[单项选择]

{{B}}Sharks{{/B}}
Sharks are amazing fish that have been around since long before the dinosaurs existed. They live in waters all over the world, in every ocean, and even in some rivers and lakes.
{{B}}Sharks and long fish{{/B}}
Unlike bony fish, sharks have no bones; their skeleton is made of cartilage (软骨), which is a tough, fibrous (纤维性质的) substance, not nearly as hard as bone. Cartilage, a strong fibrous substance, is softer than bone; our nose and ears are made of cartilage. Sharks also have no swim bladder (鳔) (unlike bony fish).
{{B}}Size{{/B}}
There are many different species of sharks that range in size from the size of a person’s hand to bigger than a bus. The Whale shark is the largest fish in the world; the basking .shark (姥鲨) is the second largest fish. Fully-grown sharks range in size from 7 inches long, up to 50 feet long. Most sharks are intermediate in size, and are about
A. The whale shark.
B. The basking shark.
C. The spiny dogfish shark.
D. The great white shark.

{{B}}Sharks{{/B}}
Sharks are amazing fish that have been around since long before the dinosaurs existed. They live in waters all over the world, in every ocean, and even in some rivers and lakes.
{{B}}Sharks and long fish{{/B}}
Unlike bony fish, sharks have no bones; their skeleton is made of cartilage (软骨), which is a tough, fibrous (纤维性质的) substance, not nearly as hard as bone. Cartilage, a strong fibrous substance, is softer than bone; our nose and ears are made of cartilage. Sharks also have no swim bladder (鳔) (unlike bony fish).
{{B}}Size{{/B}}
There are many different species of sharks that range in size from the size of a person’s hand to bigger than a bus. The Whale shark is the largest fish in the world; the basking .shark (姥鲨) is the second largest fish. Fully-grown sharks range in size from 7 inches long, up to 50 feet long. Most sharks are intermediate in size, and are about
A. The passage tells us why sharks are dangerous to people.
B. The passage tells us the habitat and migration of sharks.
C. The passage introduces the basic information about sharks.
D. The passage introduces the evolutional process of sharks.