Let me tell you something about sharks. Sharks are among the oldest animals.in the world.76.There are over three hundred fifty different kinds of sharks in the world. Most sharks are about two meters long and live in the oceans.77.鲨鱼能闻到水中的事物,for example, the blood of animals. That helps them find their food.78.鲨鱼主要吃海洋中的鱼、其它鲨鱼和海洋植物。79.Most sharks bite people by mistake. They think a person is a large sea animal. When the sun goes down or comes up, sharks are looking for food. So at these times people shouldn’t go swimming in the ocean. Today people kill sharks for food and their skin.80.The number of sharks in the world is dropping fast.