سؤال قراءة ستيب محلول — فهم التفاصيل (تدريب 6943)

(1) An octopus has three hearts, eight arms, and one huge brain. They are extremely intelligent. They can learn new things just like humans. They even learned a few things to get them out of dangerous situations. If an octopus is in danger of a predator, such as a shark or bird, it can use some pretty incredible skills to get away. (2) Octopuses don’t have teeth or sharp claws to defend themselves. Instead, they use more clever ways to fool their attackers. Octopuses like to hide themselves in the sand on the bottom of the ocean floor. The octopus: can change the color of its skin to match the sand. And this color change, or camouflage, happens in less than a minute. Some octopuses like to stay in more shallow water where there are rocks and coral. Because octopuses are invertebrates, meaning they don’t have backbones, they can fit themselves into small spaces between the rocks away from their predators. (3) Another way an octopus can hide is by shooting ink. An octopus uses a part of its body called a siphon to shoot ink into the water. The ink forms a cloud that hides the octopus. By the time the ink clears and the predator can see again, the octopus has swum away or hidden. (4) If an octopus is being attacked, it can actually make itself look like a dangerous sea snake. It will bury itself in the sand, keeping two arms where they can be seen. It will change the color of those arms to match a sea snake. But what if there’s no time to hide? If an octopus is in trouble, it can break one of its arms. The arm will then change colors and move around in the water in front of the predator while the octopus swims away to safety. The octopus’ arm will grow back. (5) There is one kind of octopus that has poison to use in defense. The blue-ringed octopus is tiny, it could fit inside your hand. Predators might think this size makes the octopus a great snack, but they know to stay away. The blue-ringed octopus is very poisonous and can kill predators much larger than itself, including humans. (6) Octopuses eat crabs, shrimps and lobsters, but they will sometimes eat larger prey, too, such as sharks. The octopuses usually drop down on their prey from above, and then use their powerful arms to pull it into their mouth. (7) Most octopuses stay along the bottom of the ocean, although some types are pelagic, meaning they live near the water surface. Other octopus live in deep, dark waters, and rise from below at early morning and evening to search for food. (8) For the most part, octopuses live alone in dens made from rocks. They build their dens themselves by moving the rocks into place with their powerful arms. These brilliant builders sometimes even fashion a rock door that pulls closed when the octopus is safely inside the den. How many hearts does an octopus have?