2. 外语
  3. Many of us sit in front of a computer for eight hours a day, and then go home and head for the couch to surf the Web or watch te

Many of us sit in front of a computer for eight hours a day, and then go home and head for the couch to surf the Web or watch te

admin2012-02-29  22
问题     Many of us sit in front of a computer for eight hours a day, and then go home and head for the couch to surf the Web or watch television, exchanging one seat and screen for another. Even if we try to squeeze in an hour at the gym, is it enough to counteract (抵消) all that motionless sitting?
    A mounting body of evidence suggests not.
    Increasingly, research is focusing not on how much exercise people get, but how much of their time is spent in sedentary (久坐的) activity, and the harm that does.
    The latest findings, published this week in The Journal of the American College of Cardiology, indicate that the amount of leisure time spent sitting in front of a screen can have such an overwhelming, seemingly irreparable (无法弥补的) impact on one’s health that physical activity doesn’t produce much benefit.
    The study followed 4,512 middle-aged Scottish men for a little more than four years on average. It found that those who said they spent two or more leisure hours a day sitting in front of a screen were at double the risk of a heart attack or other heart events compared with those who watched less. Those who spent four or more hours of recreational time in front of a screen were 50 percent more likely to die of any cause. It didn’t matter whether the men were physically active for several hours a week — exercise didn’t reduce the risk associated with the high amount of sedentary screen time.
    The study is not the first to suggest that sedentary activities like television viewing may be harmful. A 2009 study reported that young children who watch one and a half to five and a half hours of TV a day have higher blood pressure readings than those who watch less than half an hour, even if they are thin and physically active.
    Recreational screen time has an "independent, injurious relationship" with heart and the blood vessels events and death of all causes, the paper concluded, possibly because it induces metabolic (新陈代谢) changes.
    The study focused on recreational screen time because it’s the easiest to reduce, Dr. Stamatakis said. But he encouraged employees who work at computers all day to get up and take breaks and short walks periodically.
A 2009 study supported the idea that______.
选项 A、physical inactivity may do harm to people’s health
B、the length of time spent in taking exercises do matter
C、television viewers are more likely to die of heart diseases
D、thin teenagers are immune to disease caused by watching TV
答案A
解析 根据题干中的A 2009 study将本题出处定位到第六段第二句。该句介绍了2009的一项研究：每天看一个半小时到五个半小时电视的儿童的血压值比每天看电视少于半小时的儿童要高，即便前者很瘦而且经常运动。由此可知，2009年的研究也表明了久坐不动可能会对健康有危害，故答案为[A]。[C]不是2009年研究得出的结论，故排除；根据even if they are thin andphysically active可排除[B]和[D]。
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