C As the days get shorter and the chilly weather rolls in , we all want to curl up in a blanket and hibernate until spring rolls around.But making time to get outside in the sun , even when it's cold out , could have bigger mental benefits than you might realize. While the link between sunshine and mental health is nothing new , new research from Brigham Young University (BYU) has shown that the association may be even stronger than previously realized.It finds that sunlight exposure is by far the greatest weather­related factor determining mental health outcomes.In other words : more sunshine , more happiness. For the study , a psychologist , a physicist and a statistician from BYU teamed up to compare daily environmental data from the university's Physics and Astronomy Weather Station with emotional health data archived by day for 16,452 adult therapy patients who were being treated at the BYU Counseling and Psychological Services Center. Exposure to sunlight is a significant factor in seasonal affective disorder.Research has shown that the brain produces more of the feel­good neurotransmitter serotonin on sunny days than it does on darker days.What's more , lack of sunlight is linked with lower vitamin D levels , which in turn has been related with depression and low energy. If you're getting enough sun , your emotions should remain relatively stable , the researchers found.But as the amount of sunlight in the day is reduced , levels of emotional pain can soar . Other weather variables including temperature , pollution and rain were not found to have an impact on mental health. “ We were surprised that many of the weather and pollution variables we included in the study were not significantly related with clients' scores on the emotional pain measure once we had accounted for suntime ,” Dr Mark Beeeher , a professor of psychology at the university and the study's lead author , said. “ People tend to associate rainy days , pollution , and other meteorological phenomena with sadness or depression , but we did not find that. ” 28 . What does the author suggest we do in Paragraph 1? A . Realize the benefits of sunshine. B . Avoid hibernating in springtime. C . Curl up in a blanket in cold weather. D . Enjoy sunshine even in cold weather. 29 . The underlined word “soar” in Paragraph 5 most probably means “________” . A . rise sharply B . vary unstably C . drop slightly D . change greatly 30 . What does the passage say about the research done by BYU? A . It is done on normal adults of various ages. B . It is carried out by Dr Mark Beecher alone. C . It concludes that sunshine means happiness. D . It finds that temperature affects mental health. 31 . What can be inferred from the passage? A . Lower vitamin D levels are helpful in keeping us energetic. B . The research findings are inconsistent with the popular belief. C . The more sunshine we get , the less excited we are likely to feel. D . The link between sunshine and mental health was unknown before.