首页
登录
职称英语
Information about tiger sharks is rare in books so most of this paper about
Information about tiger sharks is rare in books so most of this paper about
游客
2024-06-10
22
管理
问题
Information about tiger sharks is rare in books so most of this paper about sharks will be in general. The Tiger Sharks’ Latin name is Galeocerdo Cuvier. Sharks are a member of the fish family. There are over 350 species of sharks. Sharks can be as big as 49 feet long (whale shark) and as short as 6 inches (cigar shark). Sharks’ bodies do not have bones, but have cartilage (软骨) instead. They have pointed heads with five gills (鳃) behind it. Sharks have very sharp teeth that are replaced whenever they lose teeth. Sharks’ skin can be reddish brown, bronze, metallic blue or nearly black, although most of them are gray. Some have spots, bands and marbling. Their skin is leathery (粗糙) and covered with small pointed scales (鳞) which are so sharp that if petted in the opposite direction can actually hurt your hand.
Sharks have great senses. Their eyes are sensitive and can even see in dim light. Their sense of smell is outstanding. They also have senses that humans do not. Sharks can feel when other things are around them. Also, they have organs on their snouts (鼻子) which tell them when other fish are around. Sharks are known to eat every creature in the sea including their own kind. Some sharks eat only plants and plankton (浮游生物). Others prefer live food. People have found very unusual things in sharks’ stomachs such as hooves of cows, horses, dogs, cats, goats and human corpses.
Unlike bony fish which lay hundreds of eggs at one time, sharks’ litters are much smaller. Some sharks have as few as two offspring at a time. Bony fish babies are born small and puny. Shark "pups" are born fully developed and are ready to eat the foods that full-grown sharks eat.
Some of sharks’ behavior is interesting and understood. Other behaviors are still mysterious. For example, sharks attack when they are hungry. But why they attack when they are not hungry, we do not know. They may attack for defense, because they think humans are food, because they smell blood or because they smell or sense chemicals that are interesting to them. While people may think that all sharks are dangerous, only about 30 species are considered dangerous, including the Tiger Shark. Even when sharks do attack, the victims usually do not die anyway.
Sharks are found in all of the world’s oceans although most of them prefer to live in tropical waters. A very few species live in waters as cold as the Antarctic Ocean. Sharks live at all depths of the oceans. Because sharks are so adaptable there are many of them all around the world, living in all of our oceans.
Here are some interesting facts about tiger sharks:
Shark eggs have strings attached to them. The strings hook onto corals or seaweed so the egg will not drift off. All baby sharks are called pups. Sharks are one of the oldest species of animals and have been on earth for about three million years.
Sharks’ only natural predator (猎食者) is sharks.
Unlike bony fish, sharks do not have air bladders (囊) and so if they stop swimming , they will sink to the bottom.
The largest organ in the shark’s body is its liver. Sharks can survive without food for long periods of time because they can live off the oil of their fiver.
People use many products that come from sharks such as oil, vitamins, fertilizer and leather. Some people also like to collect shark teeth and jaws. Shark meat is becoming a more popular food in the United States. [br] Compared with bony fish, what’s unique about tiger sharks when they bear offspring?
选项
答案
Some sharks have as few as two offspring at a time.
解析
参看文章第三段第二句。
转载请注明原文地址:https://tihaiku.com/zcyy/3627326.html
相关试题推荐
Informationabouttigersharksisrareinbookssomostofthispaperabout
Informationabouttigersharksisrareinbookssomostofthispaperabout
Informationabouttigersharksisrareinbookssomostofthispaperabout
Informationabouttigersharksisrareinbookssomostofthispaperabout
[originaltext]Mostpeoplepicturesharksashuge,powerful,frighteningpre
Aftermorethan40yearsofparalleldevelopment,theinformationandlife
Aftermorethan40yearsofparalleldevelopment,theinformationandlife
Aftermorethan40yearsofparalleldevelopment,theinformationandlife
Aftermorethan40yearsofparalleldevelopment,theinformationandlife
[audioFiles]audio_eusm_0192(20106)[/audioFiles]A、Collectinginformationaboutt
随机试题
Changesinthewaypeoplelivebringaboutchangesinthejobsthattheydo.
"Youarethesaltoftheearth."Thisfigureofspeechisplainandpungent.
Lastyearatairportsacrosstheworld,18%offlightsweredelayed,leaving
电焊施工现场应配置灭火器以及相应的消防安全防护措施,应有专人监护,操作现场是否清
粗集料磨光值试验所使用的新橡胶轮可直接使用。()
(2016中)对土地和地上建筑物所征收的税是:A.流转税 B.所得税 C.资
绒毛膜促性腺激素(HCG)妊娠期间分泌量达高峰的时间是A.妊娠5~7周 B.妊
自然资源核算的对象,主要是矿产、森林、耕地和水资源等。挪威和加拿大等林业发达的国
侧腭杆与龈缘的关系是()A.与龈缘接触 B.离开1~3mm C.离开4~6m
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
最新回复
(
0
)