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Everybody knows that cats like to sleep. They spend more than half their lives sleeping and enjoy every minute of it. Other animals have different sleeping habits, however. Horses may not look like they are asleep. But they are! Horses spend about six hours sleeping every day and they do it standing up!
Fish also sleep every day but they have a strange (奇怪的) habit. They don’t close their eyes when they are sleeping. When ducks sleep they keep one eye open and half of the brain awake. It helps them stay alert (警觉的) and watch out for dangerous animals.
So what about humans? Well, most people sleep for about a third of their lives. The number of hours you sleep, however, has to do with your age. Most newborn (新生的) babies sleep a lot. They spend about 75% of their time sleeping every day! As you get older, you need less sleep. Children need about eleven hours of sleep and adults sleep about eight hours every night. So, yes, you spend many hours a year doing nothing—just sleeping in bed!
But you’re not just asleep—you’re not really doing nothing. Your body and your mind relax during this time, and a lot of things happen during sleep. Dreams are one way that the mind relaxes after a busy day. A person spends about 20% of every night dreaming. That means you have about four or five dreams every night and about 1, 600 dreams a year.
54. How do horses sleep?
_____________________________________________55. How long do most newborn babies sleep one day?
_____________________________________________56. How many hours do adults sleep less than children?
_____________________________________________57. How many animals are mentioned (提到) in the passage?
_____________________________________________58. What is the passage mainly about?
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