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luongnguyenlakiemden.ds
2 năm trước
1 người đi xe đạp đuổi theo 1 người đi bộ, vận tốc của người đi bộ là 4,5 km/h. vận tốc của người đi xe đạp là 15 km/h. Lúc 2 giờ chiều 2 người cách xa nhau 13.650 km hỏi 2 người gặp nhau lúc mấy giờ
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SHARKS Mention the word “shark” to someone on the beach and you are bound to get a reaction. Sharks have been the most feared predator of the ocean. Sharks are fish. They have been around since the time of dinosaurs. They can be found in oceans all over the world, and they have also been found in some rivers and lakes. One difference between most other fish and a shark is that most fish have bones and a shark has cartilage. Cartilage is tough, but it is not as strong as bone. Another different is that the shark is only able to swim forward, while most fish can swim forwards and backwards. Fish also generally have slippery scales, while a shark has rough scales that feel like sandpaper. There are many different types of shark. In fact, there are about 368 different types. The differences include color, habitat, behavior, and size. Sharks are also known for their very sharp teeth. They do not use their teeth to chew their food. Instead they swallow large chunks of food. They have five rows of teeth. If a tooth is broken, it is replaced by another tooth. Sharks are carnivores, meaning that they eat meat. Sharks do not normally attack people. It seems like sharks attack people a lot, but the chances of getting stung by a bee or getting hit by lighting are greater. Even so, experts say it is important to keep an eye out for sharks when swimming in the ocean. 33.31. Shark are greatly feared by humans because they _____ A. are good swimmers B. are the right size C. are carnivores D. eat only plant 34.32. According to the passage, how are sharks different from most other fish? A. They do not have scales. B. They are camouflaged. C. They are slow moving. D. They are not able to swim backwards. 35.33. How many types of shark are there? A. 300 types B. 368 types C. 386 types D. half a thousand types 36.34. How do sharks chew their food? A. They use their teeth. B. They use their tongues C. They swallow food. D. They use both teeth and tongues. 37.35. Which of the following is NOT true according to the passage? A. Most animals in the ocean are afraid of sharks. B. Sharks eat all types of food, especially both plants and meat. C. Sharks are different from one another in their color, habitat, behavior and size. D. You can get stung by a bee more frequently than be attacked by a shark.

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