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词 数:404rn阅读难度:★★★☆☆rn建议阅读时间:5分种rnMiddle-aged people are being urged to walk faster to help stay healthy,amid concern high levels of inactivity may be harming their health.Officials at Public Health England said the amount of activity people did starts to tail off from the age of 40.They are urging those between the ages of 40 and 60 to start doing regular brisk walks.