149~150题共用题干)初产妇,妊娠39周,骨盆各径线为:对角径13cm,坐骨棘间径9.5cm,坐骨结节间径7cm,耻骨弓角度80°本例的骨盆诊断是
消费者在购买、使用商品和接受服务时有权
某工程项目,采用以直接费为计算基础的全费用单价计价,混凝土分项工程的全费用单价为446元/m3,直接费为350元/m3,间接费费率为12%,利润率为10%,营业税税率为3%,城市维护建设税税率为7%,教育费附加费率为3%。在施工过程中,合同双方协商调整单价
单位工程竣工成本分析应包括( )。
近年来,国内玻尿酸产业的产品销售量节节攀升,竞争者不断涌入。各厂家的产品虽然在技术和性能方面有较大差异,但均可被消费者接受。产品由于供不应求,价格高企。在产品寿命周期的这个阶段,从市场角度看,国内玻尿酸产业的成功关键因素应当是()。
某篮球队共9人,其中7人善于锋位,3个善于卫位,现按照队员特长派5人(左、中、右锋和左、右卫)出场,请问有几种排法?()
WhatisthedifferencebetweenaCSU/DSUandamodem?
InhisspeechtheMinisterofIndustrysaidthatindustrialexportswentupforfive______years.
最新回复
(
0
)