__1__

　　Some sharks live near the surface, some live deep in the water, and others on or near the ocean floor.

　　We tend to think of sharks as big dangerous creatures. We sometimes read about shark attacks in the newspapers, and in 1975 the film Jaws terrified moviegoers with the story of a great white shark which attacked holiday－makers in a small seaside town in the USA. __2__(切断) a man's leg in a single bite.__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.nly a fearsome creature.

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