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  3. Who doesn’t welcome the sweet oblivion of a good night’s sleep? The sad reality, however, is that a decent slumber is increasing

Who doesn’t welcome the sweet oblivion of a good night’s sleep? The sad reality, however, is that a decent slumber is increasing

admin2015-02-12  7
问题     Who doesn’t welcome the sweet oblivion of a good night’s sleep? The sad reality, however, is that a decent slumber is increasingly hard to come by. The average adult sleeps an hour and a half less now compared with more than a century ago, thanks to the Internet, e-mail, cell phones and 24-hour entertainment that all take bites out of the sleep cycle. If you need incentive to put some of those hours back into it, consider this: the amount of sleep you get may endanger your life. That’s the conclusion reached by a new study conducted in Britain at University College London Medical School.
    Research has long documented that people may pay for shorter slumber with a shorter life span. Sleep is the body’s opportunity to rest and repair what the day has wrought, and if your heart is working at its 3 p.m. rate when the clock hits 3 a.m., it’s simply going to wear out faster. In the new study, epidemiologist Jane Ferrie questioned 7,700 British civil servants about their sleep habits over an eight-year period and found that those who slept six to eight hours nightly at the beginning of the study but decreased the amount of rest they got by the end of it increased their risk of dying from heart disease 110%. "When you sleep, your blood pressure drops, your heart rate drops, and the heart doesn’t have to work as much," explains Dr. Lawrence Epstein, medical director of the Sleep Health Centers in Boston.
    The natural answer to getting too little sleep is to sleep more—perhaps a lot more. But hold on. Ferrie found that short sleepers who slept each night for five hours or less did indeed decrease their overall risk of dying within eight years when they snagged two to three more hours of sleep a night by the end of the study. But once they started piling up too much sleep, crossing the line to nine hours or more daily, the risk of dying—not from heart disease but from other causes—rises the same 110%. Too few subjects in Feme’s study fell into this category for her to offer explanations of the findings, but others will undoubtedly investigate how excessive sleep can contribute to health problems.
Which of the following is NOT true according to the text?
选项 A、Body doesn’t work as much in the sleep as in the day time.
B、Seven or eight hours of sleep is comparably good to people’s health.
C、Enough evidence has shown that excessive sleep leads to health problems as well.
D、The study chose people working in government sectors as subjects.
答案C
解析 属事实细节题。选项A的内容出现在第二段最后，睡觉的时候人的血压和心率都下降，身体放松下来，不像白天负荷那样大，故不符合题意。选项B的内容通过阅读第二段和第三段可以得出，故不符合题意。第二段中讲到这项研究选取了7700名公务员作为研究对象，故选项D不合题意。文章最后一句指出，这项研究并未收集到足够的数据证明睡眠过多的危害，故选项C符合题意。
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