单项选择题

You can’t buy happiness. However, it looks (1) you can at least inherit it, British and Australian researchers said.
A study of nearly 1,000 (2) of identical and non-identical twins found genes (3) half the personality traits that make people happy (4) factors such as relationships, health and careers are responsible for the rest of our well-being. "We found that around haft the (5) in happiness were genetic," said Tim Bates, a researcher at the University of Edinburgh who led the study. "It is really quite (6) ." The researchers asked the volunteers— (7) in age from 25 to 75—a series of questions about their personality, how they worried and how satisfied they were (8) their lives. Because identical twins share the (9) genes and non-identical twins do not, the researchers could identify common genes that (10) certain personality traits and predispose people to happiness.
People who are sociable, active, stable, hardworking and conscientious (11) to be happier, the researchers reported in the journal Psychological Science. " What this study showed was (12) the identical twins in a family were very similar in personality and in well-being, and (13) , the non-identical twins were only around half as similar," Bates said. "That strongly (14) genes. " The (15) are an important piece of the puzzle for researchers (16) to better understand depression and (17) makes different people happy or unhappy, Bates said. People with positive inherited personality traits may, in effect, also have a reserve of happiness to (18) in stressful times, he said.
"An important implication is that personality traits of being (19) , calm and reliable provide a resource, we called it ’affective reserve’, that (20) future happiness" Bates said.

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