Cities around the world are working to protect their urban forests．Some urhanforests are parks，and sonle are j ust streets with alot of trees．But all urban forests have many goodeffects on the environment．__________ (47)They alsostop the noise from heavy traffic．They even make theweather better because they make the air 3--5 degrees cooler，and they stop strong winds．

Urban forests also have many good effects on people．They makethe city more beautiful．In a crowded area，they give people a place to relax and spend time in nature．__________ (48)

In some countries，people are starting new urban forests．In England，there are now 1．3 million trees in an urban forest called Thames Chase，east of London．It was started in 1990，and it has grown very fast．Walking andbicycle clubs use the forest，and there are programs forchildren and artists．__________ (49)

Some older cities dont have space for a big urban forest，but plantingtrees on the streets makes the city better．Scientistsfound that commuters(通勤人员)feel more relaxed when theycan see trees．

Trees are even good for business．__________ (50)In the future，urban forests will become even more important as our cities growbigger．In the megacities(超大城市)oftomorrow，people will need more green space to live acomfortable life．Planting trees today will make ourlives better in the future．

A．People spend more time at shopping centers thathave trees．

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