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  3. The beginning of our sleep-shortage crisis can be traced back to the invention of the light bulb(灯泡)a century ago. From some dia

The beginning of our sleep-shortage crisis can be traced back to the invention of the light bulb(灯泡)a century ago. From some dia

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问题     The beginning of our sleep-shortage crisis can be traced back to the invention of the light bulb(灯泡)a century ago. From some diaries and other personal accounts in the 18th and 19th centuries, sleep scientists have come to believe that the average people used to sleep about nine hours and a half each night. " The best sleep habits were once forced on us when we had nothing to do in the evening on the farm and it was dark," says sleep specialist Roffwarg.
    By the 1950s and 1960s, that sleep schedule had been decreased greatly to between seven hours and a half and eight hours. Now social and economic tendencies are cutting even deeper.
    Perhaps the most cruel robber of sleep, researches say, is the complex things of the day. Whenever pressures from work, family, friends and community become greater, many people consider their sleep can be given up for them. Another thief of sleep is shift work, in which people work regularly in the evening, at night or on rotating(轮流) schedules, Researchers say the brain has difficulty varying sleep times, which means that these employees usually suffer a final loss of sleep.
    The availability of round-the-clock entertainment, especially all night television, also strengthens the effect of sleep-shortage. Not long ago most TV stations had to close broadcasting at midnight or 1 a. m. to urge many viewers to retire.
The average person slept about nine hours and a half each night in the 18th and 19th centuries. This is mainly because______.
选项 A、they had nothing to do in darkness
B、they worked on a farm
C、they were exhausted from the day’s hard work
D、they were too unintelligent to do anything else
答案A
解析 第一段最后一句解释到：我们当时不得不接受的最佳睡眠习惯是因为在农场黑暗的夜晚我们无事可做。因此可以得出A项是正确答案。
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