单项选择题

In an analysis of reports from 42 countries, U.S. researchers found that married people are consistently happier than singletons. The effect is small, but that still begs the question: Does marriage make you happy, or are happy people simply more likely to get married
Both answers may be true .In a study that followed more 30, 000 Germans for 15 years, Diener and his colleagues found that happy people are more likely to get married and then stay married. But anyone can improve his or her mood by getting married. The effect begins about a year before the : "happy day "and lasts for at least a year afterward .For most people, satisfaction levels do return to their baseline, but the researchers say this conceals(掩盖) the fact that a good marriage can have a permanent positive effect. Furthermore, people who are less happy to begin with will get a bigger boost from marriage.
And it seems there’s something special about signing that piece of paper：The research shows that you can’t get as much benefit from simply cohabiting (同居)。"My husband says that cohabiting couples lack the deeper security that comes with the formal band of gold, and that is why they are not quite so happy , "says Oswald."Insecurity, we know from all data , is bad for human beings.\

According to the passage, what will do harm to humans beings（）

点击查看答案