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

admin2012-05-17  52
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.
What do we learn from the study published in The Journal of the American College of Cardiology？
选项 A、The more people watch TV, the healthier they will become.
B、The amount of exercises people get should be taken seriously.
C、The harm done by sedentary activities seems impossible to repair.
D、Exercise can make up for damage caused by high amount of sitting time.
答案C
解析 根据题干中的The Journal…Cardiolog)，将本题出处定位到第四段。该段提到了刊登在<美国心脏病学会杂志》的研究结果：坐在屏幕前的休闲娱乐时间对于一个人的身体具有如此巨大且看似无可挽回的影响，以至于体育锻炼带来不了什么益处。由此可知，久坐不动对健康造成的伤害看似无法修复，故答案为[C]。[A]与原文意思相反，故排除；[B]与第五段末句提到的It didn’t matter whether…physically active for several hours…矛盾；[D]与irreparable impact…that physical activity doesn’t produce much benefit矛盾，故排除。
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