Exercising for just 10 minutes a week is linked to a longer life

　　Exercising for just 10 minutes a week is linked to a longer life, according to a new study published in The British Journal of Sports Medicine.

　　Several recent studies have found that even low-intensity exercise, done for a short amount of time, can have a meaningful ___26___ on health. Still, the idea that exercising for just 10 minutes a week may be enough to increase your lifespan is novel. It's also somewhat ___27___, since the federal physical activity guidelines recommend getting at least 75 minutes of vigorous exercise or 150 minutes of ___28___ exercise each week.

　　The study was based on data from more than 88,000 U.S. adults who ___29___ in the National Health Interview Survey between 1997 and 2008.

　　Contrary to some research that has found an ___30___ limit to the amount of exercise that is healthy, the researchers found that there was ___31___ no limit to the longevity (长寿) benefits of exercise. Even the small group of people who got 10 times the amount of exercise recommended by the federal government had a

　　46% lower ___32___ of death than the least active group.

　　Still, observational studies like this one cannot prove cause and effect; they can only find ___33___. The researchers also were not able to ___34___ for certain lifestyle factors that could affect lifespan, including dietary habits and changes in physical activity over time. Despite these ___35___, the study's results are yet another indication of the power of physical activity, even in small amounts.

　　答案&解析

　　26.F)impact

　　27.D)controversial

　　28.H)moderate

　　29.D participated

　　30.O)upper

　　31.M)seemingly

　　32.L)risk

　　33.J)patterns

　　34.A)adjust

　　35.G)limitations

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