C [原文第一段即为本文的中心段。]
.任务型阅读
(2016·河南省普通高中高考适应性测试)Sharks have been around for hundreds of millions of years.__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 holidaymakers in a small seaside town in the USA.__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.
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