Ⅳ.根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项多余选项。
__1__ Researchers from Harvard University and the University of California, San Diego, have found an answer as part of a study.
Nicholas Christakis and James Fowler based the study on the emotional health of almost five thousand people. They used information gathered over a period of twenty years, until 2008, in the Framingham Heart Study. __2__
The new study found that friends of happy people had a greater chance of being happy themselves. 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 a 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.
The researchers found that happiness really is contagious (感染性的). __3__
People removed by as much as three degrees of separation still had an effect on a person's happiness. __4__
The study showed that having an extra five thousand dollars increased a person's chances of becoming happier by about two percent. But the researchers found that the influence of a friend of a friend of a friend can be greater than that.
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