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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.
According to the sleep scientist, how long is best for a person to sleep one day?
选项 A、Less than seven and a half hours.
B、Between seven hours and a half and eight hours.
C、About nine hours and a half.
D、Between eight and nine hours.
答案C
解析 综合第一段第二句话和最后一句话可以得出C项是正确答案。
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