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  3. Who says your job leaves you no time to hit the gym? A detailed new study of U. S. physical activity patterns shows that men who

Who says your job leaves you no time to hit the gym? A detailed new study of U. S. physical activity patterns shows that men who

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问题     Who says your job leaves you no time to hit the gym? A detailed new study of U. S. physical activity patterns shows that men who work full-time—whether their jobs are active or sedentary— end up getting more exercise than healthy working-age men without a job.
    The new study comes from researchers at the National Institutes of Health (NIH). As part of the National Health and Nutrition Examination Survey in 2003, some 1,800 working-age adults were asked questions about their lifestyle and work habits, and, most importantly, they then agreed to wear an accelerometer—a device to measure their physical activity—over the course of several days.
    Those data from the accelerometers provide a rare opportunity to nail down how much activity the typical American actually does.
    They show that men or women who work in active jobs do more physical activity on weekdays than men or women working in sedentary jobs: that’s perhaps not surprising, but the NIH researchers suggest that it still matters because of an ongoing shift in the economy toward sedentary work.
    The more surprising finding is the one that compares full-time workers to people who don’t work. The study shows that men with full-time jobs do more physical activity than healthy men without jobs. ("Healthy men", in this case, were those men who said their primary reason for being out of work—was something other than health or disability. ) In fact, even sedentary full-time workers performed more weekday physical activity overall than the healthy non-workers.
    The results looked very different for women. Women in sedentary jobs did less physical activity on weekdays than their healthy non-working peers.
    So what drives the gender (性别) difference? The study looks at the patterns, and unfortunately can’t provide too much detail about their causes. There could be many possible answers, including, perhaps, different abilities to pay for leisure time activities or different attitudes about work and physical activity. It could also be that more non-working women than men are choosing to be at home running around full-time after the kids.
    But the NHK researchers do find evidence, they write, to suggest that, whatever causes the difference, healthy non-working women "are replacing work with active pursuits whereas" —for some reason— "non-working men generally are not. "
The study tries to identify______.
选项 A、the ongoing economy trend
B、evidence for gender differences
C、the American physical activity patterns
D、the relation between work and leisure
答案B
解析 细节题。文章倒数第二段给出了调研的结论：不同性别，参与运动的程度也有差异，只是这项研究没有提供太多细节来解释导致这种状况的原因。故答案为B(该研究是为了确定性别之间有差异)。
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