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  3. Global life expectancy averages out to 71.4 years. That means, of course, that some parts of the world see much shorter life spa

Global life expectancy averages out to 71.4 years. That means, of course, that some parts of the world see much shorter life spa

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问题 Global life expectancy averages out to 71.4 years. That means, of course, that some parts of the world see much shorter life spans, while others enjoy far greater longevity. Five places, in particular, fall into the latter category. They’re known as Blue Zones—named for the blue circles researchers drew to identify the first one on a map—and they’re home to some of the oldest and healthiest people in the world. Dan Buettner, author of The Blue Zones and The Blue Zones Solution, told TIME why residents of these places live so long—and how you can steal their habits.
SARDINIA, ITALY
A largely plant-based diet, daily physical activity and familial closeness have given this Blue Zone the highest concentration of male centenarians in the world. (Sheep herders, who tend to walk at least five miles a day, and men with daughters, who may get especially tender care as they age, live even longer than most in this area.) It also doesn’t hurt that the M26 marker, a genetic variant linked to extreme longevity, has been passed down through generations in this secluded community.
OKINAWA, JAPAN
Many Blue Zones emphasize family and community, but bonding reaches its peak in this Japanese culture. Okinawans are supported by their moai, a small but tight-knit social circle meant to be there through all of life’ s ups and downs, which provides social support strong enough to dull mental stressors and reinforce shared healthy behaviors. The result? A culture that boasts the longest-living women in the world, with many surpassing 100.
NICOYA, COSTA RICA
Most Blue Zone residents avoid processed food, but Nicoyans take it to another level. The Costa Rican people traditionally get the majority of their caloric intake from beans, squash and corn, plus tropical fruits. This plant-forward, nutrient-dense diet—and plenty of time outdoors—makes for strong, well-nourished bodies. Meanwhile, a plan devida, or guiding life purpose, helps Nicoyans stay mentally and spiritually fulfilled to age 90 and beyond.
LOMA LINDA, CALIF., USA
The U.S. ’s only Blue Zone is a haven for the Seventh-day Adventist Church, a Protestant denomination. A shared set of principles, emphasis on community and adherence to the Sabbath—a day of rest, reflection and recharging—Many avoid meat and eat plenty of plants, whole grains and nuts help Loma Linda Adventists live 10 years longer than their fellow Americans.
IKARIA, GREECE
A fierce sense of island pride keeps Ikarians invested in their community. That, combined with late bedtimes offset by daily naps and a strict adherence to the Mediterranean diet—eating lots of fruits, vegetables, beans, whole grains, potatoes and olive oil—propels 1 in 3 Ikarians to live into their 90s, often free of dementia and chronic disease.
Which of the following is not true of the M26 marker mentioned in the passage?
选项 A、It can pass down through generations.
B、It is a genetic variant.
C、It is related to longevity.
D、It is used for an experiment.
答案D
解析 细节题。题干大意为：下面哪项不适用于M26 marker?根据题干关键词M26 marker定位到文章的第二段，这里介绍了M26标记是一种与特别长寿有关的遗传变异，已经在这个与世无争的社区遗传了好几代人了。A项意为“它能够代代遗传”，B项意为“它是一种基因变异”，C项意为“它与长寿有关”，D项意为“它能被用于实验”。结合原文，这里的D项并未提及。题干要求选出无关的一项，四个选项中只有D项是无关项。故选D。
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