Passage One Questions 46 to 50 are based on the followingpassage. Living in an urban area with green spaces has along-lasting positive impact on people's mentalwell-being, a study has suggested. UK researchersfound moving to a green space had a sustained positive effect, unlike pay rises or promotions, which only provided a short-term boost. Co-author Mathew White, from the University ofExeter, UK, explained that the study showed people living in greener urban areas weredisplaying fewer signs of depression or anxiety. "There could be a number of reasons," hesaid, "for example, people do many things to make themselves happier: they strive forpromotion or pay rises, or they get married. But the trouble with those things is that withinsix months to a year, people are back to their original baseline levels of well-being. So, thesethings are not sustainable; they don't make us happy in the long term. We found that for somelottery (彩票) winners who had won more than £500,000 the positive effect was definitelythere, but after six months to a year, they were back to the baseline." Dr. White said his team wanted to see whether living in greener urban areas had a lastingpositive effect on people's sense of well-being or whether the effect also disappeared after aperiod of time. To do this, the team used data from the British Household Panel Surveycompiled by the University of Essex. Explaining what the data revealed, he said: "What you see is that even after three years, mental health is still better, which is unlike many other things that we think will make ushappy." He observed that people living in green spaces were less stressed, and less stressedpeople made more sensible decisions and communicated better. With a growing body of evidence establishing a link between urban green spaces and apositive impact on human well-being, Dr. White said, "There's growing interest among publicpolicy officials, but the trouble is who funds it. What we really need at a policy level is to decidewhere the money will come from to help support good quality local green spaces." 1According to one study, what do green spaces do to people?
A、Improve their work efficiency.
B、Add to their sustained happiness.
C、Help them build a positive attitude towards life.
D、Lessen their concerns about material well-being.