题目

You can’t buy happiness but it looks like you can at least inherit(遗传)it，British and Australian researchers said on Thursday． A study of nearly l,000 pairs of identical and non—identical twins found genes control half the personality traits(特性) that make people happy while factors such as relationships, health, and careers are responsible for the rest of our well-being．  “We found that around half the differences in happiness were genetic,” said Tim Bates, a research at the University of Edinburgh who led the study．“It is really quite surprising．” The researchers计算：42-32=______．