感激不尽QAQThere are at least 350 species of shark ranging from

感激不尽QAQ
There are at least 350 species of shark ranging from the smallest,the pygmy ribbontail catshark (8 to 10 inches long) to the largest,the whale shark (upto 45 feet long)
Sharks are equipped with a special set of sensors,arranged in clusters over their heads,that can pick up electromagnetic currents emitted from other animals.Sharks have bad eyesight,but these sensors help detect prey from 1 to 3 yards away.Sharks can also detect the electromagnetic fields of the Earth and may use this ability to guide them during migration.
Sharks are often thought of as cold-blooded killers that prey on humans.However,only 32 species have been known to attack humans,and most attacks are accidents.Often,sharks inhabit the same shallow,warm-water areas as humans.The shark may mistake a person standing or floating in water for natural prey.The shark goes in for the kill but,after one taste,usually gives up the attack.
Many shark attacks involve people trying to free sharks from fishing nets.Sharks also are territorial animals and may attack if they feel threatened.The chances of being attacked by a shark are very small,and the chances of dying from a shark attack have greatly decreased over the years.In fact,in theUnited States,a person is 30 times more likely to be killed by lightning than by a shark.Dog bites are 1,000 times more common than shark bites.
Sharks are fished for their fins and cartilage.Shark-fin soup is a popular food in some areas.After the fin is cut off,the rest of the shark is discarded.Shark cartilage is a subject of much scientific study because medicine made from it may stop the growth of tumors.Shark cartilage is sold in pill form as an alternative medicine.Shark finning and fishing for cartilage have caused a decline in populations in some areas of the world.Sharks mature and reproduce slowly,so it is difficult for them to rebound from a decline.
Great white shark:Best known from the movie Jaws,the great white is a large,heavy-bodied shark,about 20 feet long,with large bladelike teeth.Widely the most-feared of sharks,great white attacks are rare,and most scientists agree that its reputation is undeserved.Many scientists believe it is endangered due to sport fishing and shrinking food supplies.
Whale shark:Reaching lengths of up to 50 feet,the whale shark is the largest fish on earth.This gentle giant has small teeth like whale baleen,through which it strains small fish and crustaceans.
Tiger shark:The tiger shark is considered one of the most dangerous sharks.It is about 18 feet long and inhabits shallower water,often where people swim.The diet of tiger sharks varies widely and includes all types of sea life and even garbage.

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再答： 从最小的斑鳍光唇鲨（长8至10英寸）到最大的鲸鲨（高达45英尺长）目前世界上有至少350种鲨鱼。 鲨鱼都配备一套专用的传感器，集中排列在它们的头上，可以接收从其他动物身上发出的电磁流。鲨鱼的视力不好，但这些传感器可以帮助它们探测1到3码距离内的猎物。鲨鱼也可以探测到地球电磁场，在迁移过程中这种能力可能引导着它们。 通常鲨鱼被认为是捕食人类的冷血杀手。然而，目前已知对人类有攻击性的鲨鱼只有其中的32种，大多数攻击都是意外发生的。通常情况下，鲨鱼所栖息浅海区域，也是适宜人类的温暖水域。鲨鱼可能会误将一个站立或漂浮在水中的人类当成是它的猎物。鲨鱼前去捕猎，但尝到个中滋味后，通常会放弃攻击。 许多鲨鱼袭击是源于人们试图用渔网免费捕获鲨鱼。鲨鱼也是领土动物，如果它们觉得受到威胁，它们会采取攻击。被鲨鱼袭击的几率是非常小的，历年来死于鲨鱼攻击的几率已大大减少。事实上，在美国，一个人遭雷击死亡的可能性是被鲨鱼袭击死亡的30倍。而被犬类咬伤的可能性是被鲨鱼咬伤的1000倍。 捕捞鲨鱼的目的是它们的鳍和软骨。在一些地区，鱼翅是一种很受欢迎的食物。鲨鱼的后鳍被切断，其余部分被丢弃。鲨鱼软骨成为许多科学研究的一个课题，因为它具有停止肿瘤的生长的药用价值。鲨鱼软骨作为一种替代药物正以胶囊的形式出售。在世界上的某些地区，鱼翅和软骨的捕捞正使得鲨鱼的数量急剧下降。而鲨鱼种群的成熟和繁殖缓慢，使得它们濒临灭绝。 大白鲨闻名于知名的电影“大白鲨”，它是一种大型的鲨鱼，约20英尺长，有着刀子一样的牙齿。这种令人胆寒的鲨鱼，群起的攻击却是非常罕见的，大多数科学家都同意，其声誉不当。许多科学家认为，它们濒临灭绝的原因是捕杀和食物供应萎缩。 鲸鲨长度可达50英尺，是地球上最大的鱼。这个温和的庞然大物有像鲸鱼一样的鲸须，来筛取小型鱼类和甲壳类。。 虎鲨被认为是最危险的鲨鱼之一。约18英尺长，栖息于人们经常游泳的浅水区域。虎鲨的食物范围很大，包括所有类型的海洋生物，甚至垃圾。