Giúp mik với mn :((( mik k bt lm s hết 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. 1. According to the passage, sharks . A. are big mammals ​B. usually live in warm water C. are meat eaters​ ​​D. always attack humans. 2. How long is a smallest shark? A. About 6 centimeters ​​B. As long as a hand C. As one's long hand ​​D. About 1,5 meters 3. The word 'they' in line 9 refers to . A. sharks B. sounds C. vibrations D. movements 4. Sharks can hunt for food at night because .​ A. they hear more clearly at night​​B. their eyes are large C. they feel vibrations in the water​​D. they see well in the dark 5. It can be inferred from the last paragraph that .​ A. sharks are being studied B. the cancer risk among animals is found to be higher C. scientists are given permission to catch sharks for their studies D. information about sharks help people cure cancer