A、Doubtful. B、Supportive. C、Indifferent. D、Objective. A

M: Mrs. Hudson, new research shows that even just five minutes of exercise in a natural setting can significantly boost our mood. (1)But, is it true that can have such a magical effect?
W: To a certain degree, I have to say yes. Because (2)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: (3)They evaluated ten different UK studies involving more than 1 200 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. (4)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.
Questions 1 to 4 are based on the conversation you have just heard.
1. What is the man’s attitude towards the new research?
2. What is the positive effect of exercising in natural areas?
3. How did the scientists find these results?
4. What can we learn from the research?