When it comes to figuring out the link between well-being and access to nature,there are big confusing factors.To begin with,what is psychological（心理的）well-being？The World Health Organization defines（下定义）mental health as "a state of well-being in which an individual realizes his or her own abilities,can deal with the normal stresses of life,can work productively and is able to make a contribution to his or her community".That is hard to quantify.
Then there is the question of what "access to nature" means.Some studies measure passive access,or how much green space is available in someone's local area.Others look at active access,which is the actual exposure a person gets to green space.That makes it difficult to compare results and build a coherent（协调的）picture.
A few researchers have tried to assess what the proper dose（剂量）of nature might be.A 2019 study involving almost 20，000 participants in England concluded that at least 120 minutes a week of recreational（消遣的）nature contact was connected with good health or well-being.The team,led by Mathew White,found that the effect peaks at between 200 and 300 minutes a week,with people reporting no further gain after that.
What exactly this means for you-or any individual-is unclear.As other studies indicate,the mental health benefits a person gets from access to nature are likely to be influenced by many factors,including age,gender,personality features,personal preferences and socio-economic status.Your culture matters too-and,so far,most research into the well-being effects of nature has been done in Western societies.



Which of the following might mean mental health according to WHO？ ______

A. Ignoring ones' own abilities.
B. Complaining about stresses.
C. Communicating effectively.
D. Having high productivity.

How long should people stay close to nature every week to gain the most？ ______

A. 50 minutes.
B. 150 minutes.
C. 250 minutes.
D. 350 minutes.

Why does the author feel uncertain about the finding？ ______

A. Studies haven't provided any results so far.
B. Studies haven't considered all the factors.
C. Studies were only done in Western societies.
D. Studies have misled the public over the results.

What can be a suitable title for the text？ ______

A. Why does nature affect health？
B. Who does nature influence？
C. How much nature do I need？
D. How does nature benefit people？