【解析】主旨大意题。综合全文可知，文章介绍“团队锻炼在健身中的积极作用”，因此B项“辅助性的健康(运动)”概括得最全面。

　　B

　　(2016湖南师大附中高三上学期第三次月考，D)

　　One in five people carry a ‘smart gene’ variant(变体)linked to long lifespan, bigger forebrain and enhanced mental ability, researchers have found.

　　“We've known for a long time that people lose cognitive(认知) abilities as they age, but now we're beginning to understand that factors like KLOTHO can give people a boost in aging.Genetic variation in KLOTHO could help us predict brain health and find ways to protect people from the diseases that happen to us as we grow old, like Alzheimer's disease(老年痴呆症)，” said senior author, Dena Dubal of University of California.

　　The KLOTHO gene affects a protein found in the kidneys and the brain that regulates many different body processes.About one in five people carry a single copy of the varian, known as KL­VS，which boosts levels of the protein and is associated with a longer lifespan and improved heart and kidney function.A small minority, 3% of the population, has two copies, which is linked to a shorter lifespan.

　　In the new study scientists scanned the brains of 422 men and women aged 53 and over who were also tested for the KLOTHO gene.They found that participants with a single copy of the gene variant also had a larger brain region known as RDLPFC, which is especially likely to shrink with age.Loss of neurons in this area may be one reason why older people are sometimes easily distracted and find it difficult to do more than one task at the same time.

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