(单选题)

What is the passage mainly about? ( )

A.The influence of pollution on mental health.

B.The importance of nature to mental well being.

C.The increasingly fast urbanization process.

D.The benefits of doing outdoor activities.

参考答案：B

参考解析：

根据首尾原则，第一段......But are they putting themselves at risk? Maybe. Experts say that "natural environments or green spaces" do much for our good mental health.可知虽然在城市生活能够给人们更好的工作和文化活动。但是，专家认为自然环境有利于人们的心理健康。文章主要是说城市生活给现代人类带来心理压力，自然环境对人类心理有利的好处，B项抓准了关键词和文章主旨。故本题正确答案选B。

知识点：主旨题英语阅读理解通用英语