3．Spending time in nature has been known to positively impact mental health for some time now，but even greenery planted along a sidewalk line can be beneficial.
Mental health experts have long believed the health benefits of spending time in nature and there're many related studies.A team of German researchers studied the long-term connection between living in an urban area where there are fewer green spaces and levels of depression.To understand the impact of being near a green space-specifically，trees planted along neighborhood sidewalks-they examined data from 10，000 residents of Leipzig，the most populated city in Saxony，Germany.Researchers assessed the number and type of street trees，how close they were planted to homes，and the number of drugs residents take to treat depression.
In addition to their closeness to green spaces，researchers also took into account the age，employment status，gender，and body weight of each of the participants.They found that trees located within 100 meters of the home were associated with a lower risk of being given antidepressants（抗抑郁藥），particularly in poor or unimportant neighborhoods.As these populations are usually at a greater risk of being given antidepressants in Germany，the findings prove just how beneficial green spaces in urban areas can be for improving mental health.
"Our findings suggest that street trees-a publicly accessible form of urban green spaces taking up a small area-can help close the gap in health inequalities between economically different social groups，" says Dr.Melissa Marselle，lead author of the study. "This is good news because street trees are relatively easy to achieve and their number can be increased without much planning effort."
In addition to the mental health benefits for humans，planting more trees is also good for the environment. "Adding street trees in residential urban areas is a nature-based solution that may not only promote mental health，but also contribute to biodiversity conservation and
mitigating climate change，says senior author Professor Aletta Bonn.
（1）How did the German team obtain their findings？
A．By conducting experiments.
B．By carrying out an analysis.
C．By referring to previous studies.
D．By interviewing 10，000 residents.
（2）What did the researchers find？
A．Spending time in nature has health benefits.
B．Green spaces have different effects on people.
C．People in poor areas suffer depression more easily.
D．Trees close to homes may reduce the risk of depression.
（3）What does the underlined word "mitigating" in the last paragraph probably mean？
A．Wiping.
B．Easing.
C．Understanding.
D．Monitoring.
（4）Why does the author write this text？
A．To give tips on planting trees.
B．To report a discovery in medicine.
C．To present the findings of a study.
D．To share a way to fight depression.
