Most people are afraid of sharks, but they usually do not know much about them. For example, there are about 350 species of sharks that live in oceans over the world. All of the sharks are carnivores, but most of them don't attack people. Some sharks are very small – the smallest shark is about 6 inches long - about as long as your hand. But some sharks are very large. The largest species of sharks may be 60 feet long and weigh 15 tons. Unlike many other kinds of fish, sharks do not have bone. Their bodies are made up of a kind of tough white flexible material (called cartilage). Sharks do not have ears. However, they 'hear' sounds and movements in the wade. Any sound or movement makes the water vibrates. Sharks can feel these vibrations and they help the sharks find food. Sharks use their large eyes to find food, too. Most sharks see best in low light. They often hunt for food at dawn in the evening, or in the middle of the night.
Nowadays scientists want to learn more about sharks for several reasons. For example, cancer is common in many animals, including, people. However, it is rare in sharks. Scientists want to find out why sharks almost never get cancer. Maybe this information can help people prevent cancer too.
Câu 7: According to the passage, sharks_______.
A. always attack humans
B. are carnivores
C. usually live in warm water
D. are big mammals
Câu 8: How long is a smallest shark?
A. As long as a hand
B. As one's long hand
C. About 1,5 meters
D. About 6 centimeters
Câu 9: It can be inferred from the last paragraph that_______
A. information about sharks help people infect with cancer.
B. scientists are given permission to catch sharks for their studies.
C. the cancer risk among animals is found to be higher.
D. sharks are being studied.
Câu 10: Sharks can hunt for food at night because_______
A. their eyes are large.
B. they feel vibrations in the water.
C. they see well in the dark.
D. they 'hear' more clearly at night.
Câu 11: The word "they" underlined in the passage refers to_______.
A. sounds B. sharks
C. movements D. vibrations
monmon70023220 
Darling_274 
333cuchillthoi302 
minhquanhhqt160 