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Passage (Questions 96-100)
Urban parks are often described as the lungs of a city. Trees filter dust, lower temperatures during summer and give residents a place to exercise and relax. Studies in several countries link access to green space with lower stress and better mental health. Yet land in cities is expensive, and green areas are often the first to be sacrificed when roads or buildings are planned. Planners are therefore experimenting with rooftop gardens, vertical walls of plants and small 'pocket parks' on unused corners of land. These solutions do not replace large parks, but they can bring a little nature within walking distance of every home.
According to the passage, which of the following do trees in urban parks do?
- ARaise summer temperatures
- BIncrease the price of land
- CReduce the need for exercise
- DFilter dust and lower temperatures during summer
Correct answer: D