Sharks Sharks 鲨鱼 There are more than 400 kinds of sharks around the world. The smallest sharks are 8 inches long and the biggest sharks are 60 feet long. Sharks are at the top of the food chain in the sea. They eat large fish. Some sharks attack humans. These types are usually great white sharks, tiger sharks and bull sharks. (小贴士: 1 feet = 30.48 cm 1 inch =2.54 cm) 17. How many kinds of sharks are there around the world?______. A. More than 40. B. More than 400. C. More than 4000. 18. Who are at the top of the food chain in the sea?______. A. Little fish. B. Sharks. C. Tigers. 19. Which kind of sharks attack humans?______. A. Bear sharks. B. Black sharks. C. Bull sharks. 20. How long are the biggest sharks?______. A. 8 inches. B. 60 inches. C. 60 feet. 本文来源：https://www.wddqw.com/doc/b5cf0f382dc58bd63186bceb19e8b8f67d1ceff2.html