以下是在线为同学们整理的英语四级仔细阅读练习题及答案,供各位考生参考。
Judging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic of sleepiness in the nation. I can tthink of a single study that hasn t found Americans getting less sleep thanthey ought to, says Dr. David. Even people who think they are sleeping enoughwould probably be better off with more rest.
The beginning of our sleep-deficit crisis can betraced to the invention of the light bulb a century ago. From diary entries andother personal accounts from the 18th and 19th centuries, sleep scientists havereached the conclusion that the average person used to sleep about 9.5 hours anight. The best sleep habits once were forced on us, when we had nothing to doin the evening down on the farm, and it was dark. By the 1950s and 1960s, thatsleep schedule had been reduced dramatically, to between 7.5 and eight hours,and most people had to wake to an alarm clock. People cheat on their sleep,and they don t even realize they re doing it, says Dr. David. They thinkthey re okay because they can get by on 6.5hours, when they really need 7.5, eight or even more to feel ideallyvigorous.
Perhaps the most merciless robber of sleep,researchers say, is the complexity of the day. Whenever pressures from work,family, friends and community mount, many people consider sleep the leastexpensive item on his programme. In our society, you re considered dynamic ifyou say you only need 5.5 hours sleep. If you ve got to get 8.5 hours, peoplethink you lack drive and ambition.
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