2. 考研
  3. For millions of years before the appearance of the electric light, shift work, all-night cable TV and the Internet, the Earth’s

For millions of years before the appearance of the electric light, shift work, all-night cable TV and the Internet, the Earth’s

admin2005-06-26  92
问题     For millions of years before the appearance of the electric light, shift work, all-night cable TV and the Internet, the Earth’s creatures evolved on a planet with predictable and reassuring 24-hour rhythms. Our biological clocks are set for this daily cycle. Simply put, our bodies want to sleep at night and be awake during the day. Most women and men need between eight and eight and a half hours of sleep a night to function properly throughout their lives.(Contrary to popular belief, humans don’t need less sleep as they age.)
    But on average, Americans sleep only about seven and a half hours per night, a marked drop from the nine hours they averaged in 1910. What’s worse, nearly one third of all Americans get less than six hours of sleep on a typical work night. For most people, that’s not nearly enough.
    Finding ways to get more and better sleep can be a challenge. Scientists have identified more than 80 different sleep disorders. Some sleeping disorders are genetic. But many problems are caused by staying up late and sleeping in, by traveling frequently between time zones or by working nights. Dr. James. F. Jones at National Jewish Medical and Research Center in Denver says that sleep disorders are often diagnosed as other discomforts. About one third of the patients referred to him with possible chronic fatigue syndrome actually have treatable sleep disorders. "Before we do anything else, we look at their sleep," Jones says.
    Sleep experts say that most people would benefit from a good look at their sleep patterns. "My motto(座右铭)is ’Sleep defensivejy’," says Mary Carskadon of Brown University. She says people need to carve out sufficient time to sleep, even if it means giving up other things. Sleep routines—like going to bed and getting up at the same time every day—are important. Pre-bedtime activities also make a difference. As with Elaner, who used to suffer from sleeplessness, a few lifestyle changes—avoiding stimulants and late meals, exercising hours before bedtime, relaxing with a hot bath—yield better sleep.
What is TRUE of human sleep?
选项 A、Most people need less sleep when they grow older.
B、Most people need seven and a half hours of sleep every night.
C、On average, people in the U. S. today sleep less per night than they used to.
D、For most people, less than six hours of sleep on a typical work night is enough.
答案C
解析 文章第一段提到：“Contrary to popular belief，humans don’t need less sleep as they age．”可见人所需的睡眠并不会因为年龄的增加而减少，所以A项不对。文中还提到了大部分的男人和女人一个晚上需要8～8．5小时的睡眠，而不是7．5小时。所以B项不对。文章第二段“But on average，Americans sleep only about seven and a half hours per night，a marked drop from the nine hours they averaged in 1910．”可见美国人现在每晚平均睡眠只有7．5小时，比起1910年的平均睡眠9小时时间是明显少了。所以C项正确。D项的内容与文章所说的意思相反，对于大多数人来说，通常加夜班时，不到6小时的睡眠是远远不够的，所以D项不对。因此本题的正确答案为C。
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