【正确答案】 A

【答案解析】[听力原文]
   M: Mrs. Hudson, new research shows that even just five minutes of exercise in a natural setting can significantly boost our mood. But, is it true that can have such a magical effect?
   W: To a certain degree, I have to say yes. Because exercising in natural areas is not only good for our physical health—it can also improve the mood and sense of well-being in as little as five minutes.
   M: So if we go for a walk in a park or work in a garden, we're giving our mental health a good boost. But how was the result discovered?
   W: Before this, exercise alone was known to make us happy. So was being in a natural setting. Scientists wanted to see the effect of combining the two.
   M: So what did they do?
   W: They evaluated ten different UK studies involving more than 1200 people. Participants had taken part in activities such as gardening, sailing and country walks, and rated their mood and self-esteem.
   M: What did the scientists find in the research?
   W: They found that in a natural setting even a few minutes' exercise can really promote the mood. The research showed that their mood and self-esteem got a significant boost with as little as five minutes of outdoor exercise. And people with mental disorders benefited the most.
   M: Wow, this is the first study to quantify the amount of time needed to get a positive effect. So, maybe, if you want to be happy, just head out for a walk in the park.
   What is the man's attitude towards the new research?