2

　　It can reach 6 metres in length and up to 2 000 kilograms in weight. It has as many as 3 000 needle sharp teeth, so it can sever(切断) a man's leg in a single bite.

　　But not all sharks are like the great white.

　　3

　　There are almost 400 species of sharks and more than half of these are under a metre in length.

　　The biggest sharks of all are not at all dangerous to humans. The basking shark and the whale shark grow to around 12 metres, but they are quite harmless.

　　4

　　Of these the bull shark is the one that is most likely to attack people.

　　It swims in very shallow waters where people swim.

　　5

　　Indeed you are far more likely to be killed by a dog or by bees than by a shark, and some scientists believe that sharks only attack people because they mistake them for their favourite food.

　　A. The pigmy shark, for example, is only about 20 centimetres in length.

　　B. Less than one hundred people are attacked by sharks each year.

　　C. A shark is a large fish considered to be dangerous to humans.

　　D. Only about 25 species(种类) are dangerous to people.

　　E. The great white is certainly a fearsome creature.

　　F. We can never imagine such things can happen.

　　G. They live in oceans and seas all over the world.

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