【答案解析】

46. 根据题干中的定位名词study和green spaces回文快速定位到文章中的第一段，根据第一段的信息可得出UK researchers found moving to a green space had a sustained positive effect（英国研究者发现搬到绿色小区可以带来持久的积极影响）。以及“people living in greener urban areas were displaying fewer signs of depression or anxiety（生活在绿色小区的人们较少表现出抑郁或焦虑的情绪）”这两处信息可以确定本题的正确选项是B （Add to their sustained happiness）。

47. 本题根据题干定位词Dr. White 及usually do定位到本篇文章中的第一段"There could be a number of reasons,” he said, “for example, people do many things to make themselves happier: they strive for promotion or pay rises, or they get married.处，根据本句信息，可推出人们通常让自己快乐的事是挣更多的钱，因此本题的正确选项为A（Earn more money.）。

48. 由第一段可知“升值、加薪、中彩票只会给人们带来短期的快乐，这种快乐在过了六个月到一年后就会消失”，第二段首句“Dr. White said his team wanted to see whether living in greener urban areas had a lasting positive effect on people's sense of well-being or whether the effect also disappeared after a period of time.”进一步承接第一段说明Dr. White的研究目的是要知道居住在绿色环境中给人带来的积极影响可以持续多久。故本题正确选项为C选项（How long its positive effect lasts.）。

49. 根据题干信息可以将本题定位至第三段，在最后一句话中，“He observed that people living in green spaces were less stressed, and less stressed people made more sensible decisions and communicated better.”由最后的communicate better 可以得出本题的正确选项为D （Their communication with others improved.）。

50. 根据本题题干给出的信息，根据定位词Dr. White 和government，可定位至最后一段，提到我们需要资金来建立一个高质量的绿色社区，从最后一段的最后一句话“what we really need at a policy level is to decide where the money is going to come from to help support good quality local green spaces.”可得出本题的正确选项为A（Find financial support.）。

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