As the vegetation requires a water supply, there is a inbuilt water preservation layer in the green roof system. This layer helps to keep the rainwater. It makes full use of the rainwater and prevents wastage. During heavy rains, the water runs off the flat roof. The green roof prevents this overflow by slowing down the volume of running water.

　　Green roofs can compensate for the lost greenery in urban areas and increase the artistic value of an area. Your building will look beautiful, coated with green vegetation. Green roofs can serve as local community garden and create a natural atmosphere, giving physical and psychological benefits like reducing stress levels in people and keeping them physically fit. Besides, people can start their own small-scale cultivation (栽培)and experience the pleasure

　　of gardening.

　　32．What do we know about a green roof?

　　A. It is painted green for a specific purpose

　　B. It uses solar energy to produce electricity

　　C. it is designed for kids to enjoy themselves

　　D. it is covered with grass, flowers or other plants

　　33．Mr. Black who owns two buildings is interested in the green roofing system probably because_____.

　　A. it can solve the problem of air pollution

　　B. it produces more energy to power the buildings

　　C. it creates natural habitats for birds and insects

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