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 hear
One of the mysteries of nature is animal communication. Creatures of the sea move through their liquid element without any hear
admin
2009-01-05
77
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.
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://kaotiyun.com/show/jwBK777K
0
专业英语四级
相关试题推荐
A、ItwasentirelyprovidedbytheTreasurerandtheCabinet.B、Itwassupportedbyenterprisesandcompanies.C、Littlewasalloc
DavidCameronhasnoticedthathealthandsafetyregulationsstopschoolstakingchildrenoutonfieldtrips,outdooractivitie
Kissing,strokingandwildembracesarecommonenough,andnowthequiet,romanticgestureofholdinghandsinpublicisa【M1】__
TheInternetprovidesanamazingforumforthefreeexchangeofideas.Giventherelativelyafewrestrictionsgoverningaccess
Themostconsistentlyidentifiedteachereffectivenessvariableistimeontask.Thatis,themoretimethatstudentsspendon
ApprenticeshipshavelongbeenpopularinEurope,butworkforce-orientedhighschooltrainingisnearlyascommonin【M1】______U
Itwasnotsolongagothatparentsdroveateenagertocampus,saidatearfulgoodbyeandreturnedbackhometo【M1】______wait
Threeblindmenwereexploringanelephant.Thefirstofthem,whohappenedtoreachtheleg,describedtheelephantlikesometh
WhileAmericanshavenoreasontobeterrifiedtositdownatthedinnertable,theyhaveeachreasontodemandsignificantimpr
A、Becauseshewassavingup.B、Becauseshewaspregnant.C、Becauseherhusbandadvisedhertodoso.D、Becauseshefellillbeca
随机试题
甲在A省完成了一项发明创造,经申请获得了实用新型专利权。乙断定该实用新型具有较大的市场潜力,于是在甲获得专利授权后不久,乙依据该专利公告的技术方案在B省批量生产和销售了相关产品。在一个偶然的场合,甲发现消费者丙正在使用该产品。经了解,丙是从丁商场购得的该产
机械性肠梗阻中最常见的病因是
电气设备安装施工时要认真阅读设备的(),进行检查接线,通电调试及运行验收。
《进出口货物征负税证明》的有效期为6个月,并实行“一证一批”的原则。
统计调查方案的内容包括()。
下列关于病毒的叙述不正确的是()。
下列关于我国武装力量的说法不正确的是()。
货币政策是政府调控宏观经济的基本手段之一,当通货膨胀较为严重时,应该采取的货币政策是:
刀刃对于()相当于()对于发霉
A、Itwashergrandfatherwhogaveherthename.B、Shehadaveryhappychildhoodinalargefamily.C、Hermarriagewiththesail
最新回复
(
0
)