四、还原信息(10 分)
Sharks have been around for hundreds of millions of years. 1.
C
Some live near the surface, some live deep in the water, and others on or near the ocean floor.
Sharks are often thought to be dangerous. We sometimes read about shark attacks. In 1975, the film *Jaws* was produced and many people were afraid of the great white shark which attacked humans in a seaside town. 2.
A
It can reach 6 metres long and up to 2 000 kilograms. It has nearly 300 sharp teeth, so it can cut a man's leg with a single bite.
3.
B
The pigmy shark, for example, is only about 20 centimetres long. There are almost 400 kinds of sharks and over half are less than a metre long. The biggest sharks are not dangerous to humans at all. The basking shark and the whale shark grow to around 12 metres. 4.
G
Only about 25 kinds are dangerous to people. Of these the bull shark is the one that is most likely to attack people. 5.
F
Less than one hundred people are attacked by sharks each year. In fact, you are far more likely to be killed by a dog or by bees than by a shark.
A. The great white is a scaring animal.
B. But not all sharks are like the great white.
C. They live in oceans and seas around the world.
D. We can't imagine such things can happen.
E. A shark is a large fish that is dangerous to humans.
F. It swims in very shallow (浅的) waters where people swim.
G. But none of them has been reported to have attacked people.