In today's lecture, we'll discuss the impact of urban green spaces on mental health. Recent studies show that even small parks in city centers can significantly reduce stress levels among residents. Dr. Emily Carter from the University of London conducted a two-year experiment involving 500 participants. She found that people who visited a green area at least three times a week reported a 20% decrease in cortisol, a stress hormone. Interestingly, the size of the green space mattered less than the frequency of visits. However, she noted that noise pollution from nearby traffic could undermine these benefits, so planners should consider buffer zones of trees or shrubs.
❓ 根据讲座内容，艾米丽·卡特博士的研究对城市绿地有何发现？
A. A. 大型公园在缓解压力方面总是比小型公园更有效。
B. B. 经常探访绿色区域，即便是小型的，也能降低压力荷尔蒙水平。
C. C. 减轻压力的主要因素是家到公园的距离。
D. D. 交通噪音对绿色空间的心理健康益处没有影响。
✅ 正确答案
B. Visiting green areas frequently, even small ones, can lower stress hormone levels.