The researchers found that friends of happy people had a greater chance of being happy themselves.That means that happiness spreads,or has a contagious effect,among people.And,the smaller the physical distance between friends,the larger the effect they had on each other’s happiness.For example,a person was twenty percent more likely to feel happy if his/her friend living within one and a half kilometers was also happy.Having a happy neighbor who lived next door increased an individual’s chance of being happy by thirty-four percent.The effects of friends’ happiness lasted for up to a year.

　　Another finding was that people who worked together or were married did not have as much of an effect on happiness levels as friends did.The researchers said this was often true among friends of the same sex.

　　A report on the findings was published this month in the BritishMedicalJournal.America’s National Institute on Aging helped to pay for the study.Some researchers who were not involved with the study questioned its findings.They said the results could be disputed(争议) unless a separate study showed similar findings.

　　【语篇导读】这是一篇说明文。本文主要向我们介绍了两位科学家的一项研究发现——快乐可以感染人,拥有快乐的朋友就会拥有快乐。

　　What does this text mainly tell us?

　　A.How to live a happy life.

　　B.One’s happiness influences others.

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