题目

     Pet owners are being encouraged to take their animals to work, a move scientists say can be good for productivity, workplace morale (士气)，and the well-being of animals.      A study found that 25% of Australian women would like to keep an office pet. Sue Chaseling of Petcare Information Service said the practice of keeping office pets was good both for the people and the pets. “On the pets’ side, they are not left on their own and won’t feel lonely and unhappy,” she said. A study of major US companies showed that 73% found office pets beneficial (有益的), while 27%若一次函数y=kx+（k-1）的图象经过第一、二、三象限，则k的取值范围是________．