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
2024-10-27
38
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 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://tihaiku.com/zcyy/3819100.html
相关试题推荐
Oneofthemysteriesofnatureisanimalcommunication.Creaturesofthese
Theevolutionofsexratiohasproduced,inmostplantsandanimalswithse
Theevolutionofsexratiohasproduced,inmostplantsandanimalswithse
Theevolutionofsexratiohasproduced,inmostplantsandanimalswithse
Whatcanweinferfromthepassage?[br][originaltext]Animalsperformman
Whatcanweinferfromthepassage?[originaltext]Animalsperformmanyusef
Manistheonlyanimalthatlaughs.Whyisthistrue?Whatmakesusrespond
Manistheonlyanimalthatlaughs.Whyisthistrue?Whatmakesusrespond
Manistheonlyanimalthatlaughs.Whyisthistrue?Whatmakesusrespond
Manistheonlyanimalthatlaughs.Whyisthistrue?Whatmakesusrespond
随机试题
Mostmeetingshaveanagenda.Foraformalmeeting,thisdocumentmaybehand
[originaltext]W:Haveyoumanagedtoassemblethemachineyet?M:I’vebeenstu
IbelievewatchingTVis________listeningtoradio.A、sogoodorbetterthanB、
计算机的中央处理器(CPU)位数越多,处理能力越弱;频率越高,处理速度越慢。
改善多发性硬化运动功能障碍的方法错误的是A.包括关节功能训练和肌力训练 B.关
以下哪种情况最可能违反了《职业道德规范》和《标准》?A.作为一名首席审计执行官,
气溶胶/烟雾产品需要一定的容器进行存放,气溶胶/烟雾产品一般不会存放的容器(
被告人因纳贿被拘捕,司法机关委托评估公司对涉案房产进行司法评估,表述恰当的有(
大力提升机器人产品在()等方面的性能和智能化水平。A.传感、交互、控制 B.
利用专用零序过电流保护(零序电流互感器ta4变比为400/5)继电器动作
最新回复
(
0
)