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Medical experts say most Americans do not get enough sleep. They say more Americans need to rest for a short period in the middle of the day. continuing with other activities.
One study earlier this year found that persons who for a few minutes during the day were less likely to die of heart disease. The study more than 2,300 Greek adults for about six years. Adults who rested for half an hour at least three times a week had a 37 percent risk of dying from heart disease than those who did not nap.
The study organizers said the strongest evidence was in working men. They said naps might improve by mitigating(减低) tension caused by work.
Some European and Latin American businesses have supported the of napping for many years. They urge people to __ work, go home and have a nap before returning. In the United States, some companies let workers rest briefly in their offices. They believe this reduces and accidents, and _increases the amount of work a person can do.
Sleep experts say it is likely that people make more mistakes at work than at other times. They say people should not important duties when they feel sleepy. And they say the best thing to do is to take a nap. About twenty minutes of rest is all you need. Experts say this provides extra energy and can increase your effectiveness _ the end of the day. But experts _that a nap should last no more than twenty to thirty minutes. A longer nap will put the body into deep sleep and waking up will be difficult.
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| 完形填空。 What will the life in the 2lst century be like? I'm sure it will be different from life in the 20th century, because many changes will take place in the new century. The population is 1 fast. There will be more and more people in the world and most of them will live 2 than before. 3 will be much smaller and more useful, and there will be at least one in every home. And computer studies will be one of the important subjects at 4 . People will work fewer hours than they did in the 20th century, and they will have more free time for sports, 5 TV and travelling. Travelling will be 6 . And many more people will go to other countries for holidays. There will be changes in our food, too. More land will be used for building new towns and houses. Then there will be less room for cows and sheep, so 7 will be more expensive. Maybe no one will eat it every day, 8 they eat more vegetables and fruit. Maybe people will be healthier. Work in the future will be 9 , too. Dangerous and hard work will be done by robots. 10 this, many people will not have enough work to do. This will be a problem. | |||
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| 完形填空。 We sometimes say the lion is "the king of the jungle" because it is stronger and 1 than the other animals. It can run faster than 2 other animals and it canhunt the 3 . The lion is the _ 4 animalin the land food chain. In the sea, theshark is at the top of the food chain. What is at the top of the world's food chain? People are! We are not the biggest of fastest, but we are the 5 . We could notfight 6 than a lion, so we invented guns. Now we can hunt the best. People's inventions are clever, but they can 7 , too. For example, many years ago in Inner Mongolia, people 8 guns to kill a lot of wild wolves. Then thenumber of wild rabbits is becoming 9 because there is no wolf eating them. Thewild rabbits competed for the grass with the sheep and cows. Much of the grasslandbecame desert because it was seriously 10 by the rabbits. Remember that we are a part of the food chain, so we are in danger, too! If we protect animals, we are protecting ourselves. | |||
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